I have a venerable AL80A which I do like very much. Clean and does very good
I hate the relay clunk from the T/R relay.
I am now putting in a GH-3 Gigavac relay for the output. Got a nice deal on
one through Ebay. Now then, for the imput I am using a smaller relay from
OMRON which has 3 amp contacts. Doing the math, the 3 amp contacts are heavy
enough to handle the 100 watts input with an SWR from 1:1 to 2:1.
The question I have for this august group of amp builders...is the bias control
part. The relay I purchased is a 4PDT switch with a very quick make and break
time. My question is (and this is where my experience gets a little thin) what
is the ramifications of used the other side of this relay to control the bias?
The whole B- of the amp goes through this relay...3KV and around 400 or so MA.
(I do not load this thing up past 400 ma as per the Eimac tube specs) Looking
at the schematic it says there is only 25VDC unkeyed and 7 VDC keyed. But, The
whole B- is going through this switch as a return path to the isolated filament
transfer for the 3-500Z.
Now that I have you all laughing at me....could someone clarify this?
Lee - K0WA
"I hate the CLUNK"
In our day and age it seems that Common Sense is in short supply. If you don't
have any Common Sense - get some Common Sense and use it. If you can't find
any Common Sense, ask for help from somebody who has some Common Sense. Is
Common Sense divine?
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