The FX Files TG’S clas­sic stomp­box guide

Total Guitar - - HOW TO -

From trans­par­ent tones to amp-like roar, the Full­tone OCD is one of the most en­dur­ingly pop­u­lar mod­ern drive pedals

1 Drive

The clip­ping wave­form dis­tor­tion on the OCD is de­liv­ered by two 2N7000 tran­sis­tors af­ter the first stage, with the Drive con­trol de­ter­min­ing how much the sig­nal is am­pli­fied be­fore it hits this point. Af­ter the first ver­sion, the drive pot had its value bumped for more dra­matic dis­tor­tion, and on later it­er­a­tions of the pedal an asym­met­ric 1N34 ger­ma­nium diode was con­tro­ver­sially added to more dra­mat­i­cally shift the char­ac­ter of the clip­ping. In the DIY com­mu­nity, the pre-ger­ma­nium ver­sion re­mains more pop­u­lar to build.

2 Tone

The tone con­trol is es­sen­tially a tre­ble roll-off. Although a fair bit of tre­ble is fil­tered at the main am­pli­fi­ca­tion stage, the tone con­trol is used to re­move tre­ble above a fixed fre­quency right be­fore the out­put of the pedal.

3 Hp/lp­switch

The HP/LP switch isn’t a high-pass, low-pass se­lec­tor as the ab­bre­vi­a­tions im­ply, but in­stead se­lects be­tween dif­fer­ent fre­quen­cies to use at the shelv­ing fre­quency for the Tone con­trol. For most play­ers, gui­tars and pickup com­bi­na­tions, the HP, or higher, fre­quency should be the bet­ter op­tion, but like most things it’s about per­sonal taste.

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