tubes age 158
I found the box marked 12AX7's (good news), what was in there was 20 nos
mil pkg. RCA JRC 5651's (bad news). Sorry guys, I should have looked first
before I sent my first message. Anyone have a use for these? $2.00 ea plus
postage or $30.00 for all 20 and I'll pay for shipping in the lower 48. Requests
for all 20 take first preference. I do not have a listing for testing these on my
Hickok 534 so they are as is and appear to be NOS.
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Date: Wed, 21 Dec 2005 14:39:12 -0800
Subject: Re: [R-390] Re: corroded tube pins
The PINS mady be of a Tungsten or Tungsten alloy. I've run across the same
corrosion or is it severe oxidation. In those cases I have used a fine wire bush
(not those cheap brass on that you find from abroad), but thie good high density
ones that are small on a wooden handle. It is still difficult to reach the inside
area of the tube pins, in which case mild scrapping with a X-ACTO Knife blade,
Razor Blade, or I use a Medical Scapple which also does the trick. Just scrape
gently at an angle as not to gouge or nick the pins. <snip>
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Date: Wed, 21 Dec 2005 17:44:59 -0600
Subject: Re: [R-390] Training manual
Regulators in the R-390/URR are 6082's...
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Date: Wed, 21 Dec 2005 19:16:05 -0500
Subject: Re: [R-390] Training manual
It uses two 5651 tubes (V608 and V609) in series to set the voltage. Then it
uses an active series regulator circuit employing a 6BH6 as the error voltage
amplifier (V607) followed by two 6082 triodes as cathode followers (V605,
V606). The 5651 is sorta like an 0A2 or 0B2 except that the voltage is supposed
to be more precise.
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Date: Wed, 21 Dec 2005 19:13:20 -0600
Subject: Re: [R-390] Training manual
(14 pages)
(10 pages)
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