F*nder stand alone reverb type clone

[phatmateo]

anyone have any schematic that similar to this?
http://guitars.musiciansfriend.com/product/Fender-Vintage-Reissue-63-Reverb-Amp?sku=480553

I have an empty guitar amp head and can fit a pretty big tank in there....might be a fun project so I dont have to rely on my line 6 verbzilla haha.  I tried searching the forums, but couldn't find any schematics

Thanks!

 

[Gus]

type fender reverb schematic at google

http://www.schematicheaven.com/fenderamps/reverb_6g15_schem.pdf

http://www.ampix.org/albums/fenderamps/63_reverb_manual.pdf

 

[phatmateo]

haha I should have just done that.  I'm sorry!  Thanks for helping out Gus.  At least this post is here now so people like me will find it when searching

 

[phatmateo]

Has anyone used these?  Are they noisy?  Does anyone know any more specifics on what output transformer can be used?  Im looking at just using a champ power transformer, but I'm having trouble finding info on the 04605 XFMR REVERB DRIVER OUTPUT thats listed in the reverb manual parts list.  Sorry I am new to building tube gear from scratch so any help on what to look for is appreciated.  I do understand the high voltages I'd be working with though!

 

[pH]

You can get all your transformers at tedweber/tubesandmore/angela.com, but any single ended 6V6/6AQ5/6BQ5 OT should work.

My scavenger version (in a fancy Weber chassis) sounds fantastic.

 

[Sleeper]

mine two, I like it alot alot alot.  definately check the ted weber schemos and layouts. they work.  I scavenged power transformers from an old tube tape recorder and realized I had an output transformer and some small alnico speakers I could also pull off of that.
It had enough B+ and enough heater voltage to run 2 more tubes so I went for a firefly type amp on the tail end.
I have it so I can switch the firefly into standby mode.
You would- or wouldn't- be surprised to know that having a little speaker in the same cabinet as the reverb tank gives you a much wider variety of tone out of the thing. crank the amp and the dwell control and the tank starts to feedback a touch.  mmmmm yummy.
turn off the speaker and your nice and boingy.

 

[KickBack]

There are basci only two types of springs.

The standard Fender types have a 8-ohm input coil, and a 2000 ohm output coil.

The 12at7 reverb driver drives a small output transformer that has a 8-ohm secondary winding.

So the Fender Stand-Alone reverb uses a 6v6, 5K to 8 ohm out amp, then a 12ax7 to gain the output back up.

The Dwell control turns the drive to the springs down, and the gain out up.

The less you drive the springs, the "Longer" the reverb time, or Dwell is.

You can take a small amount of the signal from the output of your amp, drive the input of a set of springs, and then feed the output into anothe channel. Hammond Organs take some of the signal from the main amps speakers, and drive the reverb springs, then the out from the springs goes to a small amp that drives a small speak for reverb.

You could drive the springs with one amp, and feed the springs to another small amp.

The other type springs are 2000 ohms both sides so a Op-Amp can drive the springs input.

The original Fender sprongs used a 6k6 tube, there are lots of them around, only need 200 volts + to run them with.

gEo

 

[RayBlack]

I'm currently building one myself too, based on:

1 Accutronics 9AB3C1B
and the basic circuits from
http://sound.westhost.com/articles/reverb.htm

The spring is the 8R/2,7kR version with up to 4s of reverb
and will be used in studio rather than on stage.

In the long term will upgrade to tube circuit, if I'm
more familiar with them

Greets
Ray

 

[walter]

I have built a stand alone reverb based on the super reverb type circuit. It uses a 12at7 thru a small driver transformer to feed the tank. (The Gibson and Ampeg circuits use the "other" type of reverb tank, and don't use the transformer.) From a cost standpoint, you could design the circuit based on what components are readily available. I wanted to create a Re-Vibe with vibrato switchable pre/post to the reverb, it sounds really cool! Although I don't get the sound of the 6V6, I did incorporate the three knob dwell/mix/tone circuitry. Another option, if your going to have an amp as well, is to connect the reverb tank as you would a negative feedback circuit and add a pot after the tank, super simple, Gibson did this on one amp that I know of.

 

[ward]

I have built one based on the hoffman revibe;
http://www.el34world.com/Hoffman/images/revibeschematicToreT.gif

I could post pictures if you like.
It sounds very cool.
Until I connect the mains earth, then it sounds cool with a HUMMMMMM......

I'm curious to what people here find the best approach on breaking the ground loop:
- a la the fender reissue ?  With back to back diodes, and two 15 ohm resistors.
    (not so simple for me since my pots earth the signal.  And the coax connectors to the tank needs to be isolated too ?  )
http://www.ampix.org/albums/fenderamps/63_reverb_manual.pdf

- with an isolation transfomer ?   And what transformer would do the trick ?



[edit] I used the fender method, and I'm totally satisfied with the noiselevel.

 

[Gus]

Why not design one using solid state?  I can think of a few ways to do it.

 

[phatmateo]

I am gathering parts to build a solid state driver and recovery circuit for now.  I'll update my progress in this thread