[AMRadio] No mic gain control

CL in NC mjcal77 at yahoo.com
Tue Jan 27 13:08:54 EST 2009

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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