Origins[ edit ] Until the invention of the transistor inmost practical high-frequency electronic amplifiers were made using thermionic valves. The diode conducted electricity in one direction only and was used as a radio detector and a rectifier. In Lee De Forest added a third electrode and invented the first electronic amplifying device, the triodewhich he named the Audion. This additional control grid in other applications:
Please be aware that most of these vacuum tube projects use potentially lethal voltages that can kill you so do not attempt them if you are not familiar with high voltage safety!
Some of the projects use low voltage and if you are new to tubes and high voltage safety you should start with these. Questions and discussion about tubes and hi-fi audio is always welcome in the DIY Vacuum Tubes forum.
At full output the amp produces a clean 1. This amplifier did a little better than this having a -3dB bandwidth from about 46Hz to about 30kHz. The 6CY7 stereo amp uses a 6CA4 tube rectified power supply with excellent channel separation. This is quickly becoming my favorite amp.
I highly recommend that anyone looking for a little iPod or computer amp give this one a try. The single-ended 6EM7 amplifier is housed in a vertical wooden chassis that has been styled after early vacuum tube equipment of the s. Matt reports that The 6EM7 amplifier sounds wonderful!
The bass is well Wide band amplifier design without being boomy, mid-tones are clear and even, and the highs are crystal clear. As a thank you for the B amplifier schematics, Stamou has shared his implementation of the B single-ended tube amplifier schematic by J.
The power supply filtering sections have been duplicated for each channel for this B triode amplifier and premium parts are used throughout. The audio output transformers are Lundahl LL You can change the tube type to vary the sound and gain considerably.
The preamp uses a 6CA4 tube rectified power supply which is very quiet. The Universal preamp is fun as it allows tube rolling to compare various tubes in your stash.
This is a great simple preamplifier unit to bring out the most in your power amps. The amplifier circuit is push-pull and biased into class-A operation with a CCS. Gain is sufficient that no driver stage is required for the tube amp. The 6DJ8 tube headphone amplifier is suitable for use with many Hi-Fi headphones.
Output power is over mW between 32 ohms to ohms. The response is 20 Hz to 28 kHz within 0.
The Mini Block tube amps use a twin triode to drive the EL84 push-pull output stage which is biased into class-A operation, ultra-linear mode. Output power is 5. Bruce reports that the Mini Blocks are more powerful than the Poddwatts and seem to have more detail while retaining all the good characteristics of the Poddwatt amps.
The preamp uses a solid state HT power supply and DC for the heaters. Gain is 45 dB, sufficient for use with a high output MC cartridge. The large 25 kg 55 lbs monoblock amplifiers were built over a period of 14 months and cost about Euro.
The input stage of the amplifiers consist of a preamplifier and cathode phase splitter using a ECC82, a driver stage using a ECC99 and cathode followers using a ECC82 tubes.
The output stage uses four B directly heated power triodes in a parallel push-pull configuration. The output power is about 25W. The preamplifier uses a solid state power supply and DC is used for the heaters.
The gain of the preamp can be set at 7 or The tube preamplifier measures well performance wise and Bruce reports very clean and detailed sound with that typical warm lush tube sound. The new version allows novice builders to experience assembling and listening to their own headamp.
The project includes PCB image files and can also be built on a protoboard. The DIY enclosure is constructed from aluminum sections and the audio output transformer covers are built using copper clad board. The circuit is very simple, a single-ended output stage using 6L6 or tubes, driven by 6SJ7 or 6SD7 cutoff pentodes.
Chey is very pleased with the results and has replaced his solid state amp with this beauty. The monoblock tube amp kit uses an SRPP input stage with driver tubes and a push-pull output stage with KT88 power tubes.A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a leslutinsduphoenix.com to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the s and s.
Valve amplifiers are used for applications such as guitar amplifiers, satellite transponders such as. The ACOM A Automatic HF Linear Amplifier is the world's most advanced HF amplifier designed for amateur use.
The ACOM A is the first amateur HF amplifier to include both fully automatic tuning and sophisticated digital control capabilities. RF resource for purchasing wireless, microwave, and RF books, products, software and more.
Compare suppliers and products, or request a quote or proposal. The magic is in the mathematical relationship between amateur bands.
The charts below speak for themselves! 4-Band OCF Antennas Our 4-Band antennas cover 40, 20, 10, and 6 meters, with no tuner required!12 meters may also work on the 4-Band watt model.
This amplifier is designed around the low cost Russian GS35B triode, and features: KW output using grounded grid circuitry with about Watts drive. The ACOM A Automatic HF Linear Amplifier is the world's most advanced HF amplifier designed for amateur use.
The ACOM A is the first amateur HF amplifier to include both fully automatic tuning and sophisticated digital control capabilities.