Power transformer info and order details are attached. If anyone wants to duplicate the order just see below.
I'll upload full circuit and PCB details soon for review. The plan is a separate PS board, two filament boards, and a driver board. They all fit together like a nice puzzle. Designs are 99% complete. I've already posted some drafts and things have changed very little since then.
Power Supply details follow: The input tubes draw 1.8A total so that 6.3VAC circuit is sized to 3.6A. The two filament circuits draw 1.2A each so they are sized at 5VAC and 2.4A each. My low volt circuits use a super low dropout rectifier and schottky diodes. 5VAC ends up at 5VDC and 6.3AC ends up at 6.3VDC. No need to start higher. For the HV I went with 400-0-100-400 @ 250ma. I already designed a doubler for the bias circuit and may or may not keep it. It's easy to wire it up with the doubler disabled. My thought of keeping it are that I'll end up with some extra boards and someone may want the doubler if they're using a stock PS with a 50V tap. Anyway, more on the final circuits in a few days when I post them.
Also, I just received some Audio Note 0.47uF 630Vdc Copper Foil Series Mylar Oil Capacitors. I know everyone has favorite caps, but I'm locked into these at this point.
I'm looking hard at the Khozmo 51k Stepped Attenuator on the input instead of the recommended 40k resistors from the Electra-Print schematic. Room in the chassis could be a consideration. If someone sees logic for a value other than 51k please let me know your thoughts.
I'll upload full circuit and PCB details soon for review. The plan is a separate PS board, two filament boards, and a driver board. They all fit together like a nice puzzle. Designs are 99% complete. I've already posted some drafts and things have changed very little since then.
Power Supply details follow: The input tubes draw 1.8A total so that 6.3VAC circuit is sized to 3.6A. The two filament circuits draw 1.2A each so they are sized at 5VAC and 2.4A each. My low volt circuits use a super low dropout rectifier and schottky diodes. 5VAC ends up at 5VDC and 6.3AC ends up at 6.3VDC. No need to start higher. For the HV I went with 400-0-100-400 @ 250ma. I already designed a doubler for the bias circuit and may or may not keep it. It's easy to wire it up with the doubler disabled. My thought of keeping it are that I'll end up with some extra boards and someone may want the doubler if they're using a stock PS with a 50V tap. Anyway, more on the final circuits in a few days when I post them.
Also, I just received some Audio Note 0.47uF 630Vdc Copper Foil Series Mylar Oil Capacitors. I know everyone has favorite caps, but I'm locked into these at this point.
I'm looking hard at the Khozmo 51k Stepped Attenuator on the input instead of the recommended 40k resistors from the Electra-Print schematic. Room in the chassis could be a consideration. If someone sees logic for a value other than 51k please let me know your thoughts.
