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In Reply to: RE: a few more bits of info may help posted by Stevetronics@yahoo.com on December 20, 2009 at 16:08:10:
Dude,
Nobody in their right mind uses anything other than SS diodes in a DC filament supply.
With the possible exception of directly heated triode O/P types, DC heating is reserved for preamp, especially phono section, duty. AC heating is the norm in power amplifiers.
Fact, tubes are high impedance, high voltage, low current devices. While it is possible to build without transformers coupling the O/P tubes to the speakers, it MOST DEFINITELY is not the sort of thing to tackle as a 1st project.
You say you want approx. 10 WPC. An "El Cheapo" built with 1/2 way decent O/P trafos will yield 12 WPC and it works without a preamp, when driven by a CDP.
I've uploaded the "El Cheapo" schematic. A link to the LENGTHY "El Cheapo" saga is provided below.
Finally, start a new thread on the Tube DIY forum about your ambitions. That "board" is where discussions of this sort belong.
Eli D.
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Follow Ups
- RE: a few more bits of info may help - Eli Duttman 12/20/0916:38:17 12/20/09 (0)