• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Class of operation measuring

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LuisMCP

LuisMCP

Member
Joined 2001
Hello:

How to measure if an PP amp is working in class A?

The amp is cathode biased in Ultra-Linear mode.
Tubes are KT88, Rk = 390 ohm, Vak = 354V, Ia+g2 = 82 mA
and Vg = -32V

Raa is about 6k

On the other hand, i've no find plate curves for KT88 in UL mode.
I've used the plate curves for KT88 in triode mode instead for approximation.

Thanks in advance.
 
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