[AMPS] 3cx1000a7 bias

[a.p.]

Hello,
I am building a 6M amp and currently deciding on a bias
switching scheme. I note in the SB-220 they use a rather
high resistance in the zener bias circuit and switch the
relay from the 110 (or so) VDC bias line. I see on other
amps that the relay is used as the series dropping resistor.
It seems to me the latter is more efficient though it
requires a higher wattage zener. Are there any other points
to consider?
Art  K3XF


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