Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Jack1962 on January 02, 2012, 11:54:04 am

Title: Reverb Circuit
Post by: Jack1962 on January 02, 2012, 11:54:04 am

What's Up

       I am wanting to add reverb to a Peavey Butcher , the original single channel butcher , I have 2 reverb tanks 1- Gribbs Manufacturing & Research Corporation (AO-23580-11) that I took from a Hammond L133 organ and 2- Accutronics (8EB2C18) that came from a Fender Blues Jr. what I need is a tube drive and recovery circuit that will work with either of these tanks . I have built the solid state circuit that goes with the Fender Bluse Jr. tank , however it requires a - and +15 volt power supply there is no voltage even colse to that in the Peavey Butcher.


                                                              Thanks For
                                                               Your Time
                                                              Jack Latham
                                                               

Title: Re: Reverb Circuit
Post by: tubenit on January 02, 2012, 12:28:43 pm

You might want to check this out and see if there is anything you can use from this.

http://www.el34world.com/Forum/index.php?topic=7957.0 (http://www.el34world.com/Forum/index.php?topic=7957.0)

With respect, Tubenit

Title: Re: Reverb Circuit
Post by: Jack1962 on January 02, 2012, 12:44:59 pm

Thanks Tubenit , I"ll give that a try

Title: Re: Reverb Circuit
Post by: sluckey on January 02, 2012, 01:01:57 pm

Your Accutronics unit has Input Impedance 800 Ohms, Output Impedance 2575 Ohms. It won't like any of the tube/transformer coupled drivers. You'll need a cap coupled driver such as in the last example in the thread tubenit posted. Or copy an old Magatone or Gibson cap coupled circuit.

Title: Re: Reverb Circuit
Post by: kagliostro on January 02, 2012, 01:36:36 pm

Here is the schematic of an old Italian amp

GEM Super Deluxe Reverb 50 R

that don't use transformer in the reverb circuit

and uses a 6DR7 and a tube of the 12a*7 serie

Kagliostro

Title: Re: Reverb Circuit
Post by: Dave on January 03, 2012, 06:38:10 am

Ampeg had some really good reverb circuits that didn't use transformers.

Dave

Title: Re: Reverb Circuit
Post by: Jack1962 on January 03, 2012, 04:05:33 pm

Thanks everyone for the great info