Why modify old beauties for the sake of tubes which are readily
available? The power saving will be negligible if any, and the
beauty of the glowing tube contributes to the beauty of the classics.

Irv VE6BP

Rich Evans wrote:

I would like to convert the 0B2 and 0A2 voltage regulators
to solid state in two Hallicarfters HQ-170 and HQ-180.

I guess zeners are part of the answer. Does anyone have
any ideas for this?

Rich W3FYD

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Irv Finkleman,
Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP
Calgary, Alberta, Canada