Where can we get a copy of the article, is it posted someplace?
mike
In "Ham Radio Magazine"April 1978 there was an article titled "Testing
Power Tubes"
by Joe Carr K4IPV (SK). It covered the basics in transmitting tube
testing and evaluation.
Recommended reading.
73/
Karl-Arne
SM0AOM
----- Original Message -----
From: <alan.kaul@att.net>
To: <amps@contesting.com>
Sent: Saturday, March 04, 2006 11:33 AM
Subject: [Amps] testing 572 B tubes
> Does anyone know if there is a way to test 572 B's?
>
> I recently acquired this AMP. It had "fairly new tubes" -- according
to the previous
> owner perhaps 20-30 hours on them. I found I was unable to load it up
to more than 400-600W
> output and suspected the 500 pf plate bypass cap (which a couple of
you mentioned as a possible
> problem). I replaced the plate bypass cap, with a .001 mfd and added
a .01 mfd in parallel.
> Then I replaced the plate RF choke with a new choke from RF parts
designed for use in
> Ameritron and other amps (it specs at 1.5A, 225 uH, 4 KV max). Then I
put it all back
> together and fired it up and the power output is pretty much the same
as before I
> made the changes.
>
> So I am wondering if the TUBES might be a little soft.
>
> Anyone have any other ideas??
>
> Please and thanks and best 73 de alan
>
> --
> Alan Kaul W6RCL LaCanada, CA 91011
> e-mail: w6rcl@amsat.org
> http://
> home.att.net/~alan.kaul/index.html
>
>
>
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