Where Can I find one?

[Garey Barrell]

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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