I have an early 70's model, "new" Electro-Harmonix "MUFF-FUZZ". It is new, never used, in the box (no papers). It is described on the box as "Instrument Plug-in, Fuzz-Sustain".
I don't know what it does, because I bought it new and never used it. I used my old Boss Tone, which I just sold. It is similar in format to the Boss Tone...input plugs directly into the guitar; Amp plugs in the other end. It is 3" long; 1" deep and 2"wide. It has On/Off slide switch and Boost knob. E-H now makes a 'Double M-F' and a 'Big M-F', that are very popular.
$45, plus shipping.
The earliest E-mail OR Forum post gets the unit.
[This message was edited by Bud Harger on 19 March 2005 at 05:12 PM.]