...THE one thing to watch for is the air capacitors' plate spacings- if they
can sustain the new voltages, otherwise you probably can get by- of course
bearing in mind that the taps on the tank coils will probably have to be
moved.
Alex 4Z5KS
SunWolf
"Jesus, come get your kids, they're tearing up my Mother's backyard!"
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of kg7hf@comcast.net
Sent: Tuesday, December 02, 2008 7:27 PM
To: amps@contesting.com
Subject: [Amps] amp repair/modification
Hi everyone,
Speaking of homebrew & repair, I have a general question I would like to
throw out to the group.
I have a junker HF amp (160 - 10m) which use a pair of 3-500z tubes (g-g
obviously), the tubes are gone, the plate transformer is gone, a few caps in
the HV filter bank are gone, there isn't much left but the bare RF deck,
meters, band switching, load and tune caps, and filament transformer.
Now, I have a new blower, 3cx800a7, filament transformer and plate
transformer which would work with the 3cx800.
Besides the obvious mechanical/airflow changes, what other sorts of changes
might be involved to putting the 3cx800 in place of the 3-500s? The new
filament and plate transformer would have the correct voltage for the
3cx800. at a minimum, I suppose I would need some sort of warmup timer for
the HV. The input and output impedances wouldn't be the same I'm sure?
Is it basically a basket case idea and I should rip it all apart and start
from scratch, or could many of the components be re/used in place?
Thanks in advance for the comments.
73,
Paul, KG7HF
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