Matsumin wrote in his drawings ValveCaster 2007, the goal was to create a real tube boost / overdrive pedal that can run on a single 9-volt battery. It worked! Unfortunately defecate 9V battery snap. Valvecaster run well in a 9 or 12-volt power supply. 12V will give you more headroom and cleaner sound. It is designed with single coil pickups. A 12AU7 is particularly suited to this, by virtue of being virtually identical to a 12U7 which was designed to be used at low voltages in old car radio circuits. Indeed some sources say that there isn’t really a difference between the two types and that 12U7s are just selected 12AU7s that have tested well at low voltages.
This circuit is a good example of the low voltage art!
Valve Caster tube effect circuit
This one is a pretty popular now overdrive the real tube. Very nice real tube amplifier has a voice, booster little overdrive sound. Many people rely on this effect. The circuit is quite simple, and best of all the ECC82 or 12AU7 tube operating voltage of 9-12. So many people are doing it from the circuit custom guitar pedal. It has a place among boutique guitar pedals. few circuit modifications everyone can find their sound. The design tube made with the point-to-point wiring. TONE potentiometer and capacitor (R6, C4) is a passive filter. The device structure is simple, the ECC82 dual triode circuit of the soul. This tube is designed to drive the tube is thus relatively little strengthening. but larger current running as the rest of the series (ECC83, ECC81, ECC85), and this is associated with low voltage. ECC82 only the electron tube may be, or of the same type, so 12AU7, 5814 etc vacuum tube. Interestingly enough ECC85 tube works well.
The amendment and brings us opportunities that we can do it with extra supplements can boost or tone. the pipe before the extra boost of a single transistor preamp circuit. from the sound of even tougher, metallic develop.
Valve Caster mods
Based on many individual guitar pedals and effects of this circuit like this fuzz effect:
This is another version. In the control potentiometer done between the two triode:
And here is my favorite circuit, the Extra Boost. There are several types of transistors, we tested the following types: 2N2222, 2N5088, BC547, BC108.