Reverb with Dwell, Tone and Mix controls

[frontsideboneless]

I want to adapt the reverb circuit from the Fender Hot Rod Deluxe for use as a standalone effect for use in front of an amplifier (like a pedal).

I wish to have the same controls as the 6G15 Fender Reverb Unit (Dwell, Tone and Mix)

I already have a tank with 600ohm input and 2250ohm output impedance. (I have a 1EB2C1A laying around in a broken amp). This is the same type used in the Hot Rod Deluxe.

The reverb schematic is available here (scroll down a little bit) https://robrobinette.com/Compact_Reverb ... ing_Reverb
(I am confused by R40, C28 and the intersected point.)

Which components would I need to modify to achieve this? Is this even possible?

I would also like to hear any input of what could be modified to make this circuit even better.

Thanks!

[martin manning]

I want to adapt the reverb circuit from the Fender Hot Rod Deluxe for use as a standalone effect for use in front of an amplifier (like a pedal).

I wish to have the same controls as the 6G15 Fender Reverb Unit (Dwell, Tone and Mix)

I already have a tank with 600ohm input and 2250ohm output impedance. (I have a 1EB2C1A laying around in a broken amp). This is the same type used in the Hot Rod Deluxe.

The reverb schematic is available here (scroll down a little bit) https://robrobinette.com/Compact_Reverb ... ing_Reverb
(I am confused by R40, C28 and the intersected point.)

Which components would I need to modify to achieve this? Is this even possible?

I would also like to hear any input of what could be modified to make this circuit even better.

Are you looking to experiment with this or build something for regular use? The bare-bones reverb in the HRD would need a lot of help to get to something like a solid-state 6G15. Also, the bipolar power supply in the HRD is the place where many failures have occurred due to the dropping resistors running very hot. There are other SS amps that have more sophisticated reverb circuits so you might do some research. Take a look at this project I completed last year, which was a great success: https://ampgarage.com/forum/viewtopic.php?f=6&t=31568 There is some general discussion around reverb circuits there, and I just added a pic of the finished product.

[frontsideboneless]

I want to adapt the reverb circuit from the Fender Hot Rod Deluxe for use as a standalone effect for use in front of an amplifier (like a pedal).

I wish to have the same controls as the 6G15 Fender Reverb Unit (Dwell, Tone and Mix)

I already have a tank with 600ohm input and 2250ohm output impedance. (I have a 1EB2C1A laying around in a broken amp). This is the same type used in the Hot Rod Deluxe.

The reverb schematic is available here (scroll down a little bit) https://robrobinette.com/Compact_Reverb ... ing_Reverb
(I am confused by R40, C28 and the intersected point.)

Which components would I need to modify to achieve this? Is this even possible?

I would also like to hear any input of what could be modified to make this circuit even better.

Are you looking to experiment with this or build something for regular use? The bare-bones reverb in the HRD would need a lot of help to get to something like a solid-state 6G15. Also the bipolar power supply in the HRD is the place where many failures have occurred due to the dropping resistors running very hot. There are other SS amps that have more sophisticated reverb circuits. Take a look at this project I completed last year, which was a great success: https://ampgarage.com/forum/viewtopic.php?f=6&t=31568 There is some general discussion around reverb circuits there, and I just added a pic of the finished product.

Thanks for your reply. I'd like to build an outboard reverb unit as I don't have reverb on the amp I have.

The HRD circuit has a number of advantages for me,
it already uses the same input and output impedances as the tank I have to use.
it's simple (i'm a beginner at electronics and this would be my first project)
it's cheap to make (i'm on a very tight budget)
it's a tested design
i can power it with the 9V power supply I have with this circuit https://tagboardeffects.blogspot.com/20 ... erter.html

I know the 6G15 is the gold standard when it comes to spring reverbs but I'm not expecting ultra drippiness and any reverb is better than no reverb! I know R34 and R35 control the input and output gain for the tank so I can play around with the values of these if I feel that the reverb isn't "heavy" enough for me.

I think that adding Dwell, Mix and Tone shouldn't be too hard and I'd love to have more control to make this build more versatile.

I understand that I might have to have switches instead of potentiometers to control these parameters, I think R34 as a pot would be a dwell control but <1k potentiometers are hard to find, I don't mind having presets of half (100ohm), stock (47ohm) and double (22ohm).

I think R39, the 25k potentiometer already is the wet level/mix control.

I know there is a treble bypass (C52 and R103) to let more treble through at low mix settings, I plan to put this on a switch as I know this had been done as a mod to Hot Rod Deluxes before.

I know the input capacitor C13 controls how much bass is let into the circuit but i'm not sure where a tone control would be in the circuit. I feel like it should be just before the mix control as not to overload the springs or the opamp? As the tone control would be passive, I guess I would need to increase the output gain by increasing R35 to make up for the loss in signal strength?