Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: separateness on August 03, 2026, 08:36:27 pm
-
Gentlemen,
I have posted before about my oil can unit which I do very much love for some nice groovy slapback. However there are a few things about it which I simply have grown to find intolerable. No, not the incessant noisiness of the thing. Rather I really do not enjoy what it does to my clean signal. You see it routes the clean signal through a 7199 pentode with a huge plate resistor and although it can sound somewhat cool to overdrive the thing a little, I really just prefer the sound of my guitar going into my amp. As such, I have begun the preparations to build a new circuit for it based on a later version of said oil can. I will use the motor assembly from the unit I have of course and rehouse it a new cabinet with a new chassis with new electronics.
The Echo Reverb III (I have the Echo Reverb II) uses two 12ax7's rather than one 7199 and I think it is a superior design. My little innovation here is to take the III's circuit but make the dry path completely parallel to the effect path by using a couple of cathode followers (sort of like how the 6g15 does).
My reason for posting here is to let some wiser men than I glance over what I am thinking and tell me if my idea has some merit or not. I appreciate any and all thoughts. Pictures should be attached. I hope they are legible.