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6.2.2. EL34 Bias Levels

There is no separate bias adjustments for EL34 tubes, but the push-pull symmetry is

important. With a multimeter at lowest DC volt measurement setting, insert black and

red probes into blue sockets. The adjustment point is in between the EL34 sockets.

You should try to get 0.0V or near by turning the adjustment pot with a small flat

screwdriver. If you cannot cross the zero value (i.e. you only get positive or negative

values in entire adjustment range) you should turn off the unit, wait until tubes are

cooled down, swap EL34's and repeat the adjustment procedure above. This

happens when one of the EL34 tube gain is very different than the other one. If

swapping the tubes does not solve the issue then you should replace at least one of

the tubes or install a gain matched pair.

ABSOLARE Push-Pull Amplifier User Manual 0.9