In part 1 about the low cost 6CB5A mono blocks I already showed the schematic and explained it in detail. In this part I will show the different components and materials which have been chosen for this project.
The photo above shows all the material necessary for one mono block. It contains all the needed parts, including chassis material, connectors, switches, sockets screws and wire.
Let's have a closer look at the various parts. As explained in the previous part, I already had some unused wooden frames which would fit a mono block. These are 30 cm wide, 20.5 cm deep and just 9 cm high. This leaves just 25.5 by 15.5 cm, 8 cm high in the inside. This restricted space led to certain circuit and parts choices since everything had to fit in. Every amp project needs to start with some decisions and the rest has to be adapted to that. In this case it was the available chassis.
A suitable metal plate was designed which can hold all parts. The power transformer is meant to be mounted on top and hidden under a cover. The next photo shows the chassis parts, frame, transformer cover, top and bottom plate:
RCA for the input and banana jacks for the speaker connectors for chassis mounting:
Tubes, plate cap for the 6CB5A and tube sockets, including rubber washers to protect the ceramic from direct metal contact:
The power supply parts: Power transformer including rubber damping elements for mounting, fuse holder and fuse, mains connector with integrated filter, switches for on/off and ground lift:
Material for internal mounting: aluminium profiles, terminal strips, screws, washers, nuts and bolts and the rubber feet for the bottom plate:
The electronic parts: resistors, diodes, capacitors:
The remaining iron: output transformer and B+ choke:
And lastly wire and insulation sleeve, litz wire for mains, heater and B+ wiring, solid core for signals and thicker solid core for speaker out and ground buss:
In part 3 I will show how all this gets assembled.