- Volume – Controls the output volume
- Gain – Controls the amount of signal gain
- Filter – Adjusts the midrange emphasis
- Designed for a 125B enclosure with top-mounted jacks
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jon (verified owner) –
CONFIRMED 100% AWESOME!!
OMG, this thing has such inspiring tones! Through a clean Fender DRRI, or a very slightly driven Marshall -> 2×12 cab – this pedal really adds something magic to the tone. The “ka-chunk” sound of strummed muted strings, the snappy fizz added to the middle pickup. Crank up the drive and volume and the neck pickup has that magic glassy tone from Couldn’t Stand The Weather solo.
In fact, it’s all in here: Cold Shot, Couldn’t Stand The Weather, Things That I Used To Do… as the gain goes up, bring the volume down, and vice-versa.
This might be the best new-pedal experience I’ve had in years. It really captures that SRV tone in a way I have never heard before. Even my little kids said “Daddy, that sounds like your CD!” You’ll hear it instantly.
BUILD NOTES: pay attention to the schematic — not all capacitors are polarized electrolytics, so be sure to order the right bits from Digikey/Mouser/wherever.
Transistors: Order J201 JFET transistors from China via eBay — they’re cheap and the right part for the job (about $3 for 10 — go ahead and order 20 or more). Mine took a couple weeks to get here. I tried a couple different substitute JFETS from digikey and they “work” but do not sound very good (fizzy) and have too little gain due to the higher switching gate voltage. Even among the J201 transistors, you’ll want to sort them for amplification values. (get yourself a transistor tester from ebay @ $20) I bought 100 J201s and sorted groups by gain, which was all over the place. Man these things are inconsistent (which is also, incidentally, why some fuzzface pedals sounded amazing but most were forgettable).
For this application, I found “79-80 mA” gain J201 JFETs gave the best performance — parity volume and gain on the controls at noon, and it had the best overall tone. The filter control is subtle but effective with this range.
Trying lower values (60-62 mA), I found much higher volume and the gain and got a little fizzy, plus the filter control wasn’t as effective. High gain JFETS (100-102 mA) gave low output in this circuit, requiring me to crank up the volume+gain all the way just to maintain parity volume.
Assembly difficulty : 4 (below-to-average)
Components cost : $38 in bits from digikey (including cabinet, switches, jacks, LED, etc.) Less than $50 completed.
Sound Quality : 10/10
Summary: Thrilled with this pedal. I couldn’t live without it – would collect cans or sell plasma to raise funds for another).
Frans van Helvoort (verified owner) –
About the PCB: very good quality and very small. The layout is very good en looks great. About the sound: hmm, I do not hear the sound that I hear in the YouTube demo’s. I have this pedal in front of a Fender Princeton tube preamp (DIY after the Fender specs) and I can not discover the great SRV tone! The sound has no low end and and no sparkling high freq anymore. This is the second I build. The first I build on a pcb for the AMZ dual booster (almost the same circuit) and I thought I made a mistake. But I got the same result with this PCB. It is a very nice booster but no SRV/Dumble magic for me. As soon as I get my transistor analyser I gonna measure the J201′ s I’ve got. Maybe the mA reading vary to much.
rob9993 (verified owner) –
Finally got this thing to produce distortion with 10K at R8 and R14. You need to use SMD J201’s! I used PedalPCB SOT23 Adapter’s and soldered on some leads and this now works.
Clayton Higgins (verified owner) –
I’ve had this a while and just brought it back to my pedal board today. I’ve loaned it to some friends that all like it a lot. Once you realize that this is not an “overdrive” but a boost with a little gain it’s operation makes more sense. On my Strat using 59 Overwound pickups from Planet Tone, I crank the gain up full, set the volume at about 3 O’clock, tone at noon and let it rip. There it is… SRV without the talent. This could be a “set and leave it on” pedal for the Blues guys.
EZ Build and Borrowed from AMZ by Vertex.