Most transparent power amp

Kosst, not to belabor a minor point, but a "passive" electronic device would usually be considered to be one having no "active" components (e.g., transistors or tubes), at least in its signal path. A device which provides zero voltage gain but amplifies current and power is not a passive amplifier, in the sense that George was using the term and per what seems to be generally accepted terminology.

Regards,
-- Al
   

kosst

Al's right, the F7 is far from being passive "no active components that the signal passes through"

Cheers George 

Sorry I meant F4, the signal still still passes through active IRFP240-9240 Mosfets, so it's not passive, even if it has no gain, it's still active

Cheers George