[Heathkit] SB610 sweep saga, continued

[Mike McCarty]

Michael Tortorella wrote:
> Gang,
> 
> Thanks again for the info.  I fear I have set off a wild goose chase because
> I made a typo in my original post, deep regrets the unit is a 610, not 620.
> The 610 seems to have only one neon bulb, that is the pilot light, but the

Hee hee hee!

> consensus opinion seems to be that it is doing double duty as pilot lamp and
> part of a relaxation oscillator.  Tomorrow I will restore the pilot circuit
> to its original configuration and see what happens.

Well, on the 610 schematic I have, the Ne bulb is _only_ a pilot lamp.
It doesn't serve any other purpose. You could put any 120VAC pilot
lamp in there and drive it in parallel with the primary, or you could
put back in a Ne lamp, or you could replace it with a low power 6.3V
pilot lamp (like a #47) and run it off of the 6.3VAC winding driving
the tubes other than the 3RP1.

In the 610 the sweep voltage is generated by a multivibrator (V3A/B)
in the schematic I have.

> Once again, I am sorry to have misled anyone by my typo.  Thanks to the many
> who responded.  This is a great group.

Hey, what's a good group without a good discussion?

> 
> 73
> 
> Mike W2IY
> 
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