[Boatanchors] Hallicrafter HT 32 A PTT problem

[jeremy-ca]

I smell a leaky capacitor someplace in the food chain. I just picked up a 
HT32A with manual and will try and help if needed.

Carl
KM1H


----- Original Message ----- 
From: <revcom at wbsnet.org>
To: "Francis Sanita" <fsanita at cfl.rr.com>
Cc: <boatanchors at mailman.qth.net>
Sent: Thursday, September 27, 2007 10:30 AM
Subject: Re: [Boatanchors] Hallicrafter HT 32 A PTT problem


> Frank..
>
> Not sure on this, too many years ago.  Doesn't  the HT-32 use an
> amplifier tube to key relay?  Both in PTT and VOX.  Can't find
> manual right now but had an HT-32 about 40 years ago. (still
> have one but not hooked up)  Simular to Collins circuit, no direct
> connection to relay from Mic PTT.  Weak tube/poor capacitors, etc.
> Am I right?
>
> Rod
> K0EQH
>
>
>
> I have a HT 32A that stopped TX with PTT and would not trip in MOX.
>> When using a Shure 444 I need to turn the VOX adjustment all the way
>> up to be able to use PTT ( I do not use VOX mode). When I use a D 104
>> I need to turn the VOX adjustment down or the TX trips as soon as the
>> mic plug gets near the jack. All just stopped working.
>>
>> I checked the switch assembly and cleaned all contacts of all the
>> switch assemblies. They all looked fine.I swapped V17 - 12AT7 - with
>> two other tubes and the condition remained ( by this time I was
>> getting sporadic PTT contact). I cleaned the contacts on the relay.
>> The relay made a weak - half hearted contact at times and no TX but
>> when it made contact it hit hard. I wiped all the tube pins and a dab
>> of Deox and put tubes in and out several times. Still sporadic TX on
>> PTT but it was getteing better. There were two plug assemblies with
>> wiring that all pins were
>> cleaned and still poor PTT TX.
>>
>> I sprayed the VOX delay and adjustment pots and worked them and the
>> MOX worked normal and the PTT seemed to work normal and strong contact
>> with the Shure 444. Checked for poor grounds but the inside of the rig
>> is clean.
>>
>> Put the chasis back in the case hooked it up and PTT and MOX started
>> to fail again. Turned VOX adjustment up and Shure 444 did TX but had
>> misses. Replaced it with the D104 and PTT works fine but MOX needs to
>> have operation switch to CW and then to MOX to go to TX to tune. It
>> does put a good signal out but I know the PTT/MOX is not working to 
>> specs.
>>
>> Any similar problem or advice from Halli land??
>> Thank you
>>
>>
>> __._,_.___
>> Frank AA4FS
>> Palm Coast, Fl
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>
>
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> ** For Assistance: dfischer at usol.com **
> $$ For vintage radio info, see the HCI web site $$
> http://www.w9wze.org
>
>