Aroma ARC-1000A Manuel d'utilisateur

tubes age 1TUBE ROTATION AND REPLACEMENTThe R-390A Frequently Asked Questions Page Tubes (Valves)Send Comments to the FAQ-Meister, WAØHQQ:(r390a-

tubes age 10About the least trouble that I've had is the 6 or 7 dozen or so tubes in the oldTektronix scope and the CA plugin that's usually

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tubes age 101RE: http://www.ee.ualberta.ca/~schmaus/elect/tdex.htmlI have finally found software designed to inventory vacuum tubes. not only that, it

tubes age 102I replaced my HP-410B a while ago with a much later one... I had a spare 2-01C probe for the ood one but my newer one needed a EA53. I

tubes age 103Date: Thu, 9 May 2002 08:49:54 EDTSubject: [R-390] 3TF7 Failed in serviceContrary to observations made from time to time by others on the

tubes age 104think a heat dissipating tube shield uses less headroom than a spring loadedshiny one.---------------------------------------------------

tubes age 105Date: Sat, 25 May 2002 09:15:48 -0700From: Craig McCartney <[email protected]>Subject: RE: [R-390] New (to me) R-390ABarry, Here

tubes age 106From: Andy Williams <[email protected]>Subject: RE: [R-390] Tube List For R-390 (non A)I have a list of tubes & IERC tube

tubes age 10712AU7 12AU7 <--- OK to use pairs of 5814As.RT512 V508 V7013TF7 5749 5749V601 V60212AU7 12AT7V603 V604 V607 V5096AK6

tubes age 108There you have it. If someone says, "RYAN, GET A LIFE!" I'll delete him! :-)--------------------------------------------

tubes age 109Hi, Roy, Thanks for pointing out the discrepancy in my R-390 tube list of 20June 2000 which I wrote for Paul Anderson (cited below). It

tubes age 11example. There's three of them in there if I remember right. Two on the audiodeck and one on the IF deck. The one used as the 4th IF

tubes age 110------------------------------------------------------------------------------------------------------------From: "Bill Smith"

tubes age 111horizontal sweep tube 'linear' amps from the late 60's and early 70's? Drive 'emhard, replace tubes daily. But t

tubes age 112can "catch up" on the technique for testing tubes. Or,... just ask morequestions here, they will come up as you get more int

tubes age 113Download a copy of the Y2K manual.Once the nasty caps have been done and the radio tweaked, put your tubes in abox in the closet and then

tubes age 1144. Keep the tube in long enough only to do the shorts test and then if OK, thequality test as long as it takes to get a stable, or good

tubes age 115Nah, handling is tough on boxes, etc. I'd test a good selection of spares forquick emergency changes or hot swaps but you'd ha

tubes age 116Subject: Re: [R-390] Tube testers and other babblingsDate: Sun, 18 Aug 2002 08:54:51 -0400Your B&K tester is a good middle quality mu

tubes age 117like that. There are several different styles of 5814a's. One auction has 3different types in it. I'm sure there is something

tubes age 118Subject: [R-390] Done to death, delete at will: 6DC6 surrogatesI picked the word "surrogate" with care. These are not substitu

tubes age 1196BA6, and 6BC5, and another pinout I forget which, which is like 7BK but with Kand G3 swapped.-------------------------------------------

tubes age 12paralleled a 35 mfd tantalum for the moderate fast changes, and then a 0.1monolithic for the really fast changes, and so can't detect

tubes age 120measure the temperature of the inside of the tube IF the glass used istransparent at IR AND you know the emissitivity of the thing you ar

tubes age 1212) Did they toss the tubes when they failed on a tube tester or failed in theradio?3) Do the tubes you use fail at the rate that the Navy

tubes age 122have much of an affect. The getter (hopefully ...) stays nice and cold through theprocess. By that I mean that you don't want it to

tubes age 123also how/why swapping tubes is still the only way to be certain. Even a goodtube tester can't give you the critical results that the

tubes age 124Thought this tip from Nolan would be of use to someone, somewhere, sometime...found it while searching for something else. Barry+

tubes age 125missing or altered serial numbers, electromagnetic radiation from nuclearblasts, sonic boom vibrations, customer adjustments that are not

tubes age 1266CB6A/6676 1.00 TRIGON (UK)6H6 2.00 JAN GE (metal)6K7 2.00 JAN GE (metal)6U

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tubes age 128BLOW OUT. This is because the filament filter cap has charged up to a highvoltage and will apply excessive voltage to the whole string

tubes age 129covering can usually be restored with some glue and .. black shoepolish. Justglue down the areas which have become loose. Any frayed or

tubes age 13Replacing 6AK6 needs more output voltage swing capability. Probably meansa cascade of a double gate MOSFET for voltage gain with a power M

tubes age 130Subject: [R-390] Another ConundrumIn the R-390 regulated power supply is a single 6BH6 tube. This is a pentodeused as a DC amplifier. It

tubes age 131silicon diodes. Also someone on the e-place is currently selling a complete setof tubes for the R-390A minus the 3TF7. Antique Electroni

tubes age 132----------------------------------------------------------------------------------------------------------From: "Scott, Barry (Clyde

tubes age 133------------------------------------------------------------------------------------------------------------Date: Thu, 4 Nov 2004 19:42:4

tubes age 134Subject: Re: [R-390] Tube life/replacement?We had a little thread going on this a while back. More or less to recap:1) There are no "

tubes age 135theoretically last a lifetime. Of course the thermal shock of switching them onand off may handicap the tube life way beyond 50%...maybe

tubes age 136http://www.geocities.com/CapeCanaveral/Hall/8701/Audio_BS.htmIt appears that the very latest craze is cryogenically soaking your tubes,co

tubes age 137more musical than others...I guess it's got to do with how the tube handlesharmonics, overtones and transients which music is full o

tubes age 138Date: Sun, 13 Mar 2005 12:06:08 ESTFrom: [email protected]: Re: [R-390] Tube Sub Question>I'm looking for a sub

tubes age 139have a large number of the 6189W tubes and a couple R-390A' that I need tokeep glowing!!!-------------------------------------------

tubes age 14Otherwise the common 1N914 like silicon switching diodes are too slow forgood RF detection. And that 0.6 volt conduction threshold (.2 in

tubes age 140same tube as the 6AK5 designed for low plate voltage. They indicate about thesame gm when tested according to the Hickok settings for 6A

tubes age 141Subject: Re: [R-390] R390 progressI sounds like Tom said Jerry said, the whole world knows you need some 6AK5/ 5749 in your R390. Not som

tubes age 142was some thinking that reducing the number of tube types might be importantbut I didn't see that mentioned. In the 390A, the desig

tubes age 143Date: Fri, 08 Jul 2005 21:15:59 -0400From: [email protected] (Tim Shoppa)Subject: [R-390] Ceramic sockets or not?My yellow

tubes age 144the audio stages, the VR tube and the rectifiers. They are not recommended forRF.Last of all are the flat "wafer sockets" made

tubes age 145an outfit called "The Triode Store" but I haven't looked at what else they havelately.------------------------------------

tubes age 146------------------------------------------------------------------------------------------------------Date: Sun, 7 Aug 2005 19:47:25 EDTF

tubes age 147when. Warming the tubes with a Zippo lighter will take the blue glow out. Thereason this works is, you heat the getter stuff and it gets

tubes age 148the getter material flashed upon the inside of the glass has turned brown ordiscolored. The shiny stuff has become glommed by sucking up

tubes age 149Roy's otherwise-excellent post unaccountably omits mention of oneparticularly-to-be-avoided form of glow in tubes. When a metal 6L6

tubes age 15selectivity, then the following IF amps are only for gain and gain control. Justbefore the detector its worth having another set of filter

tubes age 150When I killed an 807 in my Viking II (screen resistor failed, B+ spiked and therewas a flash from the getter to the metal it deposited on

tubes age 151----------------------------------------------------------------------------------------------------------Date: Thu, 27 Oct 2005 07:54:50

tubes age 152bfo. Most AC meters have a dB scale on them. Hit a few web pages and seehow to use your meters AC scale or dB scale. Exact numbers are no

tubes age 153I have looked for an official spec on the web but never found it, never did find itin a tube handbook either. Note that most PC mount tub

tubes age 154the Power supply rectifiers. If you do not have the 26Z5 tubes in the powersupply, turning off the plate voltage by switching to stand-b

tubes age 155noise ratio would stay above the required 10:1 noise level. Most receivers didmake the cut of 10:1 after six months use.>From this we

tubes age 156Subject: Re: [R-390] Black Marker on TubesFor high-power (transmitter, >20W) glass tubes there might be some issueshaving to do with d

tubes age 157This offered as a possible 'wives tale' solution and NOT from a scientificviewpoint. I'm hesitant to offer this, and I hop

tubes age 158I found the box marked 12AX7's (good news), what was in there was 20 nosmil pkg. RCA JRC 5651's (bad news). Sorry guys, I sh

tubes age 159Sorry about that I thought the 6082's were the regulators...didn't go look it up. Iknow they are the ones that generate all th

tubes age 16There's probably room for a couple henry choke over where the 26Z5s were.------------------------------------------------------------

tubes age 160OK, I finally remembered to get to the store for some tonic water to try and getthe heavily corroded tube pins cleaned off. I had bought

tubes age 161Subject: Re: [R-390] 6082 (and other) tubesIf you aren't in the tube business and don't want to go there, just post the name,ad

tubes age 162have invested in more than a few versions of the non-A, the A and others suchas two 389s, a 391 and two 392s. I want to make sure that th

tubes age 163I'm guessing from what little I could find that the CV is Russian or anothereastern block designation. I have had good luck with the

tubes age 164A website that seems to have a lot of Euro tubes in its index is athttp://tdsl.duncanamps.com/tubesearch.phpand if I poke around I see CV

tubes age 165----------------------------------------------------------------------------------------------------------Date: Sun, 29 Jan 2006 17:11:55

tubes age 166----------------------------------------------------------------------------------------------------------Date: Thu, 16 Feb 2006 18:26:15

tubes age 167overall). Well, looking through my R-390A's that probably never had anything butmil-spec JAN tubes in them their whole lives I see p

tubes age 168If the plate voltage is high (550 or so) in the Scout, you can expect the Chinesetubes to self destruct. Better get some advice from the

tubes age 169The "3D" in your copy of my old post is the tilde character, meaning"approximately". Most of those tubes can't b

tubes age 17that otherwise minor microphonics are far more noticeable as well as the lastIF stages being over driven. When an IF tube is used as the S

tubes age 170One tube sub I tested: 6AU6 for 6BA6. They are both 7BK base pentodes butthe 6BA6 is remote cutoff (more appropriate for AGC action) and

tubes age 171Since there are a multiplicity of gain-controlled stages, losing control in just onestage (as by sustituting a sharp cutoff tube for the

tubes age 172Date: Tue, 18 Apr 2006 23:29:18 -0400From: David Drew <[email protected]>Subject: [R-390] 6C4? 6C4W? 6C4WA?I could use guidance f

tubes age 173Those are "asking prices". I often see large lots of all three varieties going forless than $1 a tube. The military surplused l

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tubes age 175Date: Fri, 21 Apr 2006 12:29:39 -0400From: David Drew <[email protected]>Subject: [R-390] Re: 6C4? 6C4W? 6C4WA?Thanks for the adv

tubes age 176For better or worse my memories are a mix of the best of what I've seen, theworst of what I've seen, and what I wanted to see b

tubes age 177Subject: [R-390] 6C4 versus "W" and "WA"Since I needed to pull my R-390A for some other work, I decided to duplicate

tubes age 178And one obvious difference I've noticed between 6C4's: Their height! Sylvania6C4W's are the shortest, almost as small as t

tubes age 179in several stages. Pick from the tubes you have in hand the best one as ratedon signal to noise ratio. Put the best one forward in the ci

tubes age 18the seven 5814A's? Here is a way to help conserve our dwindling tubesupplies.If I get a real hot radio and the owner wishes to inves

tubes age 180Once you down to differences you cannot hear you can still measure smallerdifferences with test equipment and meters. Just look at all th

tubes age 181Gentleman Its a triode, it aint nothing more or less, on and on you go, I don'tcare what letters follow the number, its still a tri

tubes age 182From: [email protected]: Re: [R-390] Re: 6C4? 6C4W? 6C4WA?Yes, A lot of tubes get better with use. Or not as noisy. I do

tubes age 183repeatedly in the title and body that these are 6AK5W's/5749's. They do seem tomostly work when I stick them in and in fact the

tubes age 184though, that the pins themselves seem to have oxidized. Suggestions? Is theresomething I can use to gently clean the contacts in the tub

tubes age 185very close to shutoff, and with a strong signal, it will go into shutoff for thenegative-going part of the input waveform, resulting is a

tubes age 186 Im sitting here listening to a little military chit-chat and going through sometubes. Just when you thought you have seen them all, some

tubes age 187Date: Sat, 08 Jul 2006 21:47:05 -0400From: [email protected] (Tim Shoppa)Subject: Re: [R-390] 5814A/ 6C4 tube placement>

tubes age 188I have many of these (along with lots of other JAN 6BA6's/5749W's) I think and Ihave never really noticed microphonic problems.

tubes age 189Fellows have found tubes really very in performance. You may do a signal tonoise and swap in a different tube type and do a signal to noi

tubes age 19I measured each on a TV-7 tester, and got a wide range of results. I moved thebest one to V202, the second best to V203, and the worst to

tubes age 190>I need about 20 12AX7's for my R-388's and other equipment. Epay is>Is the Russian Double Triode Tube 6N2P-EV a legitim

tubes age 191From: [email protected]: [R-390] Tube organizing helpA common problem, but I could use some advice. I have several thousandtubes fo

tubes age 192----------------------------------------------------------------------------------------------------------Date: 4 Jan 2007 21:07:05 -0000

tubes age 193boxes, sorted by filament voltage and, if necessary, base type. So my receivingtube boxes go like this (each new line is one or more boxe

tubes age 194Good luck. 73, Don Merz, N3RHT----------------------------------------------------------------------------------------

tubes age 195Amazing, I almost have exactly what Roy does. My variations: duct tape foldedback on itself makes nice flat handles for the inside trays

tubes age 196Enough rambling, this must be a side effect of the codeine from the coughmeds the Dr. just cave me. Happy New Year All! John Flood------

tubes age 197From: Carole White-Connor <[email protected]>Subject: Re: [R-390] New Project (More Questions)Today, I redid the filter caps

tubes age 198can't see any obvious advantage. Just as a side point: I recently found out thatthe 5814A at one point a half century ago was specce

tubes age 199Hope this provides you some insight to getting the most use out of the tubesyou have in hand.--------------------------------------------

tubes age 2* Replace the 3TF7 with a diode that is rated to handle the voltage andcurrent. This creates a pulsing DC voltage of the proper value for t

tubes age 20Let's see what I have handy, here's a pair of Mullard EL-34's, in Mullard markedboxes, with the tubes marked as Mullard and

tubes age 200A variac would take care of that. Some radio's have various input taps on thepower transformer and one can set it for the highest v

tubes age 201filaments of the tubes. You would have likely noticed that - bright lights insidethe radio! If the radio is still playing OK, then the t

tubes age 202the power high for a 390? If you don't have a wattmeter, measure the B+voltages. Maybe the regulator failed high. IIRC, there are at

tubes age 203necessary. With the heat from fans on the 6082 series regulators in the R-390,the 6146 finals in the Invader, and the 200 watt filament

tubes age 204more stable at their design voltage than at 90 volts, but you are not going todamage the tubes. Best regards, Don------------------------

tubes age 205Date: Wed, 27 Jun 2007 21:06:23 -0400From: "Al Parker" <[email protected]>Subject: Re: [R-390] 12BE6Your subject says 12BE

tubes age 206separate tubes for the oscillator whereas I was looking at the 6BE6 as aconverter. However pin 7 is G3 (the grid that is responsible for

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tubes age 208old TV tubes!") but overall view them as fun and not a business :-). I'd like it ifNOS 5814A's and 12AX7's and 6L6GC&

tubes age 209eared audio crowd. When they're finally gone, I'll have to start using the Jan6922's but in the mean time, I'll cook

tubes age 21Date: Fri, 14 Jan 2000 19:38:23 -0600From: Nolan Lee <[email protected]>Subject: Re: [R-390] 5814A tubes>Dang! Thanks for the tub

tubes age 210Just for kicks, measure the sensitivity of your receiver, remove and label thetubes on the RF deck and replace them with new tubes. Then

tubes age 211sized cans with pull-tab tops. I still have many cans with mostly ceramics suchas the 4CX150/250 TYPES, 2C39'S, ETC.---------------

tubes age 212Date: Sat, 27 Dec 2008 23:46:16 -0500From: Roy Morgan <[email protected]>Subject: Re: [R-390] re: Chuck Rippel's parts kits(

tubes age 213electron drift. Current flow from anode to cathode is known as "conventionalcurrent" among these folks. By the way, do you kn

tubes age 214Jay KE6PPF-----------------------------------------------------------------------------------------------------Date: Sat, 21 Mar 2009 18:

tubes age 215set up the TV-10 as per the manual, and also followed Rogers "how to test"instructions.I tested four 6DC6 NOS JAN 12/86.The TV-

tubes age 216Date: Mon, 6 Apr 2009 08:44:33 -0700 (PDT)From: wli <[email protected]>Subject: Re: [R-390] TV-10 tube testing questionsNot unusua

tubes age 217From: Jon Schlegel <[email protected]>Subject: [R-390] Heater Dropping Resistor R536I'm working on the IF module from my

tubes age 218Subject: Re: [R-390] Heater Dropping Resistor R536When I've had hum from the IF module, it in fact was caused by heater-to-cathode l

tubes age 219Date: Thu, 6 Aug 2009 09:41:48 -0700 (PDT)From: John Flood <[email protected]>Subject: [R-390] Line audio output problem and 6C4 RF

tubes age 22Not all Westinghouse tubes had etched an number though. I've got a little 5654sized WE409A (6AS6) setting here that I just removed fr

tubes age 220These were GE tubes made in the last week of Nov. 1965.----------------------------------------------------------------------------------

tubes age 221are in such easy supply because of vast quantities of JAN tubes liquidated frommilitary stocks.After I got my 390A's, I went out on

tubes age 222Save the old tubes. If you have a couple that go noisy early, you swap and oldless noisy tube back in and put off doing a full refresh. I

tubes age 223them one at a time just do them all. Get it over with and start aging a whole newset of replacements.One of the Fellows asked about doing

tubes age 224Since we have discussed the effects of microphonic tubes before, I thought youguys would enjoy this one: http://broduke2000.livejournal.c

tubes age 2256AK5's are same base and in my experience work just fine. In a pinch most ofthe pentodes can be swapped around and you'll still

tubes age 226----------------------------------------------------------------------------------------------------------Date: Tue, 7 Sep 2010 13:12:49

tubes age 227 The least likely is a plate resistor or a cathode resistor that has vastlydecreased in value (although the plate resistor ma

tubes age 228The pair of 12AU7A's check quite strong on my Hickok 752A (they check aboutthe same uMho values as the 5814's). Is this just

tubes age 229- but even these are perfectly reliable with 5814s, IME), so there is absolutelyno reason for concern. Actually, you've had a second

tubes age 23I've had a lot of weird problems with 0A*, 0B*, 0C3, 0D3, 0G3, 85A2's, 5651's,etc. thru the years but I've never seen

tubes age 230From: Barry <[email protected]>Subject: Re: [R-390] OT: HP-410B Tubes> Sounds like you got some lousy 12AU7s. ...

tubes age 231>...The 6211 is another similar tube meant for long periods of cutoffconditionsOn the VARIAC at 115, filament voltage is right o

tubes age 232This may be at least another choice rather than crapping out the cathode withpoisons.Remember the old B&K Precision picture tube reju

tubes age 233I jumpered in a 15-ohm (what I had on hand) and, with the line voltage set to115, V2 was seeing right at 4.5 which is what is shown on th

tubes age 234needs to hit the flashing many times before it reacts, the time required for thegetter flash to clear the gas from decades-old tubes (ass

tubes age 235limited success. The trick was to leave the oven on for just long enough for thegetter to flash. Results ranged from "the tube was

tubes age 236Come to think of it, Bill Kleronomos did an article in Electric Radio years ago onhow to go about reclaiming gassy NOS tubes...I'm r

tubes age 237Oh, and, neither 12AU7A showed any significant signs of gas on the tester (nosurprise there).Anyway, I thought some of you might find thi

tubes age 238That's what Nolan Lee always said. He had enough tubes and parts to lastthrough the duration.---------------------------------------

tubes age 239--------------------------------------------------------------------------------------------------------Date: Thu, 03 Mar 2011 16:37:59 -

tubes age 24the tube characteristics change because of a different gas pressure, the tubecanstop conducting which lets the voltage rise up to the trig

tubes age 240not seen it on any parts lists or price lists of the usual sellers so don't knowwhat it is it's use.---------------------------

tubes age 241The second one didn't move the needle at all - not a flicker.I said to myself "Well, that's obvious: open filament."

tubes age 242Astonished (and very suspicious of a misunderstanding), I Googled and founda couple of references to this report as well as the AP articl

tubes age 243Hi Chris - good catch! I agree that number doesn't seem to make sense. After10 minutes of research, I think it is incorrect, or pe

tubes age 244not paid for long ago when small tube volume was high it has long since bitthe dust to other companies that had better financial bases. C

tubes age 245-----------------------------------------------------------------------------------------------------Date: Fri, 4 May 2012 20:15:29 -0700

tubes age 246">" "m"a"n"g"e"d" "t"o" "f"i"n"d" "t"h&

tubes age 247""T"r"y":" " "a"a"d"e"."c"o"m"/"l"i"n"

tubes age 248"a"m"p"l"i"f"i"e"r" "a"p"p"l"i"c"a"t"i&quo

tubes age 249"""s"i"m"i"l"a"r",""" "a"l"l" "t"h"e&

tubes age 25>I don't think I've ever seen one shorted,About the only way that one could short would be to have had a bad internalweld and

tubes age 250"o"t"h"e"r"s"," "s"o" "s"e"a"r"c"h")":&quo

tubes age 251Overview of TV models from Roger Kennedy's site:http://www.alltubetesters.com/articles/tester_guide.htmThe Military ModelsMost all m

tubes age 252----------------------------------------------------------------------------------------Date: Sun, 10 Aug 2014 21:35:52 -0500From: Raymon

tubes age 253Actually, most tube testers are deficient with regard to a number of parameters.As I said in my post, I use the TV7 as a go/no go indicat

tubes age 254

tubes age 26fullsize octal based 0x3 type with these problems. I think that all of those thatI'm using were built during WWII. or before It was o

tubes age 27>When testing VR tubes on the TV-7D/U, I find I have to press the>appropriate test button briefly several times for the reading to&g

tubes age 28would be enough trigger. I don't think the isotope would have any effect onstability or aging, just on the initial firing voltage.Int

tubes age 29This wouldn't be difficult to do at all. An adjustable regulated power supplywould be the way to go.>I don't know why most tu

tubes age 3state diodes from under the tube socket, carefully bending the tube shieldbases back into position, and inserting tubes into the sockets. W

tubes age 30Not to mention ambient light. <grin>------------------------------------------------------------------------------------------------

tubes age 31> Any thoughts? Is there a "Wizard of TV-7's" somewhere on the list?Yep, Dan Nelson. Hell of a good guy. Drop him a not

tubes age 32bought spares for an emergency found this out the hard way. It is best to rotatethem on a yearly basis.-----------------------------------

tubes age 33I've had pretty decent luck with the zippo treatment on gassy 6AK6's. Did you tryit?>I got some NOS ones at $5.00 each. Not t

tubes age 34picked up an extra three sleeves of them from him about a year ago. I'd guessthat he still has some. You can email him at k6kc@lights

tubes age 35From: "JAMES T BRANNIGAN" <[email protected]>Subject: Re: [R-390] 6GM6 mod for 6DC6Many years ago I tore apart a 75A

tubes age 36Asked, Are there any quick and dirty methods for testing a given tube's noise?And can one in some way calculate its noise from the or

tubes age 37older ones forward and add the new tubes to the end of the string to burn in.After a while burned in tubes get nosier again.Where we left

tubes age 386082WB? (Dunno what it looks like.) Any experience with adapting the 6.3 vversion-- the 6080? Any suggestions on getting them to run coo

tubes age 39Found on the Nostalgia Air Technical Discussion Forum: The Stancor P-8130is rated 12.6 volts @ 2 amps. You can clean up some oxide coated

tubes age 4 V602A, is used as the local AF amplifier and the other half, V602B, is used as the Line AF amplifier. V602

tubes age 40As for selecting for minimum noise, its probably effective to test for minimumgrid emission, minimum gas, and maximum gm, then align. If t

tubes age 41electrolytics so I prefer to replace them before applying power. Too muchselenium isn't considered healthy.I've known tube type

tubes age 42------------------------------------------------------------------------------------------------------------------------------------------

tubes age 43> continuous service ratings for greater transient temperatures.I've been following this thread with quite a bit of interest as I

tubes age 44hits 90+% and the temperatures range from below freezing to over 100degrees. nolan------------------------------------------------------

tubes age 45reference on them as substitutes. Same goes for the few 5R4WGB's and5R4GYB's that I have now. Would someone let me know if I can

tubes age 46>>>>use the Radio Shack 32-1031 transformer, use the 10 watt tap, closest to600 ohm Or, use the Hammond 600 ohm to 4 or 8 ohm

tubes age 47From: [email protected]: [R-390] Rectifier tube substitutionI have substituted 5R4 tubes several times for a 5Y3 with no ill effectswha

tubes age 48Type Heater Special Characteristics12AU7 150ma12AU7A 150ma Low microphonics5814 175ma ruggedized with

tubes age 49CV 8221 Standard 12AU7CV 9092 Ruggidized versionCV 10323 Standard 12AU7CV 10666 Standard 12AU7E82CC Ruggidized European versionE 2163 Stan

tubes age 56C4 will work as a replacement, but sometimes not quite as well as the6C4WA. 1. V202 is located in the RF subassembly, where

tubes age 50get the IF deck into shape. Back then it was tubes, tubes, tubes, and then thetubes. It was noise in tubes noise in the tubes and some tim

tubes age 51I just turned off my '67 EAC R-390A...it's ran long enough for now. It's going totake me a while before I can get used to s

tubes age 52synthetic motor oil for the primary lubricant has proven to be a winner. It'seasier to tune today than it was two years ago. I spent

tubes age 53Date: Fri, 15 Dec 2000 20:17:32 -0500From: "JM/CO" <[email protected]>Subject: Re: [R-390] 12AU7 and 12AU7A tubesThe &

tubes age 54<< You may be thinking of the 7025, which is a low hum version of the12AX7,...According to the book " Tube Lore

tubes age 55From: Nolan Lee <[email protected]>Subject: RE: [R-390] 12AU7 and 12AU7A tubesI never really noticed they were different internally.

tubes age 56hit the PTT to bring up AM mode. This rig is used a lot and had worked fine thenight before, this was the first time I'd seen this. I

tubes age 57------------------------------------------------------------------------------------------------------Date: Mon, 22 Jan 2001 11:34:21 -080

tubes age 58didn't work. I was looking for a method that would work with octal based tubeswhere the getter was in the base of the tube.>Do be

tubes age 59From: "Warren, W. Thomas" <[email protected]>Subject: RE: [R-390] Tube testersCheck out what Roger in San Diego said about juggl

tubes age 6 2. V603 is located in the Audio subassembly, where it is used as the local audio output amplifier. V603 appea

tubes age 60That's precisely what a Grid Circuit Tester does. It checks for grid emission thatmakes control grids go positive. I think I posted t

tubes age 61How well do stored tubes hold up over many years?I installed a pair of 1943 6C4 out of the box into my R390/A last summer. Theywere / are

tubes age 62terminals to give a proper load. If you have the Power meter shown in the TMuse it. If your meter has a DB scale on it then use it. You ca

tubes age 63Pull all the 5814's and check them in the local audio tube socket. Put the besttwo into the audio deck. Put the next best ones into t

tubes age 64See Skip, Its simple, all you have to do is...Strange, brand new tubes are noisier than used tubes. It can help to leave theR390/A on

tubes age 652. Try all three of the 6AK6's in the V-504 socket, after warming each for twominutes, check the carrier meter reading. The higher th

tubes age 66Date: Wed, 07 Feb 2001 12:33:06 +0100From: Kurt Brandstetter <[email protected]>Subject: Re: [R-390] military testing met

tubes age 67Not quite.. plate CURRENT change per unit of grid VOLTAGE. (Or in thegeneral case, the current change at the second tube element for a gi

tubes age 68voltages except the grid are moving because we are feeding the plate andscreen from power supplies. The ratio of ip to vg for smallvg is

tubes age 69The gain is then 10K x 3 mA / 1 volt or 30. This isn't too bad for a pretty simplecircuit. Keep in mind that the real load isn&apos

tubes age 7problem seen in most supplies; inrush current. Cold filaments exhibit a muchlower resistance than hot ones; this contributes to the turnon

tubes age 70------------------------------------------------------------------------------------------------------Date: Fri, 20 Apr 2001 08:49:11 -070

tubes age 71Barry Hauser on rejuvenation: I have done this once or twice on tubes like201a's with success, but it is a procedure that can only b

tubes age 72Tubes have lots of problems. There is no one way fix for every thing. Firstunderstand what problem has your tube and then apply the proper

tubes age 73From: blw <[email protected]>Subject: Re: [R-390] Tube questionsThanks. The only references that I have are the Sam's Subs

tubes age 74pull some of my spare tubes. I know that I do have some labeled with the GB, Ijust don't remember which company it was.>Also, I ca

tubes age 75You got the wrong Barry. I'm the other other Barry. It happens all the time. (g) Iread the 12AT7 sub in Hollow State Newsletter. I do

tubes age 76One tube sub that I have successfully used, is a 6CB6/6CB6A/6676 for the6DC6. The 6CB6 was used in a lot of VHF gear (repeaters or aircra

tubes age 77goes the other way with a cutoff more remote than the 6DC6. For it you wouldprobably eliminate the divider. Only if you love tweaking, o

tubes age 78because the components are crammed so darn close together. Let us knowhow you do. Lots of fun by the fire on a nippy fall evening.-------

tubes age 79I picked up three of these old 6C4's last year. These are in my receiver now.They are the best ones I have found in several years. Ju

tubes age 8We also know that for whatever reason heat is very bad for tubes, nickel-platedshields are very bad, should be used only to hold the tubes

tubes age 80------------------------------------------------------------------------------------------------------------Date: Fri, 4 Jan 2002 19:46:20

tubes age 81a bit bad about finding 3 of them for $11 each a while back, but not anymore.He can keep his stock of 26Z5s as far as I'm concerned.-

tubes age 82Subject: [R-390] 26Z5W - 12BW4 replacementsDate: Mon, 7 Jan 2002 12:16:31 -0600There is a good article on using the $4 12BW4 in place of t

tubes age 83----------------------------------------------------------------------------------------------------------Date: Mon, 7 Jan 2002 15:45:02 -

tubes age 84----------------------------------------------------------------------------------------------------------Date: Mon, 07 Jan 2002 20:29:53

tubes age 85>> >My understanding of "not using standby" is the "poisoning" of the cathode,with filament current and no HT

tubes age 86From: Rodney Bunt <[email protected]>Subject: Re: [R-390] sp-600-jx-17I run my SP-600-jx-17 on the 260v tap, for use in AUSTRALI

tubes age 87power, but you have to take the square root to get the equivalent voltage. Thusthe figure 0.707 or the square root of one half.> Rule

tubes age 88If you apply 25.2 volts to a diode and two 6.3 volt filaments all in series thefilaments you see the correct power whether the diode provi

tubes age 89> possibility that the structure is able to dissipate> heat just as effectively at the higher voltage for the> shorter period of

tubes age 9-----------------------------------------------------------------------------------------------------------From: David Ross <ross@...>

tubes age 90excess filament voltage is not a good thing. Deviations of the filament voltagein small receiving tubes of up to 10 percent are generally

tubes age 91After much headscratching I ultimately discovered that the filaments were inseries and the diode shorted! Apparently neither 6080's

tubes age 92law, it draws 5 amps (12.6 volts divided by 2.52 ohms). Now this power is 63watts (12.6 volts times 5 amps). Note how this is exactly 4

tubes age 93DC-heated, while an AC-heated filament would be more likely to lose emissionmore evenly. Barry Ornitz may have a better idea of what happe

tubes age 94signal that exceed .6 volts we can limit off across the bridge and into the load.I'll keep the finding here so we can share the knowl

tubes age 95From: "Kenneth Crips" <[email protected]>Subject: Re: [R-390] Tube cutting 101Date: Wed, 16 Jan 2002 19:07:18 -0700You are

tubes age 96I seem to recall a method where you use a small wire that you hook up to a 12volt car battery until its glowing good and hot, then quickly

tubes age 97Same tube, the W indicates ruggedized filaments. Unless you are operating iton a ship the 26Z5's will do fine.-----------------------

tubes age 98----------------------------------------------------------------------------------------------------------From: "Kenneth Crips"

tubes age 99-----------------------------------------------------------------------------------------------------From: "Greg Werstiuk" <g