He worked for Fryette/VHT before Bogner. On the old Fryette forum Steve accused Mark of trying to buy Pittbull transformers from the manufacturer behind his back.
Eddie Kramer
Selected engineering credits:
1967: Jimi Hendrix – Are You Experienced
1967: Jimi Hendrix – Axis: Bold as Love
1967: Traffic – Mr. Fantasy
1968: Jimi Hendrix – Electric Ladyland
1968: Family – Music in a Doll's House
1968: Blue Cheer – Outsideinside
1968: Traffic – Traffic
1969...
Take it to a tech before you electrocute yourself. You don't have to calculate anything, just know how to use a multimeter. If you don't have that skill yet it's best not to be poking around in a tube amp.
Still a thing as in still being produced? No, not for quite a few years now. Your best bet at getting Fryette tones these days is with Synergy modules.