Guitar amplifier with tremolo using ECC81 (12AT7), ECL86 (or PCL86), and EZ81.
EF184
This small amplifier project began thanks to a blog reader, Sergio, who contacted me via email to see if I could help him design a small guitar practice amp using…
Restoration of the Iberia T-2161 TV, Part 1
Continuing with the restoration of the television, the first step I take is to check some of its valves using the μTracer3+: EF183 valve: As can be seen in the…
Iberia T-2161 tube TV
This TV came into my hands through a local online ad — I saw it at a good price and immediately thought it had to be mine. A valve (tube)…
μTracer3+ tube tester/curve tracer
For a long time now, I’ve been wanting to have a tube tester—something I’ve never owned—and also a vacuum tube curve tracer, since both would be incredibly useful for me.…
Second Pulse Counting FM Receiver
After building the previous FM valve receiver, I recently constructed another one based on it—this time deviating a bit from the original design… using P-series television tubes, the kind that…
Pulse Counting FM receiver
Here is my latest build: a vacuum tube FM superheterodyne receiver.This project was born out of frustration with medium wave (AM) broadcasting: the constant parasitic noise, the lack of stations,…
Building a Mullard 5-10 amplifier
As a summer project, I set out to build a Mullard 5-10 type amplifier using recycled materials I had in my workshop, and thus this amplifier was born. The chassis…
Optimus Alabama 100W Amplifier
This interesting amplifier was brought to me for general maintenance and a few modifications. Its owner wanted to convert the amplifier for use with guitar and bass, aiming to modify…
Low power AM transmitter
This small single-tube transmitter is designed to broadcast any audio source on the AM band, so that various programs can be heard on all old radios that only have the…
ECL80 Pushpull amplifier
Here I present a push-pull amplifier circuit that uses two ECL80 tubes and is quite simple to build. It’s an interesting amplifier because it uses ECL80 tubes, which are inexpensive…