tubes age 119
6BA6, and 6BC5, and another pinout I forget which, which is like 7BK but with K
and G3 swapped.
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Date: Mon, 30 Sep 2002 16:25:59 -0500
Subject: [R-390] Gassy Tube?
I have two of the same kind of tubes (6CW5) and I think one of them is gassy. I
can put them in the tester and observe the cathode-to-control-grid voltages.
With the bias set to about 2 volts, when I depress the "test" button (applying HV
to the plate), the grid voltage goes up to about 4 volts for one tube, but the other
one goes to about 7 volts. Would gas be responsible for this difference
between the two? If so, which one would be the gassy one? I *think* it would
be the one with the lower voltage, but I'm not sure. Is this a valid thing to try to
check? I know that "in circuit" is the best test of a tube, but when the problem
starts, I'm not sure what's causing what. Several voltage points begin to go
haywire and I'm not able to isolate it. I do know that if I swap the tubes, the
phenomenon seems to "swap positions" so I'm pretty sure I've isolated it to a
bad tube, but I'm just curious which one. I'm going to order two NOS tubes, but I
would like to know if the above tests are conclusive of anything.
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Date: Tue, 01 Oct 2002 00:46:13 -0400
Subject: [R-390] Tube box source?
Hi, I have a bunch of tubes that are loose and wonder if anybody knows of a
source to get those empty, plain white boxes. I need the size. that will fit 5814A,
6AK6 etc.
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Subject: Re: [R-390] Tube box source?
Date: Tue, 1 Oct 2002 08:39:32 -0400
Antique Electronics Supply aka AES has these. URL is
www.tubesandmore.com
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Date: Tue, 22 Apr 2003 21:01:33 -0400
Subject: Re: [R-390] Re: IERC tube shields and tube temps...a field expedient...
Enormous chunk of wasted bandwidth follows ..... 1200 baud modem users
proceed at your own risk :) This gets a little complex. On the thermometer
question it depends on what you want to measure. An IR thermometer will
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