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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