EL84 bias issue on Mullard 3-3 tube amplifier
In the original Mullard 3-3 design the operating point of the EL84 tube is highly dependent of the amplification factor of the EF86 valve.
HEATED CATHODE
The electron tube is a marvellous device
1955 Tube Amp
One year of operation of the 1955 Tube Amp with no breakdowns.
It has been a year of using the first model 1955 tube audio amplifier built in May 2019 that I have in my living room. The tube amp has been running two to three hours a day to listen to jazz or classical music, often connected to a raspberry computer-based Internet radio receiver with Kodi software.
Performance measurements on the Model 1955 (Mullard 3-3) tube amp
New performance measurements have been made over the 1955 (Mullard 3-3) tube amplifier. You can see it on the 1955 tube amp measurements page.