Absolare Push-Pull Podręcznik użytkownika - Strona 12
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Drukuj stronę6.2.2. EL34 Bias Levels
There are no separate manual bias adjustments for the two 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 tubes. You should aim for as close to 0.0V as possible 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 will occur when one of the EL34 tube's 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 use a 'gain-matched' pair.
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ABSOLARE Push-Pull Mono Amplifier User Manual 1.2