And if the power output was 20% higher than normal of the G2DAF design, that
is a sign that the amplifier was overdriven. Since the plate efficiency is
no different than the "standard" configuration, greater output indicates
overdrive. Simply reducing the drive to get the same power input and output
would have reduced the distortion.
I can increase amplifier distortion on any amp that it at the normal limits
by overdriving it. This is another way to assure failure.
So, the amplifiers you listened to were being overdriven and used tubes that
you say were poor tubes to use in grounded cathode linear service. Good
tests!
Did they also use power supplies that sagged 50%?
Colin K7FM
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