IIRC this was $10. I use one after a Sola regulator for fine filament adjustment.
Rheostat 225 Watt 3 Ohms 8.66A. Memcor. Contact is spring loaded for excellent contact. 5 inch diameter. Shaft 3/8 inch 3/4 inch long. Excellent condition removed from equipment. (S6CE7U) $6.25
https://fairradio.com/april-specials/
