said:

I plan to but 50w 200 ohm reostat to reduce the HT (as i have too much
HT out of my main tranformer).
200ma*200 = 100V

0.2 A X200V = 40 watts. A lot of heat to dissipate in a
resistor/rheostat.

You can use an additional transformer to reduce the AC HT voltage, per

http://www.ibiblio.org/kuphaldt/elec...s/AC/AC_9.html

Scroll down about halfway, look for the "bucking" config.

--
Sander de Waal
" SOA of a KT88? Sufficient. "