[Hallicrafters] HT-40 question

[rrkrr]

I had an HT-40 in the early '70s.  The two NE-2H bulbs in series
monitored the AM modulation, and were used to indicate distortion,
though I don't recall whether distortion was indicated by them flashing
on or blinking off.

Bob K4ERR


Tom NØJMY wrote:
> Would it possibly be for differential keying?  The correct voltage neon 
> lamp can be used for that application, e.g. the Heathkit HG-10 VFO.
>
> 73,
> Tom NØJMY .   .
>
> Hayseed Hamfest Co. - Multi-section Can Capacitors
> for vintage Heathkit, Drake, Halli, Hammy, more...
> www.hayseedhamfest.com
>
> RICHARD SOLOMON wrote:
>   
>> More likely it is an NE-2 that they used for an el-cheapo VR tube !!
>>
>>  
>>
>> But, I haven't seen the schematic either.
>>
>>  
>>
>> 73, Dick, W1KSZ
>>  
>>     
>>> From: james.liles at comcast.net
>>> To: hallicrafters at mailman.qth.net
>>> Date: Fri, 5 Jun 2009 11:34:18 -0500
>>> Subject: [Hallicrafters] HT-40 question
>>>
>>> Hi Les:
>>> If memory serves me correctly --- The later models of the HT-40 had an over 
>>> modulation detector on the front panel which was a neon indicator. The 
>>> original owner may have added the circuit --- but why under the chassis???
>>>
>>>
>>> Original message:
>>>
>>> Message: 9
>>> Date: Fri, 5 Jun 2009 00:45:00 -0500
>>> From: "Leslie Hock" <lhock at comcast.net>
>>> Subject: [Hallicrafters] HT-40 question
>>> To: <hallicrafters at mailman.qth.net>
>>> Message-ID: <20090605054459.0DAB13738B3E at mailman.qth.net>
>>> Content-Type: text/plain; charset="US-ASCII"
>>>
>>> Good evening folks,
>>> I have a question about the HT-40. I have just purchased one and
>>> the seller wrote me the following:
>>>
>>> "The transmitter lost power after a few dits and dahs. The tubes all check
>>> out 100% and no pooped caps. I traced it to a small neon bulb under the
>>> chasis that they use as a regulator. One of the hair-thin leads broke at
>>> the bulb. I tryed to solder, but no go. You will see this bulb in the
>>> wiring sk and parts list. You would need to replace it. Very small $ item.
>>> Prior to that it had a good 45 watts out on cw."
>>>
>>> I don't have the radio yet but I'd like to get the replacement part as soon
>>> as possible.
>>>
>>> I can't seem to find a parts list for the HT-40. Does anyone have an idea
>>> as to what the bulb is that he is referring to? I don't believe it is one of
>>> the two LEDs on the front but I just don't know. The HT-40 was my first rig
>>> as a teenager and now that I've turned 60, I'm trying to recreate my old
>>> station. I don't remember seeing a bulb under the chassis but then I was
>>> really looking back then.
>>>
>>> If anyone has a part number and/or a source for these bulbs, I would really
>>> appreciate the information.
>>>
>>> Thank you,
>>> Les Hock
>>> WB5JWI
>>>
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>>     
> ______________________________________________________________
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>   


-- 

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