[sdiy] Tube question 1: transformers

[Michael Buchstaller]

>Since beauty is no criterion, I could
>perhaps use two of them back to back.
>It would be ideal to have a beefy 230V/6V
>(could deliver filament heating, be it DC or not)
>and then one 4,5,6V/230, lower power to step up
>again. Ugly, but cheaper.

I have used that topology with several transformers
that i got dirt cheap (10 DM for 24 pcs.) 220V/17.2V 1A
transformers. The output voltage here was about 180...190 V,
when two transformers were directly connected.
I also used 2 in parallel, and the other 2 in series to get
approx. 375 V - works fine, but the pad-per-hole board holding
4 transformers was very close to the limits in it´s mechanical
stability.


-Michael Buchstaller