Exar MT-1 Metal
Might be something for the HM-2 fans? The gyrator frequiencies and Q’s looks promising… Schematic is avaiable HERE.
HM-2
Rocktek Metal Worker
A “bottom of the well” HM2 variant. Differs enough to warrant its own layout, though…
Guyatone PS-024 Distortion H
Guyatone realeased some very interesting, innovative and good sounding circuits in the 80s. Since they are sadly overlooked and quite rare, Deadend Fx decided to trace and release PCBs for some of these gems. PS024 Distortion H shares some similarities with Boss HM2 but it still differs enough to not qualify as a clone. The … Read more
Dunwich Amplification DIY HM2 “2021 Edition”
Another take by Dunwich Amplification on the mighty HM2 circuit. Just released as a DIY project at OSH Park it has some tweaks all along the circuit compared to the stock Boss schematic. It also has a built in active clean blend circuit and switches for both hard and soft clipping diodes. Schematic and BOM … Read more
Dunwich Amplification Modified HM2 – “Left Hand Path” version
Traced by AlexS and Fuzzhead, this is a quite tweakable and heavily modified HM2 variant with more gain on tap, more volume, two on/off/on diode switches and a very flexible four band eq. It is a quite noisy beast when Gain and all eq controls is maxed out though but a buffer up front helps … Read more
Dunwich Amplification Modified HM2 – DIY version
Dunwich released a small run of DIY PCBs a few years ago of a modified HM2. There is a few changes from a stock HM2 most noticable the on/off switches for both soft clipping and hard clipping diodes. You may want to experiment with the cap values at one of the gyrators for a more … Read more
Arion SMM-1 Metal Master
Some says this is a HM2 killer. I don’t know about that but it differs enough circuit wise to deserve its own layout. Note that “Hard/Soft” switch is omitted as well as “Output 2” op amp circuit. Factory schematic is a mess so I had to draw up a cleaner … Read more
