Re: Quad 22 KT66 to 6L6 with Cathode resistor increase?
5B/254M is often spoken of as an 807 in a smaller bottle, and the 807 spoken of as a 6L6 with top cap, ceramic insulators and a bit more space... same characteristics but allowed to extend higher in voltage. I've always understood that the 6L6 was derived from the 807 but not come across evidence.
The KT66 has differences, but were they deliberate to throw Philips' lawyers off the trail of beam tetrodes and kinkless tetrodes impinging on their power pentode patents. And vice-versa.
Waters were deliberately muddies.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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