Electro Harmonix Small Stone V2
The more common version of the the vintage Small Stone phaser. Modernized for LM13600/LM13700 OTA ICs.
Electro Harmonix
Electro-Harmonix Big Muff Pi Schematic and Component Table
I used Kit Rae schematics, but I did not follow the same component numbering, as I don’t find it all that intuitive. Kit did it that way for a good reason, this way works better for my brain. There’s also this excellent post by Kit Rae on the EHX forum, broadly describing differences between versions. … Read more
Electro Harmonix V1 Triangle Big Muff 66#5 – 1969 perfboard version
Can’t believe I haven’t posted this one yet since it is one of the better vintage big muffs I built and played. In the very early days EH, component values varied quite a lot so this layout is based on Kitraes schematic HERE. There is also some notes and info the component values. Trannsistors is … Read more
Electro Harmonix Small Stone V3
There was a an incorrect value in the factory schematic. It is now corrected and the layout is verified by slammer88.
Electro Harmonix Pulsar
A modified layout for the old EHX Pulsar which is infamous for its LFO ticking bleedtrough. There is two mods that hopefully can solve it. First, an op amp input buffer and second the more common mod; separating the power with a small value resistor between the amplifier and the LFO section. LFO section also … Read more
Electro Harmonix Small Stone V1
Layout for the first version of Small Stone which was produced between 1974(?) and 1978. Layout is based on schematic from Lectric Fx Note that original had long gone obsolete 8 pin OTA chips so this layout is modernized for easy to get LM13700s.
ELECTRO-HARMONIX: Version 2, Ram’s Head Big Muff, 1973 #3, Point to Point Layout
I think this is my favourite Electro-Harmonix Big Muff. I built this using vintage 2N3565 glob top resistors and opted for some large vintage ceramic capacitors where possible (mainly for looks). Sounds great – the lower gain vintage transistors do change the tone and feel to some degree. Of course it still sounds like a Big … Read more
