Add reverb to plexi

[maks_michael]

Is there anyone have an idea or schematic for adding reverb to a plexi style circuit.I had rewired my JCM 800 4211 combo to a plexi 1959 , so i have aready my reverb tank ,transformer and 2 free holes for extra tubes.

Thanks!

[GraemeSP]

Try the reverb in the 4210 - or the 2040. Schematics for both are readily googled.

I think I managed to upload the file

[GraemeSP]

Hey , it worked. Here's the 2040 schematic as well.

V3a is the delay line driver, V3b the recovery amplifier. 1M pot on V3b is reverb depth.

The input is from the 0.047uF cap after V2b, the output comes from the 470K resistor after 1M reverb pot wiper. The 1M resistor mixes dry signal with the delayed signal. To bypass the effect, short the grid of V3b to ground.

Have fun and watch for that HT.

[Tubenit]

I have used this reverb on numerous amps always with success. It does NOT get into the Fender surf zone but does have great reverb to it.


Plexi 25 w reverb w/ MTS picture by tubenit - Photobucket

It uses a standard fender trannie and tank as would be found on a Princeton Reverb

Idea came from the guys building the D'Lite amps.

I have it installed in all 3 of my current amps.

With respect, Tubenit

[txstrat]

Tubenit
I wonder why you've drawn a 220k in between R1 and R2 in this case. If I remember correctly you've drawn 100k resistors in your other schematics.
Is there a reason I don't get?
BTW I will definitely use your kind of reverb in my next build.

[Tubenit]

That schematic just happen to have that value in it. I think my builds actually have 100k-150k values and usually 100k. Any of those values will work though.

With respect, Tubenit

[txstrat]

Any of those values will work though.

With respect, Tubenit

Yeah, I thought so. Compared to the fender value of 3.3M in most cases, either the 100k or 220k wouldn't make a big difference. I believe that the way with a 100k resistor would attenuate and damp the signal much less (than 3.3M) and therefore leave the sound more like a preamp with no reverb. Good thing IMHO. Although I haven't tested it yet.