Vacuum-Tube Valves Circuits
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Hi, I`ve been looking to add a simple 3 band parametric EQ to a tube bass preamp. My initial idea of making a simple OpAmp based EQ isn`t going to fly .... -
i have a tandberg 74b that i just received second hand - everything on the inside is original, excluding previously replaced tubes. when it first.... -
Experimenting with a vacuum tube VCO similar to the one in the link below, but with a few modifications to accommodate the parts I had on hand; I`m using a cascode arrangement instead of the 6AU6 and a 2D21 thyratron in lieu of the 5696. The circuit really.... -
A fully parametric tube EQ and my best bet seems to be `merging` these two schematics into one so that i can get a tube-based gyrator section (with adjustable Q, Freq and Gain) and use ICs for the input and follower stages (going to use this on a home-built.... -
There is a mod to the RC delay circuits some of you may want to consider. If you wish to have a shorter discharge time so that the circuit restarts.... -
The comment on using the existing phono connector was to not really change anything at all. Just replace the electrolytic and paper caps, add the 3-wire line cord and use the radio as-is. The selector switch on the radio probably has an "Aux" or "Phono".... -
The +/- 3 dB point for the treble is about 2, 5 KHz, with about 12 dB boost/cut at 10 KHz. Perhaps you should check the wiring (again ) or perhaps componentvalues Do you have access to a signal generator yeah i checked wiring and components again and again,.... -
hi i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and.... -
or take one FET, one Zener, and one resistor. No FET and resistor needed if the current is in the range of specs for a zener. Or take a P-channel.... -
Is a capable tube tester, yet its use scenarios can be multiplied with only modest efforts invested in understanding its schematic, regimes, and ways to add new regimes. Eico 666 is capable tester, known to be able to supply voltages and currents adequate.... -
The diagram below shows that power supplies don`t have to be complicated, especially in low-power designs. The filaments are powered directly from the 120 volt AC line, minimising the size of the transformer(s) required to drive the amplifier. Note the.... -
The history of a pioneering tube that was developed by Philips Research and that was, next to the magnetron, The most important tube from World War II The radio valve factory of Philips in Eindhoven was the scene of unusual tension and activity in the.... -
The clock described on this page is the result of both events, a simple single digit nixie clock with some interesting features, but without any difficult components. This clock first of all demonstrates that it is possible to use standard, low-voltage,.... -
The E1T tube you see on the left has been "in the family" for as long as I can remember. Probably my father took it home from work (he worked at the Shell laboratory in Rotterdam) or he bought it in one of the surplus shops in Rotterdam my father and I used....
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In an instrument like the uTracer, which handles voltages of several hundreds of Volts at currents of several hundreds of mA, it is obvious that an error or malfunction can easily result in the destruction of (a part of) the circuit, especially so since the.... -
The circuit was designed to create a power amplifier circuit that will utilize E80CC and EL34 vacuum tubes for better results while providing 35 Watts of.... -
The circuit was designed to create a line preamplifier by acquiring the use of double triode tubes. The circuit comprises of three parts, the main preampl.... -
The three circuits were based on the vacuum tube ECC83 designed to produce phono preamplifiers in compliance with the RIAA standards. Recording Industry A.... -
This tour, available in Stainless DIL 8 legs, can measure 4 analog voltage independent between 0 and 5 volts, and send the result of this measure in the form of four characters on a standard asynchronous serial link. Its serial output is di.... -
MOC3020M Integrated Circuit. I would love a LED to tell me when each cap is charged but I have no idea how to do that or where to put in the circuit, I have a bucket load of 5v LEDs so making use of some would be great. I have Circuit maker but dont have a.... -
This is my first successful vacuum tube project. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 5 watts. This project involves a single ended audio amplifier, which consists of a resistive input network,.... -
Fluorescent Tube Light Circuit of an inverter that uses a single transistor and a single transformer. This type inverter can be made in various.... -
Lately The Peasant has been building a music synthesizer using vacuum tubes. Although this will be used as a percussion synthesizer, it could just as easily be controlled by a keyboard or a MIDI to CV convertor. The first module built is a dual VCO. It is.... -
I don`t believe it was ever intended to be powered off a 9V battery. They`re feeble! Under 2 hours with an Alkaline, or.... -
The voltage requirement the Solidus is desirous of is quite a bit higher than your circuit provides I know Chris. It was.... -
I finally completed a working AM transmitter. The transmitter`s design is based on several ideas, but mainly based on Phil`s Li`l 7 Transmitter design. It is not always easy to achieve oscillation in LC-based transmitters without the right combination of.... -
This tube tesla coil was built inside a CPU power supply unit. It was first built on a workbench using components and jumpers for connections. The tube used is a 4X150 transmitting tube that used forced air cooling. An old oscilloscope transformer was used.... -
Originally Posted by Electrotek so is something missing or not? This is what I`m trying to find out. I think you are missing some of the external.... -
Nice work Spokane & Ghst, i will be in the near future joining you in this replication as this thread is quickly becoming a classic. keep up the....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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