Swart 12DW7 Reverb

[jhawk]

Has anyone traced a Swart reverb schematic before? The AST and a few of their other amps (maybe all of their reverb amps, not sure) use a transformerless cap-coupled reverb with a 12DW7, the AU7 side to drive the tank, AX7 side for recovery.

I’d like to use this circuit in a personal project. I’ve never heard anyone say they thought the Swart reverb sounded bad...

[coldengray]

I have a gut shot somewhere of my old Swart Tremolo. I’ll see if I can find it and post.

[jhawk]

Many thanks!

[tubeswell]

Some transformer-less reverb driver suggestions 1/2-way down the page in this link:

http://www.valvewizard.co.uk/reverbdriver.html

You could just go ahead and adapt that for 1 x 'AU7' driver triode

[frankdrebin]

there is a schematic around,if i found it i'll post it here

[martin manning]

The text is a bit fuzzy, but here’s one: http://www.tdpri.com/threads/swart-ast.551853/

[jhawk]

Thanks for the replies guys.

The text is a bit fuzzy, but here’s one: http://www.tdpri.com/threads/swart-ast.551853/

Looks like this is originally from this thread:
https://music-electronics-forum.com/sho ... hp?t=22699

Sounds like the poster did copy it from a Swart (although he never comes out and says so). Pretty large load resistor on the recovery stage.

I also found this 12DW7 reverb on another forum:
https://el34world.com/Forum/index.php?topic=21991.0

It calls for a reverb tank that is interchangeable with the schematic up above. Between these two, I should be able to come up with something that sounds decent!

[FUCHSAUDIO]

Ampeg did this (6FQ7), as did Traynor (EL-84) with cap coupled reverb drivers. With a hi impedance input pan, it’s not difficult to get a nice reverb going.Swart hasn’t reinvented the wheel...