how to filter supply in a EH tube box???

[electrictabs]

since i'm gonna use a toroidal transformer that produces less noise and i won't have space for too many large filter caps how can i successfully filter the power supply?puretube or aron any tips?

[toneman]

Torriods, because of the wound nature of the metal strips comprising the inductor,  reduce magnetic radiation which can couple into adjacent circuits.
A torroid is *still* just a transformer.
U rectify & filter in the same way.   No magic bullet here.
The main *advantage* with torriods, is , where U would normally have to
mount the "EI" pwr xfmr external, for a clean/higain preamp, to reduce
magnetic field humm, U concevablly could mount the torriod in the same
enclosure.   I say "could".  It "could" humm just as bad with poor wiring,
gnding, filtering,  etc etc.
I'd say, if its low voltage out, *use* regulators.
If it's HiV, Use good caps and mayB an inductor 2 make a PI filter.
Don't know what a PI filter is???   Try googling....
Power101--off

[Peter Snowberg]

Torroids radiate about 1/8th the flux that E-I design transformers do, but toneman is dead on with the filtering.

Download this: http://www.duncanamps.com/psud2/index.html  :wink:



The next question is.... can you build one of these in the space you have? ...or at least a smaller version for the lower current? http://www.duncanamps.com/technical/mosfet.html

[puretube]

Filtering should be part of the respective schematic;
(like a big cap across the rails in 9V projects!)
depends on topology, and current draw;

very good reads here, too:

http://www.tubecad.com/

(where you btw. can find out who really invented the SRPP...)

[niftydog]

i won't have space for too many large filter caps

use multiple smaller caps.