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Thunderbird Club

Thank you so much my bass brother! Working a painting job today, recording studio outside of Buffalo NY. 1 hour 20 min. commute one way, up at 5AM on the road at 5:45. No complaints I am grateful for the work.
Happiest of birthdays and years, my friend!
 
The DR201 switched to KT88 in the early 70's I believe...

MHuss Hiwatt Amplifier Pages - Detail Views

https://www.premierguitar.com/articles/22263-ask-amp-man-taming-a-hiwatt-dr-201

"According to schematics I’ve perused, Hiwatt apparently produced two versions of the DR-201: One with six EL34s in the output stage, the other powered by four KT88s. Theoretically, the four-KT88 model is more capable of producing the 200-watt stated output than the six-EL34 version, which would probably be closer to 150 watts.

But I don’t believe either configuration actually produces 200 watts of continuous power. The power supply design in both amps should be identical, and while the stated 650V DC plate voltage should be more than ample to support a 200-watt amp (given enough current capability), the power supply only provides 410 volts to the screen grids of the tubes."

KT88s came first, starting in '68, the DR201 switched to the 6xEL34s in around early-mid 1975.
 
Thank you so much my bass brother! Working a painting job today, recording studio outside of Buffalo NY. 1 hour 20 min. commute one way, up at 5AM on the road at 5:45. No complaints I am grateful for the work.
...and a big B'Day shout out to you!
Work (with pay) is always a good thing, but I hope you get some quality time for yourself as well on this special day. Some time tonight with a beer and a bird is probably well deserved. Have a good one!
 
Thunderbird and Cat butt.

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