tube amplifier

I unexpectedly got my hands on this interesting unit. It's a guitar amplifier, but it has no preamp so it should technically be a simple tube amp. Since it has two channels it can technically be used as a stereo home audio amplifier. If that would make sense and how it compares to actual 'hifi'...

So far, I have been very satisfied with my Destiny eXperience MKII. However, I have now noticed a hum on the left channel. I thought it might be due to bias. While measuring and adjusting, I found that the third KT88 tube has no bias. What could be the reason for this? I have also discovered...

People seemed to enjoy my last tube amplifier measurements post, so I decided to do another. I modded this stereo Magnavox 8605 console amplifier to run 12BH7 dual triodes as output tubes, converting it from a single-ended pentode to a single-ended triode (SET) amplifier. I used a schematic by...

I know, I know, it's heresy, but I find myself thinking it might be fun to put together such a single ended tube amplifier kit that should be able to drive speakers at modest volume. From the little I read, it seems like a reasonably competent electrical design and a well made kit. But I could...

Hello everyone, I am a vintage audio enthusiast who enjoys designing, modifying, and repairing tube amplifiers. I'm also an objectivist and a long-time reader of ASR, but I've always wished there was more tube-related objectivist content on this forum. As we all know, tube amplifiers are far...

Meaning of travesty in English: Something that fails to represent the values and qualities that it is intended to represent, in a way that is shocking or offensive: Photo from Audiophonics, who sells it for 139€

Does anyone here own or have heard the Aiyima T9? The T9 has some very good reviews and some of the sound demos i have heard on Youtube would make you believe it sounds as good as some more expensive amps on the market. Is it really that great, or maybe just overhyped by Youtuber reviewers in...

One of my next projects is a valve amplifier. I built many solid state amplifiers and I'm very happy with these. I always considered valve amplifiers as being vastly inferior to solid state one but nevertheless I would like to build one to measure it and to listen to it. From all the available...

I am new to the world of higher end quality audio equipment. I have a Carver power amp (class A, discrete channels, 100w) and preamp (1985) and they are driving Ohm Walsh Two speakers built in 1985. I now wish to move into the world of tube amplifiers. I have come across many online ads which...

Selling my Bottlehead Crack 1.1 headphone tube amp that I built a couple of years ago. Selling due to not getting much use. I installed the Speedball upgrade when I built the unit. The wood base is stained black, with the corners sanded down so they do not get snagged on clothes, etc. Has the...

Bluetooth Hybrid Stereo Tube Amplifier with Coaxial/Optical/CD/DVD/USB/Bluetooth inputs Specifications: • Power output: 50 WPC RMS @ 4 ohms • THD: 0.5% @ 50 WPC • Minimum speaker impedance: 4 ohms • Channel separation: 50 dB • Frequency response: 20-20,000 Hz • Preamplifier tube: 6U1 x...