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Hoffman Amps Forum image Author Topic: Fender AB763, no tremolo question  (Read 4409 times)

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Offline Diverted

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Fender AB763, no tremolo question
« on: September 20, 2018, 12:52:26 pm »
Hi all,

I'm going to build a Fender AB763 deluxe reverb. Only one channel, and would like to remove the tremolo circuit.
I have never dealt with the tremolo circuit on this one, which uses the optocoupler bug. I'm wondering the best way to remove it.

I know I should re-route the two 220K resistor junction inthe output section to the bias pot.
But the other lead coming off the high side of the intensity pot, that hooks up iwth the junction of the .01uf and 220K, which eventually goes to the second plate of the 7025 ... I don't know If I should just remove this connection, or if I need to modify the circuit in other ways. Any suggestions?

Thnaks!

http://schematicheaven.net/fenderamps/deluxe_reverb_ab763_schem.pdf
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Offline SILVERGUN

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Re: Fender AB763, no tremolo question
« Reply #1 on: September 20, 2018, 01:39:47 pm »
If you'd like simplicity in a proven winner design, look no further:
http://sluckeyamps.com/tdr/tdr.htm

He took all the thinkin out of it for us.

I built one of these and died a little bit when I sold it.
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Offline sluckey

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Re: Fender AB763, no tremolo question
« Reply #2 on: September 20, 2018, 02:24:18 pm »
You seem to be confusing the AB763 DR with another amp, maybe the Princeton Reverb or Hoffman's modified AB763 circuit. The tremolo circuit in a real Deluxe Reverb AB763 does not tie in with the bias circuit.
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A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline ToneJunkie

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Re: Fender AB763, no tremolo question (Link does not work)
« Reply #3 on: January 01, 2020, 11:11:40 pm »
Hey guys I was wondering if anyone had this schematic of Sluckys?  I'm trying to fix an old build of mine  :help:
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Offline sluckey

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Re: Fender AB763, no tremolo question
« Reply #4 on: January 02, 2020, 04:50:35 am »
It's on my website...

     http://sluckeyamps.com/AB763_Lite_II.pdf

My AB763 Lite is the NORMAL channel rather than the VIBRATOR channel.

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A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline 66Strat

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Re: Fender AB763, no tremolo question
« Reply #5 on: January 02, 2020, 12:00:32 pm »
Quote from: sluckey on January 02, 2020, 04:50:35 am
It's on my website...

     http://sluckeyamps.com/AB763_Lite_II.pdf

My AB763 Lite is the NORMAL channel rather than the VIBRATOR channel.

The link does not work. "I get 404 Error - Page Not Found"
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Regards,
JT

Offline sluckey

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Re: Fender AB763, no tremolo question
« Reply #6 on: January 02, 2020, 12:17:32 pm »
Haha! I've been reloading my old website this morning. Try this instead...

     http://sluckeyamps.com/index.htm
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A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline 66Strat

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Re: Fender AB763, no tremolo question
« Reply #7 on: January 02, 2020, 12:31:30 pm »
It's working now. :thumbsup:

Very nice website and very generous of you to share your projects.
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Regards,
JT

Offline ToneJunkie

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Re: Fender AB763, no tremolo question
« Reply #8 on: January 02, 2020, 02:00:07 pm »
Thanks for the Link!
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Offline kagliostro

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Re: Fender AB763, no tremolo question
« Reply #9 on: January 03, 2020, 04:03:41 am »
Quote
.... I've been reloading my old website this morning.

 :l2: :l2: :l2: :l2:

That is GREAT Steve  :thumbsup:

Franco
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