Where Can I find one?

[Richard Bidwell]

To those who responded to my query, thanks a bunch.  I went to
Bulbman.com as suggested by Garey B. and there was my bulb!  I tried to
order online, but ran into some kind of problem, so Monday I will try
the old-fashioned way - by phone.  They will take any order - no
minimum, so it looks good.  Again thanks to all.  Cheers, Dick B. , VA



Garey Barrell wrote:

> Dick -
>
> I think that is a 3S6 bulb.   Look on the brass base, the number is
> often stamped along the edge nearest the glass bulb.
>
> Here is a source.  I don't know what their order terms are.   In
> "normal" use  :-)   they should never burn out since they are never
> illuminated.
>
> <http://www.bulbman.com/browseproducts/3S65-130.HTML>
>
> Essentially it is a temperature sensitive resistor that regulates the
> feedback in the oscillator to maintain a constant output level.  Just
> about any 120V 3W bulb would probably work, but that is not an easy
> config to find.  By the way, night light bulbs are typically 6-7 W.
>
> 73, Garey - K4OAH
> Atlanta
>
>
> Richard Bidwell wrote:
>
>> Hi group  -- I am in need of a part for a Heathkit audio generator,
>> IG-72.  Needed is a lamp/bulb used in the oscillator output control
>> circuit.  It is a 115 v,  3 w., small screw base, installed on the
>> bottom side of the chassis; overall length about 1 7/8"; Heath part no.
>> 412-2.  There is no ID on the bulb proper other than "USA".  It failed
>> because in troubleshooting the unit, which had quit, I accidentally put
>> about 400 v on the bulb which resulted in a very bright flash and a
>> burned-out filament.  I've checked with AES and Antique Tubes on the Web
>> to no avail.
>>
>> Can anyone suggest a source for such a bulb or what could be used as a
>> substitute if none are available?  This is the second audio osc. that
>> has pooped out in about a month, and I only have one left!   Will
>> appreciate any qadvice or assistance.  Dick Bidwell, VA
>>
>>
>
>

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