Tube reverb project

[Colas LeGrippa]

Hi ,


I got rid of my cathedral digital reverb.
Was sounding ok for the guy who bought it hey hey.
Now I want to build the real thing, all tube spring reverb. I got a bunch of trannies, a chassis and other components that are sleeping in my dusty drawers. Which model should I build ?


Thanks

[MakerDP]

Once upon a time I built a cool little push-pull reverb using two 12AX7's as kind of a cross between the Firefly and a design in one of KOC's books. Sounded good.

[sluckey]

Is there more than one?

[Colas LeGrippa]

According to MakerDP there's aother model than the Fender one

[jjasilli]

https://www.anatomyofguitartone.com/home/a-brief-but-complete-guide-to-guitar-reverb

[PRR]

I'm going to tack this here. Philco's 1961 reverb for home stereo.

I have seen this cross-cathode dry path (but mono) in some guitar amplifier.

Still seems to me like more parts than needed.

[Williamblake]

I would like to try this some day: https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.valveheaven.com/2016/10/the-lamington-reverb-an-easy-to-build-valve-reverb-unit/&ved=2ahUKEwia7qOS9fTlAhUQ66QKHci7DqkQFjAAegQIAhAB&usg=AOvVaw3496UPiORjlgGxvMQq9nUE as EF80 is cheap and it has no transformer.
I don't know the reason for the recovery stage in any reverb having a grid stopper. Would be testing that tomorrow but seriously why?

[Colas LeGrippa]

Very interesting indeed
Thank you guys


Colas

[MakerDP]

I'll try and dig out my design. I'd say go to the AX84 forums and look it up... but... yeah... can't do that anymore... 

It might be on my old blog.

[MakerDP]

Here ya go...  http://www.1darren1.com/2014/05/designing-all-tube-push-pull-stand.html
(This design is a great intro into the world of all things self-split. That's a fun rabbit hole that is under-explored IMO. I have a couple really nice self-split designs for power amps. It has a couple other tricks up its sleeve too... like the first-gain-stage/non-inverting-zero-gain-mix-stage in one triode.)

There is also this super-cool reverb design... https://www.modkitsdiy.com/kit/wave
I built that kit. Very nice rich reverb. What's cool about the kit is that if you end up not really digging the reverb it makes a great stand-alone preamp or D-Lator w/verb platform.

[kagliostro]

Ciao Colas

This is different but I don't think you want to build your own spring tank unit



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Read here about the patent and the tank Vox used

http://www.voxshowroom.com/uk/misc/reverb_hood.html

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Franco

[Colas LeGrippa]

Grazie mille Franco sei com un padre per me...
My spanish is much better than my italian...


I think there are simpler reverbs than the Vox one but iit s worth take a look at it

[sluckey]

Here's a dead nuts simple reverb...

You need a second small guitar amp, champ would be fine, but any amp will work. Call it the reverb amp. You also need a Fender style reverb tank, 4 to 8Ω input, high z output. Play guitar through main amp. Connect reverb tank input to the speaker of your main amp. Connect reverb tank output to input jack of the reverb amp. You won't be disappointed.

If you like the sound you may consider mounting the reverb tank inside the reverb amp. Then you only need a speaker cable to connect the tank input to your main amp. Tank output is connected inside the second amp.

[kagliostro]

As Steve say



this Gibson has the reverb tank but require one other amp to drive it

Franco

[Colas LeGrippa]

I ll sure give a try to Sluckey's suggestion B4 getting into a time consuming project, since I have a couple of amplifiers laying around.


Thanks guys for comments, links and schems.
Really appreciated.


Jack

[SILVERGUN]

If you absolutely have to have the best reverb you better get busy pouring concrete:

[shooter]

I'm at war with my computer for CONTROL so audio is shutdown, the photographer pulled off (or doctored in SW:) a great shot, light, shadow, unfocused shot of Christ, coloration, I can already hear the reverb 

thanks for waking up n sharing 

[sluckey]

Colas, I would start off with a series connected 25Ω to 50Ω resistor between the amp speaker and the reverb tank. I would also experiment with series coupling caps. You really only want to send high frequencies to the tank. Kinda like a simple hi freq crossover.

[kagliostro]

Ciao Colas

if I can, this will be my suggestion (as you are going to do something that is very similar)

Build a small stand alone chassis & cabinet

put inside the tank and other components as to be used with a driver amp to obtain reverb to go to the imput of your amp

and .....

as you are really near there ....

put the components you need to use this standalone chassis as to obtain also an Herzog output from the same device (really few components)







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SILVERGUN experimented with the Herzog and build a nice unit

http://el34world.com/Forum/index.php?topic=16934.msg168118#msg168118

Franco


p.s.: Does someone remember which was a stereo guitar amp that had the output of one channel connected to the imput of a tank and the output of the tank to the other channel ???

[shooter]

which was a stereo guitar amp

don't know on reverb, the SET amp did kinda that with the echo unit,  "possible" to use as an example 

[sluckey]

This...

     https://el34world.com/charts/Schematics/files/Ampeg/Ampeg_et1_echotwin.pdf

[shooter]

yup, just too lazy to look it up 

[kagliostro]

Many Thanks Steve

Franco

[Colas LeGrippa]

Everything's hooked up right now, sounds amazing !


From the OT 8ohm tap of my main amp and right into the reverb tank 
and from the reverb tank out to a pp 6V6 connected to an alnico speaker.
Much better than a digital reverb that s for sure.
The reverb comin' out from a different amp than the dry signal gives a very interesting dimension
and.improves my tone by 50 %. ( according to my tone dimension meter... )

[sluckey]