Tube amplifier electronics repair

  Some pictures: electronics repair. The product name: Dynacord Eminent II. This is beginning to be manufactured in the mid sixties. Initially, all tube design, and later the transistor preamp and tone section. Meanwhile, little change in design as well. This four different input and tone control. A small band certainly met at that time.Well, let’s look at what is inside. Let’s look at it:
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Aural Exciter Makes Your Sounding Real

  Aural Exciter since the 70’s. Do you know that feeling when you’re playing on guitar however you’re missing something? You’ve got many effect like distortion, overdrive, delay or something programed effect. You’re sure something is missing from your music and it’s not other than fatty and lively sounding. Fortunately there is a solution for this. It’s a very interesting device. It’s Aural Exciter or “harmonic enrichment”. This circuit adds harmonics sounds for the incoming signal. Aphex Electronics company made the first device in the 70’s. Initially it was made with vacuum tubes later with transistor. Nowadays you can get…
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Simple distortion effect with TL072

You need a new and simple Distortion effect? Really Simple? Look at this circuit: Not too demanding parts. But the voice .. hmm. Indeed, only a few spare parts required. The circuit is the “soul” of the tl072 chip. It is built around the circuit. And, of course, add garnish. Well, actually distort the character of the D1 – D4 diodes is given. In this case, two 1N4148 and two 1n914 diode. cut the signal. This results in a symmetrical but powerful cut. or maybe the solution according to their own ideas, but you can choose a sound character. even the parts is…
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LM386 Overdrive Effect

LM386 overdrive: easy, cheap, and fast to make. This is known and popular audio amplifier circuit with a fairly simple but good sounding overdrive guitar effect. Neither the operation of the complex. BS170 mosfet guitar signal to the already worsened. the R8 potentiometer regulates the amount of signal to the 386. If you have more than that the chip can handle, then the signal will be distorted. That is, the “overdrive“. So it is quite dry and rough sound. And of course it’s good for us. Listen to:
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Guitar Noise Gate

  While playing the guitar many times there is a problem that unwanted noise can appear. Hence the need for a guitar noise gate.  It happened specifically to a high-gain circuit is very sensitive to the surrounding radio signal.  
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PT2399 Basic delay

  The well-known and used PT2399 effect chip. Sometimes it needs a basic echo effect in music. But especially on stage, concert essential supplies an echo pedal.  Here is a simple basic circuit is shown. The circuit at Princeton Technology Corp. manufactures. Inexpensive, it can be used in many places. Datapage
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High voltage DC to DC converter

  This is a simple 555-based high voltage inverter circuit. The high voltage DC to DC converter is suitable for small current (a few mA) but requiring high voltage electronics. For example Nixiu display, VFD, or a other vacuum tube circuit. We will use a tube guitar pre-amplifier.   The C3 capacitor high voltage type! Min 250V.
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Tone stack circuits

  This is a tone collection of circuit, the most popular and most used circuits and offers some less well-known. Simple  circuit, perhaps the most simple  control circuit. Only two members. This uses the Valvecaster effect.  
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DC to DC converter

  This circuit is the old and well-known NE555 integrated circuits based. DC to DC circuit is not complicated, little parts, and doing pretty much stable voltage. It produces with the 12V DC voltage of 30V to voltage. The NE555 constant operating frequency is set. The 3 pin voltage convert of 30V. D1- D4 and C1-C5 voltage tripler circuit.  DC to DC converter is use in similar tube circuit.  
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3 Transistor Fuzz

  Three transistor fuzz effect, strong sounding. Based on the famous Fuzz Face circuit, supplement with a preamplifier. Tried operating circuit! Q1 2N5088 pre-amplifier transistor can be replaced 2N2222, 2N3904, BC547 type. If you need tougher sound, the Germanium Fuzz Face for you.
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