> On Aug 28, 2017, at 12:52 PM, Rob Jarratt via cctalk <cctalk@classiccmp.org>
> wrote:
>
> ...
> Interesting that Tony mentions a Triac. There is indeed a triac. I am using
> 220/240V input (being in the UK), would it be expected to double the voltage
> in this case to 325V?
No, 325V DC is what you'd get out of a full wave rectifier (not doubler)
rectifying the 240V UK mains. That's because capacitor input filters -- what
most supplies in the past 60 or so years used -- produce a DC output that
matches the mains input peak voltage, at least under low load. (Inductor input
filters are different, they produce roughly the RMS voltage, but inductur input
filters stopped being common around the time that solid state rectifiers
appeared in regular use. They are a good choice if you use 866 tubes for
rectification...)
A voltage doubler used in the UK would give you over 600 volts, which you're
not likely to see outside of a high power radio transmitter or similar device
using large vacuum tubes.
paul
