Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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When the bias fails, the finals conduct. The VOX trips because the bias
is ALSO used to bias off the relay tube. Bias gone, the relay tube
conducts, and the relay pulls in. You know the rest!
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
Chuck Grandgent wrote:
"Chuck Grandgent" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Well I have done the AC4R to one of my AC3s.
I am however a 95% CW guy, so how would the VOX trip ?
My habit is to leave the drive down all the way when I leave the room.
Chuck, K1OM
On Dec 16, 2007 7:58 PM, Gary Poland <[EMAIL PROTECTED]> wrote:
"Gary Poland" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Chuck,
Nothing you can do short of turning the equipment off would prevent the
final tubes to fully conduct if the bias went positive and the VOX trips the
relay. I have had it happen only once in the 15 years I have been using
Drake equipment and I only noticed it after I keyed my TR-6, very high
idling current. Fortunate the VOX didn't trip while I was out of the room.
Best way to prevent a problem is to, at a minimum, recap the bias supply in
the AC-4. In my case I bought just the bare PC boards from the Heath Kit
Shop and my own parts. My five AC-4's and one AC-3 have been rebuilt with
them.
73, Gary W8PU
http://home.cinci.rr.com/w8pu
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