dberning wrote:
Speaking of cathode bypass caps, has anyone tried polymer types? I just got some for a power supply application. They are rated for 4 volts and 560 uF, in a package 5/16 inch tall and same in diameter. Seems perfect for a 12AX7. The impressive thing, and is why I got them, is the fantastic ripple-current rating of 6 A. I know that you are not putting 6A through a 12AX7, but to have that rating they have extraordinarily low ESR and ESL. Higher-voltage types are available that could be used for the likes of a 6V6.
Like the caps from Japan shown in the attached data sheet?
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TK Poly PPSO Capacitors.pdf [142.29 KiB]
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I've got a fancy Hammond chassis on the way, and a can for the toroid, which I hope will shield it enough to place it on the main chassis. If not, I'll outboard the raw DC supplies. It wasn't a cheap project--someone more skilled at building reg'd supplies etc. could do it much cheaper, but honestly the Neurochrome board is kind of key to the excellence of the sound, IMO, as well as keeping the power supply fast and light-weight. Looking forward to it sounding even better when I get it off the sprawling breadboard.