12v ac to dc --- again

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andrew
Posts: 587
Joined: Wed Jul 05, 2006 9:31 pm
Location: alabama

Re: 12v ac to dc --- again

Post by andrew »

http://www.ax84.com/static/corepoweramp ... ematic.pdf Is that an elevated heater example? Thanks
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Firestorm
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Joined: Fri Jan 25, 2008 7:34 pm
Location: Connecticut

Re: 12v ac to dc --- again

Post by Firestorm »

andrew wrote:http://www.ax84.com/static/corepoweramp ... ematic.pdf Is that an elevated heater example? Thanks
Yep. I think KOC calls it dc stand-off. Does two things: the ac now oscillates around a voltage higher than ground so it's harder for the hum to interact with the cathode; and it shifts the heater to cathode voltage so you can run cathode followers at high cathode voltage w/o risk.
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renshen1957
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Joined: Fri Feb 20, 2009 8:13 am
Location: So-Cal

Re: 12v ac to dc --- again

Post by renshen1957 »

Firestorm wrote:
andrew wrote:http://www.ax84.com/static/corepoweramp ... ematic.pdf Is that an elevated heater example? Thanks
Yep. I think KOC calls it dc stand-off. Does two things: the ac now oscillates around a voltage higher than ground so it's harder for the hum to interact with the cathode; and it shifts the heater to cathode voltage so you can run cathode followers at high cathode voltage w/o risk.
Hi,

Exactly, it's been around for while and is cheaper than DC heaters. I have run DC standoff voltage on DC powered filaments. Overkill?

Best Regards,

Steve
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