saxtim
Well-known member
Zebra50 had mentioned in a previous thread in the old forum (and on his website) that you could use a G7 power supply with the Royer Mod for a regulated heater circuit and a higher B+. I'm planning on build the Royer circuit, but with the added additions described on the same site http://www.omnipressor.com/Other/G7mics/multiMic.html
I understand the need for a regulated heater circuit, to reduice noise, however I'm curious at what sort of supply voltage the Royer circuit is going to work best. A U47 from memory runs of a 105V B+ supply. I think the original Royer designed power supply is in the same ballpark, though I don't have the schematic for it in front of me. The G7 supply pumps out 160V. I think I remember reading something about voltage change and impedance of tubes etc and setting the right voltage was imperative to the design. Do you think there is anything to be gained or lost by running this circuit at 160V instead of 105V?
On another note, did anyone archive the last soundking groupbuy thread? has anyone seen Perki? I'm hoping that it can get off the ground sometime soon as I'm also working on a u87ai style circuit and I need some capsules!
tim
I understand the need for a regulated heater circuit, to reduice noise, however I'm curious at what sort of supply voltage the Royer circuit is going to work best. A U47 from memory runs of a 105V B+ supply. I think the original Royer designed power supply is in the same ballpark, though I don't have the schematic for it in front of me. The G7 supply pumps out 160V. I think I remember reading something about voltage change and impedance of tubes etc and setting the right voltage was imperative to the design. Do you think there is anything to be gained or lost by running this circuit at 160V instead of 105V?
On another note, did anyone archive the last soundking groupbuy thread? has anyone seen Perki? I'm hoping that it can get off the ground sometime soon as I'm also working on a u87ai style circuit and I need some capsules!
tim