tubes age 78
because the components are crammed so darn close together. Let us know
how you do. Lots of fun by the fire on a nippy fall evening.
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Date: Mon, 1 Oct 2001 19:03:07 -0700 (PDT)
Subject: Re: [R-390] R390A tube chart & PUZZLEMENT!
I remember having a phantom short response in my TV-10/D that would show
up even with no tube in the socket. I tried moving the ferrite beads away from
the socket tabs and routed the wiring carefully so as not to pinch it when I
returned the front panel to the case,...... not really sure what fixed the problem
but it was one of the two.
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Date: Tue, 2 Oct 2001 06:43:42 -0700
Subject: Re: [R-390] R390A tube chart & PUZZLEMENT!
I use a 539 for my tube testing, similar in design to the TV-7 series. I find that
the line voltage setting is quite critical when making the short test. If the line
voltage setting is the least bit high it will show a short when one is not present.
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Date: Wed, 3 Oct 2001 19:27:40 -0400
Subject: Re: [R-390] R390A tube chart & PUZZLEMENT!
Have you performed the obivious test - check the "shorted tube" with an
ohmmeter? So far, any shorted tubes I have found indicate a short between
pins with an ohmmeter. Could also do the test with the filament powered if you
suspect a temperature induced failure.
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Date: Wed, 5 Dec 2001 02:14:04 -0800 (PST)
Subject: [R-390] tv-7/u problem and ca-4 tube data
My fair radio r-390a is backup and sounding good I took all your tips and used
some of them on my receiver. replaced the meters and some if and audio
caps, swaped out the if deck for my spare as the 2nd seemed bto be more
senstive (alignment ?) Set the end points and did the lankford mod. All this
gives me more courage to work on my 2nd r-390a which is in worse condition.
<snip>
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Date: Mon, 10 Dec 2001 08:51:56 -0800
Subject: Re: [R-390] "Vintage" 6C4
(14 pages)
(10 pages)
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