Will I lose friends over this? :) Jose mod questions

General Tech Discussion - Anything amp-ish goes!

Moderators: CurtissRobin, colossal, zaphod_phil, Daviedawg, Graydon

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colossal
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Re: Will I lose friends over this? :) Jose mod questions

Post by colossal »

The Chupacabra is a great sounding design. I built a 100W version way back when. Very warm sounding amp and the distortion was smooth. The 430k boost stage made it a bit more complex (and distorted).
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wmwelch55
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Re: Will I lose friends over this? :) Jose mod questions

Post by wmwelch55 »

The power section in mine uses a 6.6K OT and is cathode biased. I can use 6L6, 5881, EL34 without a need to re-bias. I like the Tung-Sol 5881s the best. They seem to bring out the harmonics created by the the preamp.

As I mentioned earlier, I built two of these. One uses a 275-0-275 transformer and the other one uses a 300-0-300 transformer. Both are identical except for the Power Transformers. The one that uses the 300-0-300 transformer was a bit brighter than the lower voltage one. The lower voltage one sounds the best when cranked.

Mike
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wmwelch55
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Re: Will I lose friends over this? :) Jose mod questions

Post by wmwelch55 »

My lower voltage version of that amp has a plate voltage of 340 volts and was measured at 20 Watts into an 8 ohm load. I haven't measured power output of the other one, but it has a plate voltage around 360 volts. I am very pleased with both of them.
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