Pretty much all my amplifiers are built to order and can be tailored to specific requirements. These latest amps are an example how far customisation can go.
In this case the customer provided the interstage and output transformers and also participated in the chassis layout. The transformers are made by Monolith Magnetics in Belgium. The layout and chassis is based on my portrait style but adapted to fit the different output transformers.
The circuit is based on my earlier 300B/300B amps but with some circuit modifications requested by the customer. Shown above one channel of the amp equipped with EML tubes.
The power supply uses a classic rectifier instead of my favourite full wave bridge with TV damper tubes. Switches are placed on top which allow adaption of the filament voltage to different brands of 300B tubes which draw different filament current. The power transformer was also provided by the customer.
One channel, amplifier and power supply.
The amplifier chassis with Electro Harmonix tubes:
With Elrog ER300B:
The full amplifier set: