EP200 Booster using an ECC82 Tube for Jorn in Norway. Controls are Level and Gain, and the circuit is voiced for Bass Guitar with bigger in/out capacitors than I usually use. The circuit is based loosely on the input section of a Selmer EP200 Echo unit.
Selmer echo boost, blue smooth hammerite finish, handmade turret board, circuit half on board and half on the tube socket, tropical fish input capacitor, 12v dc power only.
Noticed there was a smudge on the lens of the camera after taking the last pics of the Selmer Echo Boost so here are some better shots with a clean lense. Soundclip (level only halfway up on booster) here.
Finished Booster based on a cross between the Valvecaster and the Selmer Echo 200 input section! Soundclip to follow.
I have been toying with the idea of doing a booster based around the input section of an old echo unit for a while, I found a schematic for a Selmer echo 200 where the input section looked very similar to the Valvecaster (apart from it uses an ecc83 valve rather than a 12au7). So I made this schematic that uses elements of both circuits. Have breadboarded it and it sounds good! Nice tone and overdrives in a pleasant way with chords, also reacts well to playing dynamics.
Tube Booster for Brent in the USA. The input and grounding is all on the tagboard, the main circuit itself soldered directly on to the tube socket.
Joe sent me a "c64ised" photo of his Tube Booster in use, here's what he has to say - "My tubebooster has two jobs. The first is in processing my synth drum sounds. I'm layering up lots of component sounds then resampling the result through the tube to give it a bit of unifying crunch. Proper good. The pedal's second job is as a live effect for my Dave Smith Evolver monosynth, which has lovely analogue oscillators and filters but a very digital all-or-nothing distortion. The tubebooster, used in moderation, gives my bass sounds plenty of compression but with warmth, soul and a bit of welcome unpredictably. That's not to say I don't crank it up from time to time too, and it's more than capable of full-on overdrive which sounds great on leads. A quick but important technical note: the tubebooster is designed to accept an instrument signal (like a guitar), not a line signal (like a synth) so I needed to reduce my synth's volume to around 10% of normal (-20dB) before inputing it to the pedal. Also, because the pedal's output is an instrument signal, I'm running it through a DI box before it goes into my sampler. Anyone planning to run it straight into a guitar amp will be fine though; just remember to keep your synth at a low volume (around 10%).
Here is a Tube Booster made for Edgar in London. Have not posted a lot on the blog recently as last weekend my second child was born, a daughter called Alice! ; )
Another Tube Booster, this time in a Hammond style case, sanded then clear coated. This has a Zaerix ECC82 tube, extra large MXR style knobs, Blue l.e.d. and Mullard input capacitor. Listen here.
Another Tube pedal based on the Valvecaster, this time using a Brimar 12au7 Tube. This is just the modded circuit on its own with Volume and Drive controls. Runs at 12v and has a built in voltage regulator so it can be used with any old unregulated 12v power adaptor. Also features a red l.e.d. 'on' indicator, and Mullard tropical fish input capacitor for added mojo ; ) Has a warm sound which can be driven into mild distortion. Listen here.
Tube overdrive based on the Valvecaster circuit, using a Mullard ECC82 Tube. I tweaked the original circuit a bit (slightly different component values, no tone control), and added a silicon booster circuit before the Tube Booster. You have control over the volume of the Si booster, then control over the drive and volume of the Tube booster. Turn the Si booster right up with the Tube booster low and the pedal starts to get very fuzzy indeed! Back off the Si booster and turn up the Tube booster for more of the warm Tube sound and less distortion. Runs off a regulated 9v power supply only. Soundclip soon ; )
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