Back in the 1970s, maybe around the 1975 timeframe, I recall Dad getting a book named "Amplifier Circuits" kind of the size of a special edition magazine of those times and it had some kind of a brown design (like a PCB) on the front and back cover (cant recollect firmly which volume it was but faintly recollect that it was either volume-1 or volume-2). This amplifier book basically contained circuit diagrams, mostly hand drawn, of the public address amplifiers of those times, with Indian brands like Ahuja, Harman, Roxy, etc. This book contained circuits of both valve and amplifier based circuits. I had this book lying somewhere at home, but searched high and low for it today, without luck. Unfortunately it seems to have disappeared, probably with old books and news papers to the Kabbadi wala.
I am specifically looking for this book or schematics from similar books for PA Ahuja valve amplifiers in the 10 watts, 15 and 20 watts range with output powered by 4 x EL84. Specifically, the schematic of Model TM-50.
Any help or guidance would be like gold dust and is much appreciated. Thanks in advance.
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