![]() As this amp is contemporary to book's publication, look at it with doubt. The stereo gallery Q 300b amp is presented in Jean Hiraga's book as 20watt with 1% distortion and 6db NFR if I do remember well, but in his book most circuit diagrams are purposely modified to bypass copyright problems. Nowadays Shuguang produces 60watt version of this tube as 300B-C and the prestigious 300B-Z costing 110USD + shipment from Leisure_audio. If the life cycle of WE300B 10000hrs is reduced to 5000hrs ,150USD costing by then in 80's was still a bargain if it attracted more customers. To remind that this is a professional use amp intended for Japanese tea houses where the appreciated item was not the tea but the HIFI sound. If you have a second look at -100v curve, you will see at 450v plate the 300B swallows 100ma blushing 45watts, -98/440v should heat 44watts. The kit quality OPT must retain 10% to deliver 3.6w, as PRR predicted. 54ma/170v-p/4w are values issued from simulation of 300B version of this 2A3 conceived amplifier.
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