SINGLE END STEREO EXPERIMENT PLATFORM

I collect direct heating triodes for fun and later found they
are very good for single end audio power amplifiers.

I'd like to taste different output tubes so I build
a stereo single end experiment platform to facilitate them.

The concept is simple, I use independent power supplies :

    1.  0-1200V 450ma DC variable to fit power tube (high volt dangerous)
    2.  0-450V DC variable to fit voltage amplifier tube
    3.  0-100V DC variable for grid fixed bias.
    4.  0-12V DC 15A x2 filament supply

Power supply tower with millitary grade high voltage filter capacitor bank
see picture

 

Easy change tube socket arrangement fits different input output
tubes and stage block module board covered with studs for point
to point wiring, so that circuit modification or component change
becomes easy.
See picture.

The output tube connection is simple but different tube will
give different sound.
The voltage amplifier arrangement has many choice such as SRPP,
cathode follower direct couple, RC couple or transformer couple.
I will try them one by one to see the results.

Thank you for looking !