For a friend the 20 year old "Conrad Johnson MV40" beginner project has been redrawn. This amplifier DIY project uses output transformers from a sparepart "The Fisher C500" ,
......the 20 year old project used OP's with "Ultralinear solder tag's", and reached approx. 35W by 440V on the plates of EL34.
The schematic is similar to to the MV75 with some few changes. If anyone has a wish for a simple tubeamp to built, this one is a rather easy start project.
This MV45 amplifier was made with a multimeter only
There might be some small seriel resistor value changes in the PSU to reach the right voltages on the driverboard, and if the amplifier "motorboat's" (use some old speakers for that) just increase the value of the feedback resistor (approx 1,5K) untill it stops...and then increase the potmeter a bit more and you are ready for valve sound
......the 20 year old project used OP's with "Ultralinear solder tag's", and reached approx. 35W by 440V on the plates of EL34.
The schematic is similar to to the MV75 with some few changes. If anyone has a wish for a simple tubeamp to built, this one is a rather easy start project.
This MV45 amplifier was made with a multimeter only
There might be some small seriel resistor value changes in the PSU to reach the right voltages on the driverboard, and if the amplifier "motorboat's" (use some old speakers for that) just increase the value of the feedback resistor (approx 1,5K) untill it stops...and then increase the potmeter a bit more and you are ready for valve sound
Attachments
Last edited: