On Jan 16, 12:14*pm, Andy Evans wrote:
I'm appalled by the number of DC power supplies I have to build to
feed the filaments of the DHTs I use (directly heated triodes), which
need one supply per tube ideally. I'm using up loads of voltage regs
in the process, and wondered which ones "members of the panel" favour.
Typical supply is a 60VA 0-12, 0-12 transformer, then on each
secondary Schottky bridge, 15,000uf cap, 12v voltage reg and an
adjustable reg confugured as a current source. Typical requirement is
7.25v at 1.25A (10Y), but there's also 2.5v at 1.75A (46) and 5v at
1.25A (300b).

I'm using LM1084 at present, but sneaking in some 78S12 because
they're cheaper. LM1084s have gone up recently, so also interested in
cheaper suppliers than Farnell.

So - which voltage regs are your fave choices here? Good quality
output important, but cost also a consideration. This looks right up
Jim's street for starters.

LM338K in the steel case will do all the business you require and last
forever. Maybe pricey but worth it for an IC you intend sticking into
the furnace that is a tube amp.

Good luck.

Andre Jute
Visit Jute on Amps at http://members.lycos.co.uk/fiultra/
"wonderfully well written and reasoned information
for the tube audio constructor"
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HTH.

LM338K in the steel case will do all the business you require and
last
forever. Maybe pricey but worth it for an IC you intend sticking into
the furnace that is a tube amp.

It's a nice product, but around �7 a throw - OK for a one off special
but too expensive for continued building. Even the most basic 3 stage
all-DHT SET needs 6 filament supplies!