"Andy Evans" wrote in message
...
if you want really good regulation,
you still can't beat the venerable LM723.

Note that I really need an absolute minimum of 2A current handling, so
LM723 is out and LM317 is too marginal - tubes need between 1.25 and
1.75A.

**It is a trivial exercise to boost the current of any regulator. Just check
out the manufacturer's data sheet.


No virtue in batteries, and a pig to implement. I have tried, but a
good current source sounds just as good as long as you can get the hum
right down.

Keep the suggestions coming!! Andy

**Use a LM317 and a series pass device. You could use a LM338K, but they're
too expensive for a cheapskate like me. For a filament supply, they'll do
fine and they're easy to implement. In truth, I have used them in the past.
I just don't like to shell out the big Bucks for them.

Trevor Wilson