"Will Reeve" wrote
Guys, here's a stupid idea! I've got most of the bits to make a Morgan Jones headphone valve amp apart from the mains
transformer and choke...so after a couple of glasses of wine I got thinking. The current consumption isn't going to be too great
(how do you work out the current consumption of a valve?)...what about 24 PP3 9v batteries in series to give me a clean 216V DC
HT. And a wall wart to run the heaters?

Will

Well back in the olden days, portable valve radio sets used HT batteries
like modern ones use low-voltage batteries.

I see no reason not to. Better yet, about about a bank of NiCads or equivalent,
because then you don't have to worry about re-buying when they run out.

It might take some ingenuity to add circuitry to charge them _in_situ_
while the amp is not being used for audio.

Otherwise just taken them out a few at a time and charge them in a normal
charger.


Martin
--
M.A.Poyser Tel.: 07967 110890
Manchester, U.K. http://www.fleetie.demon.co.uk