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Category: Circuit

Valve Caster tube effect

Published 29/09/2015 by H&G Amplifiers

Matsumin wrote in his drawings Valve Caster 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 12AU7 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 12AU7s 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
Matsumin Valvecaster circuit
Matsumin Valve Caster

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.

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Shaka HV Guitar Overdrive effect

Published 09/09/2015 by H&G Amplifiers

 

We have built and tested in this great sounding guitar overdrive circuit.

 

shaka hv overdrive schematic
Shaka HV overdrive schematic

 

Original author’s comments:

 

“The shaka hv (higher voltage) is a very low to medium overdrive pedal. This pedal can give you very good clean
boost as well as very low to medium overdrive. To get 18 volts from two batteries, connect the negative of a battery
clip to the positive of the other battery clip. Now use the two remaining leads as usual wich will give you 18 volts.
All caps are film type except the electrolytics. Be sure to use at capacitors that can handle at least 18 volts rating.
The FET is a J201 and the op amp is a TI RC4558 dual op amp. You can use a TL071 single op amp as well. This circuit
uses various snippets from Jack Orman who has don great work with Fets in distortion circuits.
Note: You can also put a capacitor 10uF to 47uF in value from 18V to ground.”

 

Review the overdrive effect

We test op amp and dual use JRC4558 and Fairchild FET J201. The circuit is the same as Klon Centaur, it also uses a high voltage (18V) sound production.

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Klon Centaur analysis

Published 07/09/2015 by H&G Amplifiers

Given a legendary and unmatched sounding overdrive pedal, the Clon Kentaur. Unfortunately the price is quite high, but the magic is never cheap. There are of course aftermarket pedals and copied, even among reputable manufacturers. Not to speak about what inspired this pedal. But let’s face it, it’s not the same. It is the “magic”.

Klon
Klon Centaur – reproduction

Body and Soul

Well, maybe you cut into it. Let’s start with the most basic buffer area. Not too complicated circuitry built around the TL072 opamp chip.
We experimented with the quality of the components and values. Audibly interesting results.

The buffer circuit

klon buffer

The circuit is not complicated, the preamplifier is used in many places. Test circuit made that we can compare what they are doing in different parts of the sound quality. The selection of high-precision components.

preamp
Buffer test circuit

There also has to be said that Gold version used TL072, Silver version uses JRC4558 chip.

Klon Centaur  the soul

We come to the most important part, it gives the familiar sound that occurs in the “magic”. This part is very interesting. Two in the loop to a double potentiometer Gain control what he does. Loop gain, low gain (P1 circle) and the larger (P2 circle) which has been cut in the resulting sound from the D1, D2 diodes, and this signal is fed back to the beginning of the loop. D1, D2 type for 1N34 germanium diodes, curiosity replacing silicon diodes 1n914.

klon soul
Klon Centaur the Soul

Tone circuit

Here’s the tone controls, Treble enhancer circuitry and power amplifier. Use TL072 circuit.




klon tonus
Klon Centaur Tone

Power supply

For experiments simple solution:

power
Battery pwer supply

This is once again an important part of the circuit is interesting that the pre-amp and distortion 9v work. The 18V turn tone circuit works. two 9V battery can be produced, or a special chip circuit ICL7660 or MC34063.

/ Writing is expanding, check back later! /

Until then:

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12AU7 Tube tremolo

Published 19/06/2015 by H&G Amplifiers

This is a Hybrid tube tremolo circuit. It is interesting that a low frequency oscillator (LFO) in electron tube is not resolved, we do circuit transistor for low frequency.

Tube tremolo circuit
Tremolo schematic

BC547 transistors and used ECC82 or 12AU7, so the circuit operates at low voltage. Tube circuit provides classic, warm sine wave tremolo tones.

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Tube distrotion effect

Published 10/06/2015 by H&G Amplifiers

 

Real tube guitar distortion effects. unusual solution works of 2n7000 mosfet transistor. After the transistor is like the valve amplifier, it is very nice and pleasant natural sound of this effect provides a true analog distortion, no digital, no modeling!

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Tube overdrive effect

Published 09/06/2015 by H&G Amplifiers

A lot of effects pedals has been prepared, including the famous Tube Screamer to mimic the old natural distortion of a tube amplifier. These pedals operate a semiconductor basis, more – less successfully mimic this sound. I did this and I use it with great joy:

real tube overdrive
Test version

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Distortion pedal makeover

Published 10/07/2014 by H&G Amplifiers

We built according to the MXR Distortion Plus in the original circuit diagrams; small changes done on it: it is now silicon germanium diode to the original position. This is how such a voice:

Very harsh metallic sound, who really loves to rock and brutal sound you’re after then this is the right solution.Here is the original MXR Distortion Plus is heard in the germanium diode:

The recordings quickly assemble a circuit made of non-studio quality, we wanted to show difference.

The original wiring diagram:

This is the famous MXR distortion pedal transformation, we replaced the original diodes. Sound test!
Distortion pedal circuit
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