OK, thanks for the part numbers. I should have asked, this is for a DC supply to valve filaments, two small Russian valves with the filaments in parallel. There will be some inrush current when they switch on. How do these regulators cope with that? I see a data sheet for the LM317 shows a "slow start" circuit, I think it uses a capacitor / resistor charge time "timer". Would that help? Why do I want DC? The circuit is a driver amp for a big tetrode, designed for very low noise, the designer specs DC to reduce chances of hum etcetera. It also allows good voltage control, of course, for better valve life. Thanks. The valve data sheet says 0.55 Amps each filament, so I am playing a bit safe on speccing 2 Amps. Cheers!