The Life and Times of the Fulltone OCD

[Don]

I put this together from a few sources I found for the OCD pedal, and thought it would be interesting to share with you guys.
I like the version 1.7 the best, and was lucky to find one locally on CL.


Version 1.1 (s/n 000-4563)  amp like touch sensitivity, neutral midrange, low lows, high highs  

Version 1.2 (s/n 4564-9473)  more midrange, softer highs, little less low end, volume pot changed from 100k to 500k   

Version 1.3 (s/n 9474-16060)  stronger midrange, increased sustain, drive pot changed from 500k to 1meg (this mod was made to s/n 9127 and above), tone capacitor changed from 0.1u to 0.047u, tone pot changed from 25k - 10k), 

Version 1.4 (s/n 16061 - V1.5)  added germanium diode to clipping section, replace volume pot with logarithmic pot,  opamp feedback loop capcitor and tone control capacitor values lowered for decreased bass response, changed LED from red to blue (not all), pulled out even more harmonics, pulled back the low end, and improved volume control.

Version 1.5 built on the 1.4 circuit board

Version 1.6 built on the 1.4 circuit board

Version 1.7 some built on the 1.4 circuit board

Version 2.0 midrange like a 1.2 or 1.3, very aggressive midrange sounding overdrive, internal true bypass and enhanced bypass switch, completely new circuit board design

[purpletele]

That is interesting data.


I did a whole bunch of mods to mine including changing the IC Chip.


I don't like to work on pedals any more, just amps.


I resurrected the pedal last week and it sounds good with my Tumnus behind it.

[mickey]

Thanks for posting this; I've had mine on my board for a few years, v 1.3 going by the s/n above, though I thought it was later. Sounds good with humbuckers, don't use it with my Strats as it doesn't have enough midrange with my Maz. Basically it sounds good in the right circumstances, ie when the amp is cooking a bit, otherwise it can sound a bit thin at lower levels. I also find it has a bit too much bass sometimes which can't be dialed out. All the controls are kept at about 10 o'clock, switch on LP. Works well for me more often than not, so I keep using it. Maybe the new one is better, not had a chance to try it.

[mudman]

I had a 1.2 for years. Collectors prices convinced me to sell it. Great pedal, just into different ones at the moment.

[captainron (Ron)]

Great post Don!