Vacuum-Tube Valves Circuits
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Transmitter FM 45W with valve. TECHNICAL CHARACTERISTICS: Tendency of catering: 220V AC Frequency of emission at FM: 88~108MHz Force of expense: max 45W (without the...
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While they have been with us for many years, fluorescent lamps remain somewhat mysterious to most people. This isn`t really surprising, since their operation isn`t simple. The tube itself contains a mixture of gases, but the active ingredient is mercury.....
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VTTC (Vacuum tube tesla coil) is a Tesla coil with vacuum tubes as a switch. I used self-oscillating circuit with two russian (soviet) tubes GU-81M connected in parallel. The source of high voltage are two MOTs (Microwave oven transformers) connected in....
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This began as a simple project to build a cheap phono stage for a very old turntable with a cheap cartridge out of parts on hand. However, it turned into a pretty good project that definitely outclasses the rest of my analog setup. Oh well, at least it was....
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12AU7 (ECC82) Cathode Follower Tube Preamplifier Schematic. Two stage 12AU7 preamplifier with low impedance output stage. The overall gain is about 8 times..
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6DJ8 Tube RIAA Phono and Line Preamplifier Schematic. The HT power supply uses tube rectification and regulation..
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6DJ8 / ECC88 Symmetrical SRPP Tube Preamplifier Schematic. Gain of the preamp is 27 dB (about 23.5 times)...
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This two-stage audio preamplifier is intended for use with high-fidelity magnetic phonograph pickups. The overall gain of the circuit is about 150. The circuit is from the RCA tube receiving manual and meant for use with the famous RCA 7025 twin triode.....
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Direct-coupled Single-Ended (SE) 6V6 and 6V6GT Tube Amplifier Schematic with ECC83 Driver Stage. From the book Build your own Audio Valve Amplifier by Rainer zur Linde...
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Mullard EL34 push-pull vacuum tube amplifier scheamtic using Dynaco A420 audio output transformers..
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The NP-100v12 is a simple headphone amplifier that allows an entry level builder to experience assembling and listening to their own creation. I use the term builder as electronic experience combined with innovation which allows the creation of a device,....
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One of the advantages of hosting a hobby website is that you meet people through email who have similar interests as you. Ever since we posted Bruce`s first OddWatt project on the site I have communicated with a number of DIY hobbyists who have built the....
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Last year I built and reviewed the low cost Oatley Electronics K272 Tube Stereo Headphone Amplifier Kit. In conversation with Oatley Electronics (located in New South Wales Australia), they told me that the kit became very popular and sold pretty much all....
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Oatley Electronics in New South Wales Australia makes a few kits based around the Raytheon JAN 6418 sub-miniature valve (tube). I decided to try out the $27AU K272A Stereo Tube Preamplifier - Headphone Driver kit. [Note - the K272 has been replaced with the....
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This past summer I saw Transformers: Revenge of the Fallen and I was inspired to build an enclosure for a vacuum tube amplifier that incorporated the Decepticon logo. The tube amplifier replaces a solid-state amplifier which was driven by a tube....
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The PCB for this amplifier can be purchased from Spare Time Gizmos for $16US. In a single afternoon you can have the whole board assembled and dropped into a chassis of your choice. The value and type of component is laid-out in the parts list. But what I....
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that used a SRPP (shunt-regulated PP) driver stage I started to do some research and modeling on a SRPP. The advantages of such a line stage are much the same as those when a SRPP is used as a driver. Good linearity, low distortion, low impedance output,....
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This project is related to the other tube amplifier projects I have posted. It has more than a casual similarity to the first Push-Pull EL84 (6BQ5) Oddwatt project from nearly two years ago. Both tube amplifier projects use EL84 / 6BQ5 tubes and the earlier....
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This is a project that I always wanted to do, but managed to put off for a long time. It has been over a year in the doing. Partly because there are so many good phono preamps in existence and I was slightly concerned that it was beyond my design skills. It....
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The power supply has been simplified. Power transformers and rectifiers have been omitted and some parts have been omitted from the MOSFET voltage regulator circuits: 1N5242 zener diodes between the source and gate and 10k resistors in series with the gate.....
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Electron tubes How Electron tubes work, Early tube history, The triode, The tetrode, Beam power tubes, The pentode, Combination tubes, Tube parameters, Ionization (gas-filled) tubes, Display tubes, Microwave tubes, Tubes versus Semiconductors Electron tubes....
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A8V W8EXI 6CL6 One Tube Transmitter. The operation of the 6CL6 transmitter is actually quite sophisticated....
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This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. Valves (also known as vacuum tubes) are very high input....
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The given circuit of a current controlled LED tube light uses a couple of high voltage transistors which works on a very basic principle for implementing the required current control operation. Resistor R2 is placed forconvertingthe rising current to voltage....
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An amplifier built to drive my Sennheiser HD-600 headphones. Because of the relatively high impedance of these phones, I wanted plenty of voltage available to drive them. Because of the large dynamic range possible with these phones the system had to be very....
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By sufficiently lowering output impedence of a circuit and supplying enough current to drive cables, it does not suffer the same problems as passive designs. As such, it seems to solve the many of the problems inherent in both active and passive preamps....
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The circuit was taken from one of the old elektor electronics magazine and it is indeed a very cute little circuit which may be used for creating high intensity lighting effects during festivals, parties and fun gatherings. Diodes D1 and D2 along with the....
Transmitter FM 45W with valve. TECHNICAL CHARACTERISTICS: Tendency of catering: 220V AC Frequency of emission at FM: 88~108MHz Force of expense: max 45W (without the...
While they have been with us for many years, fluorescent lamps remain somewhat mysterious to most people. This isn`t really surprising, since their operation isn`t simple. The tube itself contains a mixture of gases, but the active ingredient is mercury.....
VTTC (Vacuum tube tesla coil) is a Tesla coil with vacuum tubes as a switch. I used self-oscillating circuit with two russian (soviet) tubes GU-81M connected in parallel. The source of high voltage are two MOTs (Microwave oven transformers) connected in....
This began as a simple project to build a cheap phono stage for a very old turntable with a cheap cartridge out of parts on hand. However, it turned into a pretty good project that definitely outclasses the rest of my analog setup. Oh well, at least it was....
12AU7 (ECC82) Cathode Follower Tube Preamplifier Schematic. Two stage 12AU7 preamplifier with low impedance output stage. The overall gain is about 8 times..
6DJ8 Tube RIAA Phono and Line Preamplifier Schematic. The HT power supply uses tube rectification and regulation..
6DJ8 / ECC88 Symmetrical SRPP Tube Preamplifier Schematic. Gain of the preamp is 27 dB (about 23.5 times)...
This two-stage audio preamplifier is intended for use with high-fidelity magnetic phonograph pickups. The overall gain of the circuit is about 150. The circuit is from the RCA tube receiving manual and meant for use with the famous RCA 7025 twin triode.....
Direct-coupled Single-Ended (SE) 6V6 and 6V6GT Tube Amplifier Schematic with ECC83 Driver Stage. From the book Build your own Audio Valve Amplifier by Rainer zur Linde...
Mullard EL34 push-pull vacuum tube amplifier scheamtic using Dynaco A420 audio output transformers..
The NP-100v12 is a simple headphone amplifier that allows an entry level builder to experience assembling and listening to their own creation. I use the term builder as electronic experience combined with innovation which allows the creation of a device,....
One of the advantages of hosting a hobby website is that you meet people through email who have similar interests as you. Ever since we posted Bruce`s first OddWatt project on the site I have communicated with a number of DIY hobbyists who have built the....
Last year I built and reviewed the low cost Oatley Electronics K272 Tube Stereo Headphone Amplifier Kit. In conversation with Oatley Electronics (located in New South Wales Australia), they told me that the kit became very popular and sold pretty much all....
Oatley Electronics in New South Wales Australia makes a few kits based around the Raytheon JAN 6418 sub-miniature valve (tube). I decided to try out the $27AU K272A Stereo Tube Preamplifier - Headphone Driver kit. [Note - the K272 has been replaced with the....
This past summer I saw Transformers: Revenge of the Fallen and I was inspired to build an enclosure for a vacuum tube amplifier that incorporated the Decepticon logo. The tube amplifier replaces a solid-state amplifier which was driven by a tube....
The PCB for this amplifier can be purchased from Spare Time Gizmos for $16US. In a single afternoon you can have the whole board assembled and dropped into a chassis of your choice. The value and type of component is laid-out in the parts list. But what I....
that used a SRPP (shunt-regulated PP) driver stage I started to do some research and modeling on a SRPP. The advantages of such a line stage are much the same as those when a SRPP is used as a driver. Good linearity, low distortion, low impedance output,....
This project is related to the other tube amplifier projects I have posted. It has more than a casual similarity to the first Push-Pull EL84 (6BQ5) Oddwatt project from nearly two years ago. Both tube amplifier projects use EL84 / 6BQ5 tubes and the earlier....
This is a project that I always wanted to do, but managed to put off for a long time. It has been over a year in the doing. Partly because there are so many good phono preamps in existence and I was slightly concerned that it was beyond my design skills. It....
The power supply has been simplified. Power transformers and rectifiers have been omitted and some parts have been omitted from the MOSFET voltage regulator circuits: 1N5242 zener diodes between the source and gate and 10k resistors in series with the gate.....
Electron tubes How Electron tubes work, Early tube history, The triode, The tetrode, Beam power tubes, The pentode, Combination tubes, Tube parameters, Ionization (gas-filled) tubes, Display tubes, Microwave tubes, Tubes versus Semiconductors Electron tubes....
A8V W8EXI 6CL6 One Tube Transmitter. The operation of the 6CL6 transmitter is actually quite sophisticated.....webp "Click to Zoom Circuit")
This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. Valves (also known as vacuum tubes) are very high input....
The given circuit of a current controlled LED tube light uses a couple of high voltage transistors which works on a very basic principle for implementing the required current control operation. Resistor R2 is placed forconvertingthe rising current to voltage....
An amplifier built to drive my Sennheiser HD-600 headphones. Because of the relatively high impedance of these phones, I wanted plenty of voltage available to drive them. Because of the large dynamic range possible with these phones the system had to be very....
By sufficiently lowering output impedence of a circuit and supplying enough current to drive cables, it does not suffer the same problems as passive designs. As such, it seems to solve the many of the problems inherent in both active and passive preamps....
The circuit was taken from one of the old elektor electronics magazine and it is indeed a very cute little circuit which may be used for creating high intensity lighting effects during festivals, parties and fun gatherings. Diodes D1 and D2 along with the....
.gif "Click to Zoom Circuit")
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.....
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to....
