Machine Gun Amps
Fender Reverb Unit Mod

This mod is outlined in the issue of Guitar Player a few years back that reviewed the tube reverb units. I have a slight change to that mod that they suggested that I learned from another guy who liked it better this way. I like it better this way too.

Once again, don't open this thing up unless you know how to discharge the filter caps. Don't shock the crap out of yourself please!


1. Get NOS tubes

Get an NOS 6K6 for the reverb driver, and a NOS 12AT7 and 12AX7 as well. This change will make a big difference right away.

2. Change capacitor C10 to a 500pf

This will let more low end through the amp. Capacitor C10 is underneath one of the pots on the circuit board, I think it's the mix pot. It's obvious when you open it up, it's right in front of you. Changing this cap requires taking the circuit board out, which is a slight pain. Alternatively, you might want to try the 390pf like GP suggests. I like the 500pf better myself. When you get the cap, get it rated for about 200 volts or higher just in case... I find that usually places carry 1kv ceramic discs in this value which is fine to use.


That's it! You will find that the unit will give smoother tone and just plain sound better this way. If you are not comfortable with taking out the circuit board, just installing the NOS tubes will still go a long way to making it sound better.

These reverb units are cool. If you have an amp without reverb, you should try one before you try any digital unit. I use mine in the effects loop of my Marshall and it still sounds good in this unlikely combo!


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Last updated 4/29/2001