Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Chuck -
The S-Meter is a simple bridge circuit that compares the plate current
of V2 and V3 with the plate current of V4 and V5. There are only two
resistors and two trim-pots! Since the radio seems to be working more
or less normally, those tubes are probably "good enough". If the meter
needle is just sitting there on the mechanical zero point, it's most
likely an "open" in that circuitry. Just as a guess, I'd first check
the meter terminal connections, then wonder about the S-Meter
Sensitivity pot, but it could be a bad connection or (YIKES!) an open
meter movement. The movement itself is 3 mA, as are ALL the R-4/T-4
meters, so can be checked with a DMM for continuity. Don't try to use a
VOM, as they put too much current through the ohmmeter circuit.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B & C-Line Service Supplement CDs
<www.k4oah.com>
Chuck Grandgent wrote:
R4A, S-meter was working OK, just noticed it is not right now, don't
know for quite how long.
AVC is working, as evidenced by turning RF gain all the way down and
then back up, AVC slow takes very noticeably longer for the RF leve to
return once I turn up RF gain, compared to AVC fast.
Adjusting R40 and R42 for S-meter and balance have zero effect,
S-meter is all the way to the left.
Things to try ?
Tnx, Chuck, K1OM
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