Discuss the stuff that makes your ears bleed.

Moderators: Slowy, Capt. Black

User avatar
BY bender
#804876
I've been looking for a way to enhance the drip on my Fender 63 Reverb Reissue for a while now and stumbled across a really cool mod on the Surf Guitar 101 forum. The cool thing about this is that it's completely external and will work on any amp that bypasses the reverb by sending it to ground (I believe this is how all the Fender Blackface amps work at least).

There are two parts to this- a resonant bump in the upper midrange to enhance the drip of the reverb (the initial attack, which has a kind of slap-echo vibe to it), and a pot that trims the level of the resonant peak.

The extra cool thing is that it's a completely passive circuit that simply plugs into the footswitch jack!

Image
Image

As you can see, there's sweet fanny adams to it. It's a rotary switch and a pot wired in series from the output of the reverb pan itself (before it hits the recovery circuit) to ground. I've included a foot switch so I can switch between two different reverb sounds.
Image

The practical use of this is that I can now switch between 6 different reverb voicings, from the stock setting to bright and splashy and tame the effect a bit if it's too harsh sounding. The bonus is that, in the stock position (no capacitor), the pot acts as a reverb level trim, meaning I can set two different levels of reverb and switch between them.

My plan is to live with it like this for a while, and eventually pick my favourite capacitors and then build a smaller, tidier version.
User avatar
BY rickenbackerkid
#804912
fascinating mod! I'm surprised that the reverb tank output travels all the way to the foot switch to be bypassed, I would think that would be noisy and unreliable and there would be a transistor that pull the reverb to ground, and that would be what the foot switch switches. the concept makes total sense though, it's just a basic EQ over the reverb tail. I do the digital equivalent on sound desks all the time, EQ'ing the reverb to get the tonality I want
User avatar
BY bender
#804917
bbrunskill wrote:fascinating mod! I'm surprised that the reverb tank output travels all the way to the foot switch to be bypassed, I would think that would be noisy and unreliable and there would be a transistor that pull the reverb to ground, and that would be what the foot switch switches. the concept makes total sense though, it's just a basic EQ over the reverb tail. I do the digital equivalent on sound desks all the time, EQ'ing the reverb to get the tonality I want


Yeah, that weirded me out at first too. Shielded cable is essential!
#804929
bender wrote:
jvpp wrote:
GrantB wrote:Awesome Ben.

Poor Fanny Adams though...I never knew.
https://en.m.wikipedia.org/wiki/Fanny_Adams


Blimey, that's so gruesome :sick:

Bender, would this circuit improve the VOX C15 pathetic (according to strummers) reverb?


Depends on how the reverb is bypassed, but possibly. I’ll post cap values and some sound clips when i get a chance.


bloody solicitors (literally).

Yeh the onboard vox ac15 reverb is not great. Sounds more like playing in a jail cell rather than spring reverb. Big droany steel drum tail and no boing. NO BOING!