Class A

This is a single-ended triode amp that I built using the 813 transmitting pentode, connected as a triode. It's a fairly powerful SE amp that works very well. It uses a single pentode as the driver (a 12HG7 video amp tube), and a solid-state power supply with a microprocessor controller.

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The Neophyte Amplifier - www.r-type.org

Designed for ease of assembly, this amplifier employs a reliable circuit which is simple for the beginner to follow and understand. Treble and bass tone controls are provided, and an unusual feature is the inclusion of a switched negative feedback loop. To assist in construction, the drilling and wiring diagrams are published in the special supplement.

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6EM7 Single-Ended Triode (SET) Vertical Amplifier

What really drove me to build this 6EM7 amp was an idea about amplifier layout. Looking back at most of my tube designs, and most of those on the internet, revealed a very typical pattern. Amplifiers tended to be flat chassis with tubes and transformers above and electronics below.

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Mini Block Ultra-Linear Class-A Push-Pull EL84 (6BQ5) Valve (Tube) Amp - diyaudioprojects.com

It has been a while since I did anything really crazy in DIY and had it work out far above my expectations. Such is the case for the Mini Blocks. I had a lot of extra parts lying around (really a huge amount of them) and tried to figure out what I could build. Two small chassis about 5 inches by 9 inches by 2 inches (12.5 X 22.5 X 5 cm) were just begging for a project. They are just the right size for lots of things. I first thought of a pair of SET amps. But since I didn't have any suitable single ended output transformers I nixed that idea

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Oscilloscope Testing of the Audio Amplifier - www.r-type.org

This article on audio amplifier testing is extracted from the original four part series on Getting The Best From Your Oscilloscope. The effects of harmonics on a sine wave are best understood by performing a short, but extremely profitable, experiment. The only instrument required (apart from an oscilloscope) is an audio sine-wave oscillator with a frequency range of 90 to 410 Hz. Actually, it is not necessary to have a variable frequency oscillator; fixed frequencies of 2 times, 3 times, etc., the mains frequency are all that is required. The type of oscillator used should be of the sine wave variety. Any oscillator described as 'phase shift' or 'Wien bridge' will be suitable - many other types of audio oscillator do not give a pure sine wave and are therefore unsuitable.

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the 6336 set amp is built using only two components

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The 6336 SET Amp - www.cascadetubes.com

So for quite some time, actually since first designing a 300B amplifier back in 2010, I have been playing with the idea of designing a nice intermediate power (5 to 10 watt per channel) SET amplifier. But I didn’t want to revisit the 300B or 2A3 DHT power triodes, I wanted something different and something that didn’t have the obvious drawbacks of the DHT tubes.