[R-390] RE: tube testers

[Michael Murphy]

Steve,

We are not that interested in DC gain or even DC Transconductance I think.
Lets talk AC and High frequency. There probably are only four tube types in
the 390 worth testing if you are talking about sensitivity and signal
handling (which seem to be the hot buttons). I think these could be handled
with a  high frequency bench generator at say 500 kHz and 10 MHz, a chassis
with wired tube sockets and a high gain low noise amplifier and finally a
Scope or high frequency AC meter to test high frequency gain and noise. This
would not be the simplest way to find "Good" or "Bad" tubes but it would be
a possible way to find "Better" tubes with good high frequency gain and low
noise characteristics.


Mike WB2UID

----- Original Message -----
From: "Steve Hobensack" <stevehobensack at hotmail.com>
To: <r-390 at mailman.qth.net>
Sent: Wednesday, October 27, 2004 6:49 PM
Subject: [R-390] RE: tube testers


>
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> The RCA Receiving Tube Manual has lots of good info on tube testers
> and tube tester circuits. There
> are simple schematic diagrams on tube tester circuits that can be set
> up on the bench using variable power supplies , variable rheostats,
> and ac/dc milliameters.  These test jigs are good for testing a lot
> of  the same kind of tube. I have several manuals dated from the
> forties to mid sixties and can be found on Ebay , hamfests , etc.
>
> 73....Steve...N8YE
>
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