Absolare Push-Pull Manuale d'uso - Pagina 11

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6.2.1.  845  Bias  Levels  
You have to adjust left and right 845 tube bias levels separately. Measurement is
done via a multimeter at 2V DC (or 2000mV DC) setting. Insert black (-) probe into
black socket and red (+) probe into one of the green sockets. You should read a
value about 0.45V (450mV) for each tube. If the readings are different, then adjust
the bias level via potentiometers near the EL34 tubes. A small flat screwdriver will be
necessary to access internal bias pots.
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ABSOLARE Push-Pull Amplifier User Manual 0.9