This is the absolutely awesome, Limited Edition 1981 DRV Mod 1.

In comparison to the standard DRV, the Mod 1 is overall a bit darker, warmer, fatter, the range of the CUT (tone) knob is slightly different. The standard version can be a bit too bright sounding for most peoples set-ups, the Mod 1 addresses that beautifully.

The Mod 1 comes with3 interchangeable Op Amp chips, which are super easy to swap out to find your favourite:

From 1981's Matthew Hoopes -

TL072 - This is the standard, probably my favorite overall. It has a warm and soft low-end character, is very clear, and does the job nicely.

NE5532 - This one is used in one of my all time favorite pedals - the Bondi Effects Sick As. And while it doesn’t necessarily cause DRV to sound more like a Sick As, it adds a different midrange character, and tightens up the low end. Palm mutes become a bit more punchy, with a little more push, and a little less smoosh (to be technical), but it’s also a very good sounding option, clearly!

OPA2134 - I’m also making this one “Hi-Fi”, just for fun! This is a higher fidelity chipset, made by Burr Brown, and has a lower noise floor. I’ve previously only used this chipset in the Nickel-Plated DRV LTD version, as well as the recently released “PROTOTYPE”. This series will also be limited, and even further differentiated sonically. This version gets a little smoother on the midrange, warmer, fatter overall, and reacts noticeably different in zero gain mode, where it is even cleaner.

The mod 1 takes the best of the standard DRV and sends it to stratospheric sonic awesomeness.

Matthew Hoopes writes a great article all about the DRV Mod 1 in his substack, which you can find with a quick google search.

There's also a short video on his twitter showing how to change the Op Amp.

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