The 5763 was intended for RF service as an osc, multiplier, driver, or class C amp. But I see no reason why it could not have been used for class A audio. It had plenty of plate dissipation. I don't know how it would perform distortion-wise as its linearity didn't matter for the RF applications. It would just cost more for doing the same job as the 6AQ5.

Dennis AE6C

On Sun, Nov 14, 2021 at 3:55 AM <releazer@earthlink.net> wrote:

I believe that the 6AQ5 was used a Class A audio power amp? Was the 5763 ever used that way? I believe that the ARC T-11 and T-13 VHF transmitters used the 5763, and I guess that means that it was used as an audio power amp.

Wayne'
WB5WSV
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