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Hoffman Amps Forum image Author Topic: Bias Wiggle Tremolo with 7591?  (Read 254 times)

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Offline dwinstonwood

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Bias Wiggle Tremolo with 7591?
« on: August 27, 2025, 05:41:13 pm »
Hey again, another question.
Everything I read about the 7591 says it's an easy tube to drive, like an EL84 or 6V6.
I've had great success using Bias Wiggle Tremolo with those two tubes. Shouldn't it work well with 7591's, too?
If not, do I really need to go with the AB763 Roach?

Thanks!
David

Offline SEL49

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Re: Bias Wiggle Tremolo with 7591?
« Reply #1 on: August 27, 2025, 05:53:10 pm »
Works very well. Look at this...

     https://sluckeyamps.com/hammond_2/AO-63.pdf

Should work fine with cathode bias too.

Offline dwinstonwood

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Re: Bias Wiggle Tremolo with 7591?
« Reply #2 on: August 28, 2025, 07:54:43 am »
Thanks SEL49!

And, thanks for the schematic. I'm actually planning on using a Cathodyne PI, too!

David

Offline Sonny ReVerb

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Re: Bias Wiggle Tremolo with 7591?
« Reply #3 on: September 03, 2025, 02:11:40 pm »
I used a Princeton Reverb trem with a 7591 PP fixed bias power section. It works very well.

Offline dwinstonwood

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Re: Bias Wiggle Tremolo with 7591?
« Reply #4 on: September 04, 2025, 12:49:55 pm »
I used a Princeton Reverb trem with a 7591 PP fixed bias power section. It works very well.

Interesting, my initial "schematic-sketch" resembles a PR front end. I didn't intend it to.

 


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