[AMRadio] No mic gain control

Peter Wittenberg k2lrc at k2lrc.com
Tue Jan 27 13:13:41 EST 2009

Charlie, my bet is that the D-104 that you have has the preamp in the base.
Take it out or try to turn the audio pot down and see what happens.

-73-  Peter K2LRC
In God we Trust !

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of CL in NC
Sent: Tuesday, January 27, 2009 1:09 PM
To: amradio at mailman.qth.net
Subject: [AMRadio] No mic gain control

Other than saving the cost of a pot, anybody know why Heath left a mic gain
control off the 6 and 2 meter Seneca XMTR?  Have one I picked up at Shelby
last year, and it is now working great, but, the controlled carrier AM bangs
out 100% to overmodulation with just a normal voice level 1 foot from the
D104.  Circuitry is good, tubes good, clamper working fine, PA bias slightly
up at 60 ma instead of the book value at 50ma(also no adjutment for this, no
bias supply).  This is the same mod circuitry as in the DX60.  Anybody think
it is worthwhile to put a pot in one of the mic amp grid circuits to set
this level?  Probably just mount it on a bracket under the chassis to avoid
drilling chassis or front panel.

Charlie, W4MEC in NC

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