EL34 Stereo Amplifier
Power Supply. I love off the shelf parts an PC boards when building. The power supply is a Glassware Audio PS-3 board with a few component changes. A Rubli high voltage delay board turns on the HV after the filaments warm up. I wasn't worried about so called cathode stripping as I don't buy into that idea on a amplifier in this wattage range. I have read that it is an issue on high powered transmitters and such. I had got the Rubli board to experiment with to see for myself, so I installed it. This amp can have over 525v available until the tubes start conducting. It just makes sense that it will put less stress on the tubes on warm up. But the choice is yours when building. Someone had asked me since you don't buy into the idea of cathode stripping, why the high voltage delay board? Consider bias voltage. In a fixed bias amplifier with a high voltage delay, you can be sure that proper bias voltage is up before HV is applied to the tubes.
The chassis is a standard Hammond aluminum chassis. After gathering your components you can layout the chassis by leaving the protective peel off plastic on. I use a fine tip permanent marker to layout the holes. You can mark your holes for drilling with a spring loaded center punch. I make the larger holes with a vintage radio punch set which does a nice job on the transformer wiring holes and tube socket holes.
I like using PC boards. But you can use point to point wiring just as easy if you choose, or have a PC board made from your design with ExpressPCB, Robot Room Copper Connection etc. You also can purchase one of the pre-made boards as those such Pete Millett or others.
Top of the chassis before the PC board was installed. You can see the holes for the bias adjustments near each EL34 socket, and the bias test points between the output transformers. Power transformer, power supply choke, and a separate filament transformer for the regulated DC pre-amp filament supply.