Fulltone - OCD v2 Overdrive Pedal


Fulltone - OCD v2 Overdrive Pedal



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Fulltone OCD V2

The Fulltone OCD V2 is an extremely open sounding Overdrive and Distortion circuit.

It differs from other overdrives because it has a good bit more Dynamic Range.

Meaning the difference between picking soft or hard will  yield a more natural range of distortion.

For instance,  this has less compression than traditional diode clipped overdrives.

The OCD also creates complex overtones. It does this without changing the inherent tone of whatever amp and guitar you’re playing through.

In the process this lifts off that blanket other drive pedals can put on your signature sound.

The Fulltone OCD V2 overdrives its JFET opamp. This is how it  accomplishes its tube like distortion

Then, the signal is  hard clipping with a pair of MOSFETs later on in the circuit.

This layout did not exist in a pedal prior to the OCD, and the circuit works very well with a vast array of guitars and amps.

Because of its large amount of available output volume, the OCD works great as a booster.

In Use

Put it in front of amps to goose them into submission!. Also, put through Master Volume amps to drive them much harder than most OD‘s.

However, it also excels at creating its own distortion. It has all the chime of a Class A amp and its complex array of overtones.

The OCD sounds like a cranked amp,  even at  living room volume. This means that so clean playing is more dynamic and dirty sounds still have the ringing overtones.

The OCD’s can access a slew of other in between sounds by simply turning up or down your guitar’s volume control.

In fact, no other pedal “cleans up” like the OCD.

Try it at 18VDC and you get another level of dynamic range and clarity.

There are a lot of OD’s comparing themselves to and stealing from the Fulltone OCD, and that’s to be expected when you’re the best selling handmade overdrive of all time.

This final version of the OCD (V2) has some exciting improvements over previous versions

Class-A wired JFET input raising the impedance from all previous OCD version’s 330K to 1 Mega ohm. This means it interfaces better with all types of pickups because it isolates the input from everything coming before the OCD in your signal chain.

Also, it gives the pedal more touch-sensitivity than any other OCD version, or any other pedal for that matter.

A buffered output completely isolates the the pedal from the influence of everything following it in the signal chain.

This allows much more sustain and overtones than previously OCD’s, even at lower distortion settings.

Internally selectable “True-Bypass” (TB) or “Enhanced BypassTM” (EB) switching.

EB, a Fulltone innovation, is a vast improvement over the industry standard, dynamic robbing unity gain JFET or Bi-Polar buffers used by other companies.

Fulltone’s EB doesn’t have the out of phase issue and tone loss inherent with most circuits either.

True-Bypass was great back when we were only using a few pedals.

But things have changed. Simply placing the V2 OCD (bypassed, in EB mode) in your signal path will recoup all of the lost tone and picking dynamics that standard buffered & TB pedals and cables cause.

All About Version 2

The Fulltone OCD V2 has received many slight tweaks since its birth in 2004, often incorrectly identified as “version 2, Version 3, Version 4.”

In reality there has always been only one versioVersion 1, with very slight variations in a couple of values after that making them V1.0 through V1.8. All OCDs serial 205811 and higher are the new, less compressed versions some refer to as “v2.01”

What’s stayed the same

The Fulltone OCD V2 was the first pedal to use Mosfets as clipping devices.

Another first was their configuration as “hard clippers connected to v-ref” instead of to ground, as was the norm.

These things contribute greatly as to why the OCD has such touch sensitivity. Why they react so well when the strings are hit hard or soft, and why they sound & feel different than all other pedals out there.

90% of these are just slight tweaks of the Tube Screamer.

New Features

Output buffer (when pedal is turned on in True-Bypass mode, or always when in Enhanced Bypass mode) which eliminates it from being influenced by effects that came after it. Translation, your sound remains consistent regardless of placement in today’s more complex signal-chains, loopers, and pedalboards.

This buffer also had a positive effect on the sound, it reduced loading on the pedal’s hard-clipping stage, allowing more sustain of both the sound and the overtones.

Class A configured discrete 2N5457 JFET input section, raising the input impedance to 1 mega ohms (previously 330K) and increasing the dynamics…resulting in significantly better interaction with both single coil and humbuckers.

Internal switch to choose between ”Enhanced Bypass TM” & True-Bypass, and with no popping sound in either mode. No other company offers EB…I invented it.

Downside to True-Bypass:

True-Bypass (TB) switching was the ultimate way to achieve a clean signal path for many years.

Everything’s different now, most guitarists have elaborate pedalboards with 10 or more pedals being the norm.

These have a tremendous potential for signal and tone loss with the many cables, connectors, and other pedals involved in the chain.

There can be so much signal loss that it sounds nothing like the sound of a guitar with a cable straight into the front of a great tube amp. Uninspiring.

What’s the pedal industries’ solution to this problem for the last 40 years?

Unity-gain buffered bypass i.e. a couple of Field effect Transistors configured as unity-gain buffers ala Boss, Ibanez, etc, etc.

What’s the benefit and issues with unity-gain FET buffered bypass?

It reduces the loading effect that occurs using long lengths of cable, and you remove the loud “popping” sound when switching the device on and off.

Although my ears always told me that it sounded “tinny” and that there was signal loss, with the help of a my favorite Electronic Engineer (using some very expensive test equipment) we recently documented that each unity-gain FET buffer actually cuts the gain somewhere between 0.3 to 0.6 dB.

This loss of gain is in the low-Mids and Bass frequencies, resulting in that “tinny” sound now that the highs remained and some of the bass and mids are gone.

Now factor in that there are two FETs per pedal required to couple the IN & OUT path, that’s an obvious loss of between 1dB-2dB per pedal.

What’s an even bigger issue with this old style unity-gain FET bypass?

It kills dynamic pick response. It kills the difference between picking soft and picking hard. Yes, when the pedal is in bypass! This to me is a deal-breaker, and while I’ve always felt this to be the case, it’s great to be able to actually see it on the scope.

What are the  solutions?

Enhanced Bypass! Configuring both of the switching FET’s Class-A! By configuring a FET for gain (also referred to as wiring it “Class-A“) all the dynamics return (and then some), even if you only configure it with the slightest amount of gain, in this case: 0.3 to .06 dB.

People rave about old EP-3 Echoplexes and Ep-3 type boosters, and although they know that they love what it does to the guitar’s sound, they can’t explain why.

It’s because of the Class-A FET preamp!

With a Class A FET the dynamics get amplified, allowing an even greater range of expression than if you were playing through a guitar and just one cable straight into your amp.

The downside with EP-3 preamps is that they throw the signal OUT-of-phase, boost treble, and cut bass. Fulltone’s EB the signal exits the pedal IN-phase and doesn’t change the EQ at all.

With OCD V2’s Enhanced Bypass you get this benefit whether the pedal is turned ON or OFF.

This means that just having the OCD turned off in your signal chain makes the whole rig sound alive, fresh, and more powerful again.


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