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Re: Powerampdist. in guitaramp

That amp was designed around 6CA7, the fat-bottle, American equivalent of EL-34.

It's confusing because some tubes have both designations.

The tall skinny (true EL-34's) will self destruct in that amp due to the high plate voltage.

You need true 6CA7's for reliability.

The waveform you describe is crossover distortion. If the amp is correctly biased, it should not be present. Factory specs call for 0.5V across the 10 ohm cathode resistor. That translates to 25 mA/tube.
Hope this helps! Al


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