[Hallicrafters] HT-44 questions

[Roger K8RI]

> Hi Waldo:
>    If the filaments of the final tubes are wired in series, then simply

Becareful about screen cuttent when removing plate caps.

> 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

It's been a long time since I had the 44 and 117 (bout 64 or 65 ... when 
ever they came out), but as I recall they had a specific procedure for 
matching with both tubes plugged in.

As I recall the matching is not really critical in the 44 and you can be off 
quite a bit more than what they use for matching.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com
>
>
> ----- 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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>
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