"francobevi francobevi" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Garey,
I checked wiring and the contacts on S-3B. It seems they are making contact
and in order! To be sure the muting plug was making a contact I directly
grounded the muting plug inside the receiver.
All components seem good but the tube V1, which looks rather bad (it's a
kind of dark inside) and does not heat very much compared to the other
tubes. Could it be possible due to a fault in the tubes??
Another thing: I performed the "bulb test". I put in series a 60 watts bulb
in the AC line and checked some equipment. Actually the Drake 2C seems to
have some leakage somewhere. The bulb lights not just for a second or so
but, although it dims, it has about the light of a candle. Diodes are
original. I am going to replace the filter capacitors and in the case also
the diodes with 1N4007 type to see if this makes any difference.
73s,
Frank
From: Garey Barrell <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: francobevi francobevi <[EMAIL PROTECTED]>
CC: drakelist@www.zerobeat.net
Subject: Re: [drakelist] AGC Fault Drake 2-C
Date: Sun, 16 Apr 2006 23:19:18 -0400
Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Frank -
I haven't worked on that many 2-Cs, but it sure sounds like either your
MUTE shorting plug "isn't" or possibly the contacts on S-3B aren't making
contact! What you're seeing is exactly what I'd expect to see if the MUTE
shorting plug was left out. The S meter can drift around with the AGC off,
and often moves upscale.
This must be the day for weird Drake problems with Rob's three apparently
bad final tubes and your "non-shorting" MUTE plug!!
73, Garey - K4OAH
Atlanta
Drake B & C-Line Service CDs
<http://www.k4oah.com>
francobevi francobevi wrote:
"francobevi francobevi" <[EMAIL PROTECTED]> made an utterance to the
drakelist gang
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Hi guys!
I am trying to repair the agc of a Drake 2-C.
First I notice that in standby the s-meter goes up S9+40, while setting
the function switch to ON (or external muting with the muting plug) the
s-meter goes to S1 but it moves up to about S5 with the AVC in OFF
position when strong signal are heard (that's strange should it really
move or stay fixed?? on strong signals distortion is heard). In AVC
postion SLOW or FAST the S-Meter goes to S9+40 as in postion STANDBY and
nothing is heard.
I measured the voltages at TP1: in position AVC OFF it is -1.35 Volts, and
in position AVC SLOW or FAST it is something like between -15 Volts.
I was thinking that the wiring from the function switch to the AGC section
could be wrong but before making any change I would like to know what you
think it could be.
73, Frank
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