[Heathkit] HW-16 neon lamp?

[Sandy W5TVW]

The neon lamp in  HW-16 is an NE-2.  Any common wire lead lamp will probably 
work.  It is the "sidetone" generator.
73,
Sandy W5TVW
----- Original Message ----- 
From: "Tom NØJMY - AAR7FV" <tfarl at mchsi.com>
To: "Tom Laird" <w9qi at arrl.net>
Cc: <Heathkit at mailman.qth.net>
Sent: Friday, February 02, 2007 9:31 PM
Subject: Re: [Heathkit] HW-16 neon lamp?


> Well, let me think.  I know it's the crucial component of the 
> much-maligned relaxation oscillator for the HW-16's sidetone.  I think I 
> broke mine off on purpose.  It doesn't affect anything besides the 
> sidetone.   I don't believe it's a NE-2, although I could be wrong.  What 
> I base that on is the fact that the neon lamp used for differential-keying 
> the HG-10/B is a NE-2, with the Heath P/N 412-11.   The P/N for the 
> sidetone neon lamp in the HW-16 is 412-34. (Unfortunately, my HW-16 manual 
> doesn't give the type, it just refers to it as a neon lamp).  Of course, 
> that doesn't necessarily mean it's not a NE-2, but it doubts me.  Maybe 
> someone who has a copy of the Heathkit master parts list could look up the 
> Heath P/N  412-34.
>
> I'd be interested in what you find out, and I would also be interested if 
> anybody has mad a quick and dirty replacement that sounds better out of an 
> IC chip, like a 555 or something.
>
> 73 es GL,
> Tom
> Fredericksburg, Iowa
>
> Tom Laird wrote:
>> I'm working on a HW-16 and noticed the Neon bulb at the rear of the 
>> circuit
>> board has a broken wire, unfortunately at the bulb. Three questions:
>>
>> 1) is it a NE-2?
>>
>> 2) what does it do in the circuit? Looks like it pads the -150 volt line 
>> to
>> the crystal osc. and the Q1 bias switch
>>
>> 3) do local hardware stores carry those things?
>>
>> Tnx,
>>
>> Tom Laird W9QI
>> Moline, IL.
>>
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