Q23 à 2SJ406
Q24 à 2SK2378
Q25 à 2SJ406
Q26 à 2SG4449 E,F
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To stabilize operation of the amplifier, turn ON the power with No Input signal and wait for 1 to 2 minutes in non-loaded condition before the adjustment. Adjust VR1, so that the voltage between the terminals TP1 & TP2 is DV 50mv to 250mv.