Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Diverted on September 20, 2018, 12:52:26 pm

Title: Fender AB763, no tremolo question
Post by: Diverted 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

Title: Re: Fender AB763, no tremolo question
Post by: SILVERGUN 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.

Title: Re: Fender AB763, no tremolo question
Post by: sluckey 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.

Title: Re: Fender AB763, no tremolo question (Link does not work)
Post by: ToneJunkie 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:

Title: Re: Fender AB763, no tremolo question
Post by: 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.

Title: Re: Fender AB763, no tremolo question
Post by: 66Strat 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"

Title: Re: Fender AB763, no tremolo question
Post by: sluckey 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

Title: Re: Fender AB763, no tremolo question
Post by: 66Strat 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.

Title: Re: Fender AB763, no tremolo question
Post by: ToneJunkie on January 02, 2020, 02:00:07 pm

Thanks for the Link!

Title: Re: Fender AB763, no tremolo question
Post by: kagliostro 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