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Hoffman Amps Forum image Author Topic: power TX w/o center tap and tremolo  (Read 1927 times)

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Offline isaac_teller

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power TX w/o center tap and tremolo
« on: May 12, 2021, 01:12:19 pm »
Hello again. I'm building a Blackface Deluxe clone. The power TX doesn't have a center tap(full wave bridge rectifier). I have no problem obtaining the bias voltage from one leg of the AC secondary but how would I implement the tremolo? Thank you.


http://www.prowessamplifiers.com/schematics/fender/deluxe_reverb_ab763_schem.pdf

Offline pdf64

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Re: power TX w/o center tap and tremolo
« Reply #1 on: May 12, 2021, 01:16:51 pm »
What do you perceive to be the sticking point?
https://www.justgiving.com/page/5-in-5-for-charlie This is my step son and his family. He is running 5 marathons in 5 days to support the research into STXBP1, the genetic condition my grandson Charlie has. Please consider supporting him! BBC News feature  https://www.bbc.co.uk/news/articles/cm26llp

Offline isaac_teller

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Re: power TX w/o center tap and tremolo
« Reply #2 on: May 12, 2021, 01:27:40 pm »
There's no 50 volt tap. I'm using this bias circuit. Everything works out except the cap connected to the 2M2 resistor


http://www.valvewizard.co.uk/cap_coupled_bias_supply2.jpg
« Last Edit: May 12, 2021, 01:30:32 pm by isaac_teller »

Offline pdf64

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Re: power TX w/o center tap and tremolo
« Reply #3 on: May 12, 2021, 02:05:11 pm »
Take that feed from the raw bias supply, the -ve end of C2.
https://www.justgiving.com/page/5-in-5-for-charlie This is my step son and his family. He is running 5 marathons in 5 days to support the research into STXBP1, the genetic condition my grandson Charlie has. Please consider supporting him! BBC News feature  https://www.bbc.co.uk/news/articles/cm26llp

Offline isaac_teller

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Re: power TX w/o center tap and tremolo
« Reply #4 on: May 12, 2021, 02:21:20 pm »
Thank you very much

 


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