Ross Phaser

Ross Phaser 434ea9db98c8

 Yes, Modulation Monday is back with the Ross Phaser. It’s not for the feint of heart, but doesn’t require any JFETs, matched or otherwise. Instead it uses OTAs with 3, LM13700N (one for the LFO, two for the audio path). Should fit nicely in a 125B with top mounted jacks. Schematic for reference.

Guyatone SD2 Sustainer / HD2 Harmonic Distortion

Guyatone SD2 Sustainer da0bf6db7d1c

 mellasse sent me a schematic for an old Guytatone fuzz, Guyatone DS2 Sustainer. Looking at the schematic I noticed it was really similar to another Guyatone offering, HD Harmonic Distortion. The main difference is the tonestack, HD2 is scooped and SD2 is more mid focused. So this layout have a switch for both SD2 and … Read more