Hi BBaxley2
The main guy regarding SUMO and other James Bongiorno designs is Mike Bettinger. He restored my Sumo Nine amplifier year ago and did a phenomenal job. At the time Mike had different price points for the fixes he does.
Here is his contact info.
http://www.gasaudio.net/
Phone: (804) 317-9118 (Lynn)
E-mail: Mike@GASaudio.net
Good luck with the repair. What Sumo preamp is giving you problems?
The main guy regarding SUMO and other James Bongiorno designs is Mike Bettinger. He restored my Sumo Nine amplifier year ago and did a phenomenal job. At the time Mike had different price points for the fixes he does.
Here is his contact info.
http://www.gasaudio.net/
Phone: (804) 317-9118 (Lynn)
E-mail: Mike@GASaudio.net
Good luck with the repair. What Sumo preamp is giving you problems?