"Nutcase Kook "

Hypothetical as enough space for a second Tx this time. Open construction
toroid Tx mainly 45-0-45V 400 watt and 10 turns of fine wire to give an IC
supply of 35V,0.1 amp ac, over the thick windings and under the outer
taping.

** Need way more than 10 turns.

No exact replacement Tx available. If you used a bulk standard 45-0-45
400VA
Tx and then over the outer taping you wound some turns , would you need
more
turns ?

** No.

You get a fixed voltage per turn - depending on the core size.

A 1 square inch core gives about 0.2 to 0.25 volts per turn - the bigger
the core, the more the volts.

Simple trick is to loosely wind about 10 turns on the tranny and check the
resulting voltage with a DMM.

Then you know the turns per volt.


.... Phil