[Hallicrafters] HT-44 questions

[Fern Rivard]

Hi Waldo:
    If the filaments of the final tubes are wired in series, then simply 
disconnect one plate cap at a time to verify the idling current of each 
tubes. Otherwise, unplugging one tube at a time (if filaments are wired 
in series) will result in "no emission" in either tube!    Fern


----- Original Message ----- 
From: "Waldo Magnuson" <magnuson at mac.com>
To: <hallicrafters at mailman.qth.net>
Cc: "Waldo Magnuson" <magnuson at mac.com>
Sent: Sunday, April 02, 2006 8:55 PM
Subject: [Hallicrafters] HT-44 questions


>I got my SX-117 restored to original configuration and it performs 
>good.  So I moved on to my recently acquired HT-44.  After cleaning up 
>the internal antenna relay installation I applied power following the 
>Tuning Procedure.  The first thing the manual mentions is to adjust the 
>bias before proceeding with the Basic Tuning.  I checked it according 
>to section 9-3 in the manual and it adjusted nicely to one volt (100 
>MA) idling current for the finals just like the manual states.  It 
>looked so good that I did a Final Tube Matching check (section 9-4). 
>The manual states to pull one final tube and adjust the Bias to 0.5 
>volts (50 MA) and then swap tubes and they should check to within 0.1 
>volts).  Well the problem with either tube in either socket I get NO 
>bias reading.  I checked both output tubes (6DQ5) with my tube checker 
>(Hickok 6000A) and both check normal.  When I try to do the Basic 
>Tuning I get no RF output.  Why do I get the correct idling current but 
>nothing else?  Any thoughts on what to check next?  Thanks.
> 73,  Skip  W7WGM
>
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