Super Reverb Leslie Driver Rebuild

[Reeltarded]

Is I think '78 model.. has master and UL OT. We used it as the proto amp for a Leslie kit in the 88-89 period. Leslie is powered from accessory outlet, feeds from similar to a line out arrangement, and has a cool custom pedal with REV/VIBE moved into it and includes CANCEL for Leslie plus a half moon switch for Leslie control on the front. Booyah!

Ok. Here we go.

Subtractions:
The Normal channel. Will be discussed below.

Vibe circuit. Byebye!

Additions:
Normal channel is a three knob tube (au7) drive to act as FET input in Dumbles Controls are Gain, 6position Brights/Cuts, Single tone control Bright switch becomes a coupler selector. (500p/.047)

Vibe circuit becomes two sections of OD. Vibe controls are OD1 and OD2. Easy. Probably leave stock labeling lol

Reverb reconfigured to be lush and amazing. 4 triodes to work with. What is the best verb setup for that?

Zero Loss fx loop pre reverb send.

Changes:

OT and PT go BYEBYE in favor of a 400v PT and silicon rectifier. 3k7 OT with multiple secondaries for 4/8/16 with local being 8R. (series/para speaker rig) I will use EL34s if I can do it without rattling.

Move all controls to a new pedal and modernize the wire.

Recover and cloth for cabinet. New extra fancy faceplates.

I need help with the reverb circuit choices. I am going to go read about FET switching in Dumble section and do that. Needs channel, FET, and maybe slope switching added. My pedal is going to be as big as a tweed Champ.

Reverb ideas, and don't be shy. 4 triodes and 6" of board space.. let's go!!

[martin manning]

Reverb ideas, and don't be shy. 4 triodes and 6" of board space.. let's go!!

Four triodes is the typical Fender AB763 arrangement: Parallel 12AT7 triodes driving the reverb transformer, then two 12AX7 recovery stages.

[Reeltarded]

I want to do something different if better

[sluckey]

The Vibro-King is quite different. Kinda like having a 6G15 built in. Don't know what it sounds like but expect it is lush.

https://el34world.com/charts/Schematics ... manual.pdf

[Reeltarded]

I remember when I was a lush. I remember liking the reverb on those amps. Good suggestion!

I forgot to add the unused au7 triode from the normal channel. 5 triodes.

There are lots of places and space to add controls. The verb control could be a return and I could add a send with a tone control and a tone for the return on the back. I wish the chassis was even a teeny bit taller.

Don't be shy. I don't want to wish I did something we didn't think of.

I am Super Excited!

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[Reeltarded]

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Dirty dirty

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[didit]

I repeat myself -- look into http://www.channelroadamps.com/articles/reverb_driver/ -- having made the reference more than once in the past. It uses commonly available though only in NOS a Noval 9 with a pentode/triode pair. Avoids the classic Fender transformer, and has depth and capable of drip. Having prototyped this I confirm it works well. Finally into production here soon as it will be the reverb in my winter project, a Princeton scale AB763/Dumble inspired combo.

Might taste good. Look at least for enough time to understand and decide.

Best .. Ian

[Reeltarded]

Ian, that is pretty crazy. I never saw this mentioned!

Thanks for pointing it out!

Even better than the best! Miles

[didit]

To go McKinley Morganfield on you --

Another similar approach would be to scrape the reverb circuit from that late monster, the "Super Twin". A 6CX8 pentode/triode too, but drives stock reverb transformer. See the schematic hanging off this page -- https://ampwares.com/amplifiers/fender- ... in-reverb/.

Stir a few more times for ideal turbidity, my current schematic sketches have tweaks to the Channel Road CC driver to use a 6CX8. That's all untested so uncharted waters.

Best .. Ian

[Reeltarded]

my ears ring, still..

[TUBEDUDE]

Driving the verb xfmr push pull will give it a more transparent and dynamic sound than the standard PSE approach. Bonus if the recovery stage is sent to the P.I. second input directly (of course that means no feedback at the P.I.).

[didit]

Driving the verb xfmr push pull will give it a more transparent and dynamic sound than the standard PSE approach. Bonus if the recovery stage is sent to the P.I. second input directly (of course that means no feedback at the P.I.).

Yup. Broad agreement with this observation, somewhat dependent on some circuit details. Suggest you'd also find the constant-current capacitive-coupled circuit posted earlier has similar desirable dynamics.

Since I'm back again, could add at least one more single Noval 9 option using 12DW7, which is aptly explained in this TAG thread -- https://ampgarage.com/forum/viewtopic.php?t=31498. Doubtful drive current from that tiny triode meets an imperative

to be lush and amazing

..

[Reeltarded]

The current driven thing is fat and gives a lot to work with. I really liked that best, so far.

[TUBEDUDE]

You've got current to play with, how about an ECC99 driver?

[Reeltarded]

I have a question about future proofing amps. I think the only manufactured rubes in the end will be 6L6 EL34 and 12ax7s.

You are all going to kill me when I tell you what I think I decided.

(prepare for me to say I think I am going SS on the reverb.. calm down.. it will be ok.. please don't kill me)