[Hallicrafters] HT-44 carrier balance

[Ed Gable]

Hello Bob, Bill and Hallicrafters fans.  Thanks for the
feedback on ur experiences with HT-xx carrier suppression
problems.  It was indeed the .01 caps on the Bal Mod
cathodes.  I put my scope on one of the cathode pins and
waited.  Sure 'nuff, when the carrier popped up to 50 watts
one of the bypassed cathodes had tons of RF on it.  Replaced
that .01 (actually replaced all four) and the carrier is now
gone... which is a good thing!  Thanks again.  73,

Ed Gable  k2mp
Curator, AWA Museum
see:  www.antiquewireless.org

> 
> Ed Gable <k2mp at eznet.net> wrote:
> 
> >Has anyone seen a problem with severe carrier unbalance in
> >the Halli HT-44 ?  I'll be transmitting fine and all of a
> >sudden the carrier goes to over 50 watts.  Unkey and key up
> >and it may or may not have a carrier again.  It is proven
> >it's carrier and not PA spurious.  When at full carrier
> >the chassis is very microphonic and tapping any tube causes
> >lots of microphonic noise in a nearby receiver.  I've changed
> >all the tubes except the 6DQ5's.  mic gain and RF level
> >pots have no affect.  When the carrier is there the BAL
> >pots have little effect, when the carrier is not present the
> >BAL pots null perfectly.  HELP !
> >
> >73,  Ed  k2mp
> >see www.antiquewirelss.org
> >
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