Unless I miss my guess, either your HV is way down or your metering ckt.
is bad. For 572B's you should have at least 2200 volts DC under load. Have
you measured it with an external meter??
This is just my first guess at it. How many tubes in that amp??
carl / kz5ca P.S. what's the input swr ??
----- Original Message -----
From: <alan.kaul@att.net>
To: <amps@contesting.com>
Sent: Sunday, February 12, 2006 10:33 AM
Subject: [Amps] Clipperton L power output LOW
> I recently bought a Clipperton-L -- I am probably the 4th or 5th owner.
> The AMP suffers from low power output and I am wondering if others have
> experienced similar problems.
>
> The original 572B's were replaced with new tubes made by "CETRON" of
Geneva, Il.
> by the former owner who estimates they have perhaps 20-40 hours on them.
The output
> circuit is modified to include 10M.
>
> All my measurements of power output were made with a DAIWA CN-801
wattmeter with
> the rig connected to transmitting antennas --- SWR a nominal 1.3 or less.
All
> TESTS were conducted in the lower power position (the CW-X - SSB switch in
the
> CW-X position).
>
> Band Plate V Plate Current Power out
>
> 10 1600 ~ .475 A 400 W
>
> 15 1600 ~ .500 575
>
> 20 1600 ~ .600 650
>
> 40 1600 ~ .410 325
>
> 80 1600 ~ .450 450
>
> I would have thought that 80 and 40M output would have been greater than
20 and
> 15M output.
>
> Something else that is puzzling - the TUNE control while loading on 80M is
in
> the 1.8 mHz position, but when uisng the AMP on the higher bands, the TUNE
> control is close to the dial marking for 7, 14, 21, (there is no 28 on the
TUNE
> control because the 10M band was added later).
>
> I've checked some of the doorknob caps in the final with an L/C meter and
they
> test OK.
>
> Anyone else ever experience similar problems? Any ideas on where to
start.
>
> Please and thanks, 73 de alan
>
>
>
> --
> Alan Kaul W6RCL LaCanada, CA 91011
> e-mail: w6rcl@amsat.org
> http://
> home.att.net/~alan.kaul/index.html
>
>
>
>
----------------------------------------------------------------------------
----
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|