Thank you for sharing this project. I am planning to make tube amp for myself. I am looking for very low THD and high SNR tube amp schematic that sounds wonderful. Have you done some measurements about THD, SNR, maximum input level, output level etc? What about hum?
What heater voltage was this designed for? I have it put together with 280v b+ and 12.6vdc heater. I'm a bit confused with the heater plus and heater minus. What does the heater minus go to?
From the schematic in post 20 it looks like the board is designed for 12.6VDC for heaters. The heater supply is floating and the two leads connect to H+ and H-. Ground reference is via the voltage divider to H- off the high voltage supply.
I don't have my computer in front if me but iirc the heaters are in series. 2x 6.3v for 12.6v operation.
H- would be the ground rail on a dc heater supply. Irrelevant if using ac heaters.
H- would be the ground rail on a dc heater supply. Irrelevant if using ac heaters.
I think the problem i was running into was I am reusing a mode right PS with only 1 wire for heater. I think the reference or float is made in the ps. My solution is shorting the -heater to gnd. Seems to work. Sounds fine. No smoke
I didn't have enough space or heater power for 8! 6922 triodes. I have 2 triodes per channel cascaded for gain in my preamp.
Nice to have it be extremely compact. Zero audible with little care taken. It's feeding a 10k pot then some set amps.
Thanks to the one who made the Gerber's
Thanks to the one who made the Gerber's
I just used a pair of your boards to build a 6SN7 Aikido for a pal. Worked out very well. I stuck the caps on the underside and mounted the socket side flush with the top plate. 5Y3 rectifier, one film cap, Neurochrome 20th Century Maida board for the B+, and one of v4lve lover's 6V in > 6V out boards for the filaments (with a bit of creative wiring). Khozmo attenuators. Glassware selector switch. VERY quiet. ;-)
One thing I did was to drill a very small guide hole in the center of the each octal space on the board, in order to create an easy template for drilling the socket holes in the top plate.
One thing I did was to drill a very small guide hole in the center of the each octal space on the board, in order to create an easy template for drilling the socket holes in the top plate.