[Hallicrafters] HT-44 carrier balance

[rbethman]

Ed,

    While not an HT-44, I HAD the same excursions with my HT32A.  Upon 
an indepth troubleshooting session, I founf it to indeed be the RF level 
potentiometer.  While I didn't replace it, I was able to take the back 
cover off an clean it adequately.  For some of these pots DeOxit is the 
thing - BUT - some of the Hallicrafters pots use a different system 
whereas an inner metal ring is pressed on by a rotatable wiper pressing 
it against the actual resistance material.  DO NOT use DeOxit on these 
pots.  Either use straight alcohol, or a color tuner cleaner.

Bob - N0DGN

Ed Gable 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 !
>  
>
 
+-------------------------------+----------------------------------+
|   N0DGN AMRadio Manassas, VA  |          Home Builder            |   
+-------------------------------+----------------------------------+
| Bob Bethman                \\\|///     " The absence of a danger |
| rbethman at comcast.net      \\ ~ ~ //      signal does *NOT* mean  |
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|        2 BC-610s w/BC-614s, 2 R-390As - 1 Collins 1 Eac          |
|         Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A           |
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