Optimus Siroco Model 160 (Part 1)
EF184
Once again, another Optimus amplifier has fallen into my hands, and this one will be the first I actually own, since unlike other Optimus models, this one was given to…
Amplifier
Design and construction of a high-fidelity stereo amplifier using PCL85 / PCL805 vacuum tubes
As my final degree project, I designed and built a high-fidelity stereo amplifier using common television valves — in this case, the PCL805, although PCL85 tubes or other equivalent versions…
Guitar amplifier with tremolo using ECC81 (12AT7), ECL86 (or PCL86), and EZ81.
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…
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…
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…