London Power ad

Search the Forum

(Advanced Search)

Stereo Reverb as in TUT2
Hi all!

I'd like to build the Stereo Reverb as in TUT2.
Has anyone done that?

Which Reverb Block would be best, the one in the LP Standard or the Standalone Reverb Kit?


(03-28-2021, 10:32 AM)Strelok Wrote: Hi all!

I'd like to build the Stereo Reverb as in TUT2.
Has anyone done that?

Which Reverb Block would be best, the one in the LP Standard or the Standalone Reverb Kit?



Some of how you'd choose to do it would be based on what type of signal you'd be handling.  By the "Standalone Reverb Kit"  do you mean the reverb unit shown in Tones or Tone (Fender style reverb driver)?  That one is setup for instrument levels of signal while the London Power style driver in the Standard is meant to be inside an amp but either style circuit could be adapted to a different purpose. What are you wanting to do with the reverb?
Greetings Strelok

We are brothers by the second syllable Smile

Is your question simply about the reverb driver stage? LP push-pull versus the everyday SE? I think Mr.O'Connor's description of the benefits of push-pull driver are all you need to know and then just look at the cost each way. Apparently one can acquire a "Fender" replacement reverb drive transformer for just a few bob and from a plethora of sources. There is a custom reverb drive transformer on the London Power site which is more expensive, although Mr. O'Connor kindly gives you alternatives in TUT2, referring to Hammond's 125A as a reasonable candidate.

One thing, too, is that the reverb path is what Kevin calls a "side-chain", which suggests that maybe the fidelity does not have to as high as in the main signal path? That may not be true for effects loops, but I think it is here? This may influence the transformer choice.

If you are building a stereo reverb for general use then maybe the reverb quality and noise are more important.

Hi Guys!

I wasn't all clear.
The reverb is for general use, like recording line levels mostly.

With the kit I meant REV, the standalone reverb on the site here.
It is Push-Pull, just like the on in the Standard.
It differs some from the circuit in the Standard, mainly that the Dwell pot seems to rest on a stand-off.
I don't know what it is called, but there's a voltage divider that connects to the second grid.
The first grid where the Dwell pot lands is tied to this divider through a 10M resistor.

At first I thought there was a big difference but I omited one resistor in my drawings, so there is not a big difference.

Also, there is a difference at the anode resistors.

I think I will go with the kit. I'll tap the signal from the Reverb pot.

I have some custom LP Reverb transformers so I can do the PushPull scenario.

Thank you very much for your feedback!
Hello Reactors,

I see I did not address all comments and questions.

I built the Fender StandAlone from Tonnes of Tone, there is a volume drop, I heard that's normal when you take the cathode-way out.
I built it to use in front of the Herzog, I don't want to break the chain of that amp, it sounds so good the way it is.

Yes Sherlok we are brothers by the second syllable indeed, you have the gift of noticing things!

I had a reverb Tx from an old Mesa Boogie, I built the Fender with that.
Thank you for mentioning the sourcing Smile

It will be a Push Pull yes.

I will read that part about the side chain, just for fun.


Hello fellow TubeHeads,

I am well on the way of building the schematic of the kit.
However I have a few questions.

The kit has a very high gain. I built it previously from a complete kit.
What would be the best way to lower the gain?
Use a higher Ck at the last stage?

Kevin, I am building this new one on an eyelet board.
I did not order the kit.
What is your view on this?
I mean, it kicks you out of income, I could have ordered at least the PCB.
Originally I ordered the kit so some money would come your way.

Kind regards,


Forum Jump:

Come in where it's warm!
A warm welcome to tube amp modding fans and those interested in hi-fi audio! Readers of Kevin O'Connor's The Ultimate Tone (TUT) book series form a part of our population. Kevin O'Connor is the creator of the popular Power Scaling methodology for amplifiers.
Please remember these three principles: respect, sharing, community.
Not familiar with The Ultimate Tone book series? See discussion topics, or click here to visit London Power/Power Press Publishing.

Tube Amp Forum Hosted by London Power
London Power logo