Help with IG-72 Audio Generator

[Ed Richards]

Dave;
I am not familiar with that kit, but engineers frequently use a light
bulb for regulation as the resistance of the filament varies greatly with
the current through it. (measure he resistance of a 100 watt bulb and
calculate the wattage according to Ohm's Law! It is not used to emit
light, just regulation. It very well could kill the circuit if open.
Warning! Use only the original number lamp or the circuit may not work
correctly!
Ed Richards


On Thu, 1 Jul 1999 07:14:28 -0700 Dave <zommbee at IX.NETCOM.COM> writes:
>Hello Heathniks,
>
>I have an IG-72 I'm trying to get working (without the
>schematic, of course :-)
>
>I've recapped it, replaced 1 bad 6X4, but still not
>getting it back to life.  There is NOT much to this
>thing!  The other tubes test good, and I've tried
>substitution as well.  Still zilch.
>
>But there is a lightbulb on the UNDERSIDE of the
>chassis - 110v 3w with a screw-in base.  It's open
>and I am getting a new one today.  It's different
>from the power light - it's not visible with the case
>on and seems to be just a load of some sort.
>
>What is this bulb used for and if
>it's open, will that stop the unit from oscillating?
>
>Any other ideas on what else could be wrong?
>
>Thanks,
>
>Dave WB7AWK
>http://www.boatanchors.com
>
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