QUATRO NOVERB

Quatro is a clone of the preamp section of the Fender Quad Reverb. 

This amplifier was used on In Utero. It is basically a Twin Reverb and suits many era Nirvana tones.

 Quatro is meant to be used with a tube power amp, or into an fx loop return. You can also use it to record direct or play live direct with a poweramp/cabsim.

The BMT tonestack you're familiar with already. 

With the volume (gain) set to max it has a light crunch/purr. Don't expect much dirt, you'll use a sansamp classic or similar for that. 

Output level is handled by the Master. 

The preamp accepts:
9-12V DC CENTER NEGATIVE

12V is recommended and most like the original. 

You'll need 500ma for this one so make sure you're using proper power before testing. Use ONLY the specified power or risk permanent damage. 

It uses a SMPS to convert to the same 220V the original used, nothing fake or low voltage at all here. There is a JJ 12AX7 mounted internally and you'll feel it's warmth on the enclosure after using for a while. 

Quatro has a 220V source follower output buffer as well, ensuring that ANY power amp/ impedance can be driven to deafening levels. 

Setting both Volume and Treble to maximum is a recipe for extreme hiss. Turn either down to 9 or below.

While Quatro will drain its capacitors before you can get all four screws out it DOES have a 220V circuit when powered and therefore poses a health risk. 

DO NOT, open the pedal when powered on, change the tube when powered on, or plug power in when open. 

When changing the tube (a few years from now) be sure to hold the pcb/mount firmly and wiggle the tube slowly and carefully until out. Don't be rough with it and damage the PCB/pins etc. Use some care and caution to prevent issues. And remember to do it without power for safety. 

*This design success couldn't have been realized without the help of my good friend Nathan Slade at Sushibox FX. I implore you to visit his site and look at his many genius tube creations.