Using a doubler off the fil line has been done before.? ?We used a doubler (FWD) and used the 5.0 vac fil on the drake L4B fil xfmr sec winding....to obtain? 12.74 vdc (after V drop from? both diodes).? ?That was used to operate the primary? side of an opto isolator. Sec output side of the same opto was used to key a mess of sped up vac relays. IE: the opto was used for a soft key setup.? That was a cheap and easy way to obtain 12.74 vdc.? The opto required anything from 9-18 vdc ( nominal was 15 vdc).?
On paper, it should work with a 6.3 vac fil......= 16.41vdc (including V drop from both diodes)? and your proposed LM380.? ?( LM380 requires? 10-22 vdc).? Suitable filtering may just require the? 2 x caps in the doubler.? Perhaps bigger value caps.? An extra? filter on the output would also work, like a simple C-R-C? added on....... provided the v drop across the R? was not too great.? ?A? C-L-C? also works good.?
