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eHam Forums => Amplifiers => Topic started by: HA5RXZ on October 03, 2006, 05:44:18 AM



Title: Why is ALC A Negative Voltage?
Post by: HA5RXZ on October 03, 2006, 05:44:18 AM
Something I've often wondered but never thought of asking. When an amplifier supplies an ALC signal why is it always negative with respect to chassis?

HA5RXZ


Title: Why is ALC A Negative Voltage?
Post by: K0BG on October 03, 2006, 08:06:14 AM
A way back, when tubes were king, the ALC voltage was derived from the grid bias which was negative with respect to ground. It stuck.

Alan, KØBG
www.k0bg.com