Me EC1CT and my dad EC1CTT, we will be there....73 and C U
Fernando EC1CT // KD0IGJ
E-Mail: ec1ct@esbesaya.com
KR DX Group
--------------------------------------------------
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
Sent: Thursday, May 12, 2011 7:19 AM
To: "k7fm" <k7fm@teleport.com>; "Robert Groh" <rgroh@swbell.net>;
<amps@contesting.com>
Subject: Re: [Amps] Question: looking for a design for a simple
testfixturefor4-125A> Anyone else going to Dayton?
> 73
> Bill
> wa4lav at space 2905
>
> ________________________________________
> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
> Of k7fm [k7fm@teleport.com]
> Sent: Wednesday, May 11, 2011 11:37 PM
> To: Robert Groh; amps@contesting.com
> Subject: Re: [Amps] Question: looking for a design for a simple test
> fixture for4-125A
>
> "I just would love to find out if these tubes will work and pull current
> and
> handle some voltage."
>
> In the 1930's, hams did not have tube testers - so they tested each tube
> manually by setting applying some voltages, measuring current, then
> calculating gain of the tube. You can actually some testing with a
> filament
> transformer, a couple of analog or digital volt and current meters and a
> pot
> (or vaiable voltage source.
>
> Not long ago, I wanted to know if a big old 211 was any good. I set up a
> filament transformer, used a 9 volt battery for the plate supply, a
> microammeter for a plate current meter, another voltmeter for the grid.
> Then, I varied the grid voltage and logged the plate current change with a
> change in grid voltage. Surprisingly, the gain was calculated in the ball
> park.
>
> No, this will not test the tube under actual operating conditions - but at
> least you will be able to compare one tube with another and see if you
> have
> any real duds. No, it is not like testing the tube on 6 meters. But, you
> have a crude tube tester with not much expenditure in time and no money.
> Test the tube as a triode, strapping the screen to the plate.
>
> The good news is that you do not have to worry about getting shocked.
>
> 73, Colin K7FM
>
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