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I first posted about this power supply here: https://groupdiy.com/threads/cheap-tube-mic-preamp-power-supply.90042/and mjrippe pointed out the link I shared there says the specs are 5A @ 6.3V and 200mA @ 280V. I just bought it from amazon so I could return it easy if it didn't work. The 12ay7 data sheet says one 12ay7 takes 300mA @ 6.3V and 3mA @300V so it seems to me that this power supply should work for 4 12ay7s.
I first posted about this power supply here: https://groupdiy.com/threads/cheap-tube-mic-preamp-power-supply.90042/
and mjrippe pointed out the link I shared there says the specs are 5A @ 6.3V and 200mA @ 280V. I just bought it from amazon so I could return it easy if it didn't work. The 12ay7 data sheet says one 12ay7 takes 300mA @ 6.3V and 3mA @300V so it seems to me that this power supply should work for 4 12ay7s.
