Quote:
Originally Posted by PYE 405
As you probably well know, Peter Walker had an alternative solution back in 1952 with the Quad II output stage.
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First use of the Quad distributed loading circuit was in the Acoustical M31 and MB31 PA amplifiers of 1945:
Although it was noted that a patent had been applied for, so far, I have been unable to establish that a patent was actually issued.
The first “hi-fi” use was in the Acoustical QA12 amplifier of 1947:
Quad claimed that its circuit allowed the use of different anode and screen voltages without the complication of separate transformer windings. That claim was made in the third page of the attached article.
Cheers,