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H&G Amplifiers Posts

Time to prototype circuit

There are many things I want to try the circuit to experiment with different ideas. Replaced parts values, modify settings, or other circuit. As a result of this circuit. 12AX7 preamp tubes built. Very nice pleasant sounding. It reminds me of amplifiers in the 60s. Good guitar setup, the “bright” metallic voice.

Prototype circuit. ECC83 tube and 2N7000 mosfet. Low voltage power (12V) .
Prototype circuit

The circuit runs on 12V. Since such a low voltage, low gain, it is necessary to supplement MOSFET amplifier circuit. MOSFET similar characteristics as triodes, so his voice is not as annoying as a transistor circuit.

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12AU7 Tube tremolo

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


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

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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ECC83 / 12AX7 tube

In this article we take a closer look at a bit of a tube guitar amp ECC83   topic. Considering dual triode structure, which means that two of the same reinforcing element is a glass envelope closed. As will become apparent in the US or the Russian 12AX7 tube 6N2P (6Н2П) signal, which is not quite the same, but rather similar; here it is already different from the heater connection. Why is it so popular?

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Distortion pedal makeover

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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