type reverb

[sergio]

I want to add a reverb to my amp-project dumble, can I use basic schematic of the fender twin reverb?

I have seen also schematics with one tube , what the differences?

Thanks

[phsyconoodler]

The two-tube fender style reverb will be hard to use in a dumble circuit.It is better to do a one tube reverb.hat way it won't get washy when you hit the overdrive.I use a one tube reverb in my builds and it works great.

[sergio]

Hi Phsyconoodler , You can send to me the schematic or layout of reverb one tube?

You can post in PM o Email. sergio.assolari@simail.it

Thanks for all
Sergio

[Bob-I]

Here's the onme tube reverb the Glaswerks uses. http://glaswerks.com/schematics/reverbcir.jpg

I've used it in place of the Fender type and it sounds better to my ears. The Fender 2 tube is simply too much. You can adjust R1 to a higher value to get more reverb. I have a 470K in one amp and it goes from subtle to surf. The 100K Gary shows is a very nice subtle reverb.

[hellhound]

I´ve been planning to use the old transformerless Ampeg reverbrocket circuit modified to 9-pin double triodes in my D-inspired built in the near future... Does anyone here have an idea how the mixer will behave with OD switched on?

[sergio]

Thanks Bob , I think I'll try to build your reverb .

[Bob-I]

Thanks Bob , I think I'll try to build your reverb .

Let' give credit where credit is due, that's Glassman's reverb ckt.

I did develop a reverb ckt using an ECL-86 pentode / triode tube. It sounds great, but in retrospect it's not much different than the 12AX7 reverb which is much easier to implement.

[sergio]

I'll use the 12ax7 , but what do you think of 12at7 ?

Have you never well-tested?

Thanks

[skeezbo]

Bob-I,
What is the value of R10 in the Glasman reverb schematic?
Thanks,
Lou

[Bob-I]

Bob-I,
What is the value of R10 in the Glasman reverb schematic?
Thanks,
Lou

That's a good question. Maybe Gary will see this thread and answer.

It's seems to me I used 10K. The other unasked question is where do you get the voltage from? I took mine from the screen supply, added the 10k and a 22uF cap as a decoupler.

[heisthl]

The resistor depends on supply voltage - you can make the plate voltage as high as you want but too high will cause "crackling" in the reverb sound. I've seen 2 tube reverb amps with 450V on the driver tube!. My experience has been to keep the driver side under 400 but over 300 on the the 1 tube style and around 250v (at the plate) on the recovery side. If you have the room the 2 tube setup (12AT7 driver 12AX7 recovery) is vastly superior to the 1 tube and works nicely with the Dumble circuits.

[glasman]

For R10 I usually run a 27K 2W resistor. I also bypass the transformer side to ground with a .1uf cap. That greatly improves the reverb.

As far as the mix resistor. In that circuit I have tried values from 100K to 470K. But I find that I lose top end with the larger R values.

I actually do not use this circuit on my newer amps.

Gary

[sergio]

For Heisthl

Bob wrote:The fender 2 tube is simply too much, and phsyconoodler said:the 2 tubes will be hard to use in a dumble.

What do you think?

[glasman]

For Heisthl

Bob wrote:The fender 2 tube is simply too much, and phsyconoodler said:the 2 tubes will be hard to use in a dumble.

What do you think?

Take a look at the Fender Prosonic. That style should work.

Gary

[heisthl]

Yeah - the print I included is a Prosonic ripoff with minor changes, I have used it in many DClones. It is far and away the finest sounding reverb I've heard. Much better than Black or Silverface Fender styles. Note the reversed transformer leads to keep the correct phase if you choose to incorporate it into your build.