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Grid Leak Bias

It's been more than 40 years since I messed with contact (grid leak) bias. As a youngster, the tube circuits I built (AM radio) invariably used contact bias. The grid leak resistor was always 2.2 MOhms, even on a 6AQ5 "final" which had supplementary cathode bias. Obviously, my experience was not HIFI, but my memories of a 6AN8 using the pentode as a grid leak detector and the triode as a driver for the 6AQ5 are clear. The thing worked fine with no cathode resistor on either section of the 6AN8. IMO, it's definitely worth a try.

Eli D.


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