Heathkit HR-1680 bulbs

[Gerald C. Lemay]

Before you go any further, measure the voltage at the bulb sockets to make
sure it is not over voltage. I don't have the manual right now but +V
should be in the vicinity of 12 to 13 volts. Others may correct me on this.
I would also expect to see anywhere from 16 to 18 VDC at the input to the
regulator (based on design experience). Since both lamps are burned out and
it appears that a lot of extra heat was generated next to the plastic
parts, that might be evidence of a blown regulator which is passing on the
full voltage appearing at the regulator input. Unfortunately the BAMA
website does not have the manual but there are other sources on the web
where you may be able to purchase a manual.

> First of all, I'm new to this list and am glad to be part of it.  Right
> now, I'm trying to rescue a HR-1680.  The front panel bulbs are burned
> out, and since the plastic shows signs of heat damage, I half suspect
> that those installed are the wrong ones.  (It was a common practice to
> replace the original ones with brighter ones, which always led to
> "browned" plastic.)  Could anyone suggest the correct bulb?  I don't
> have a manual/schematic available.  Thanks in advance.
>
> Fred Wittman
>
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