Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Tom -
Well, pretty soon the relay would close, which is what allows the
"unbiased" finals to overheat. The same relay would also mute the
receiver, so if you are listening to the receiver and all of a sudden
the rig goes into transmit and the plate meter pegs, it might be a good
idea to turn it off! The real problem shows up when you go in the
other room for dinner or whatever and leave the rig in receive.
Best protection is to replace the bias supply diode and filter cap NOW
if it hasn't already been done. Better still would be to replace ALL
the caps and diodes in the AC-3/4 with the excellent board/kit offered
by Mike Bryce of the Heathkit Shop. Then you can forget about the power
supply for another 30 years!
73, Garey - K4OAH
Atlanta
Drake 2-B, 4-B & C-Line Service Data
<http://www.k4oah.com>
Tom Taylor wrote:
Is there a way to know when the bias supply has died? Suppose you're
sitting in front of the radio, it appears to be operating normally,
and then the bias suddenly disappears (i.e. diode opens, cap goes out,
etc.). At this point, you're simply listening to the receiver. What
indication would you get on the xmtr other than the 6JB6's (or 12JB6's
for TR-3's) turning red hot? It sounds like we need a klaxon alarm
wired to the bias :-)
Tom n7tm
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