Aronov preamp

Having a hard time getting my Aronov preamplifier repaired. I know someone asked unsuccessfully back in 2015 for a schematic. Thought I would ask again. Thanks. 
An experienced technician can troubleshoot an amp without needing a schematic!
Send it to Audio Classics in Vestal, NY.
This is what he has reported to me. Not sure if the unit was modified before I got it at an Estate sale.  "It allows one of the tubes to operate as ballast or a current source, without adding appropriate resistors to help regulate the voltages". Any opinions? Nice to find someone with hands on experience