I started with a Tube Audio Design TAD 150 Signature as a starting point because I love the remote volume control function. I have a second one so I have an absolute perfect comparison. Bob and Gary took my TAD and did their latest rhbackert preamp mods and all I can say is compared to a host of $10K major league preamps i have had through my system I have never heard anything like it.
(And a growing number of guys in the Phila Audio Society have had the same experience.) My amps are a pair of Conrad Johnson Premier 8A monoblocs with NOS GE 6550 tubes. After Bob did his mod upgrades to them including his power supply mods, and his dynamic linearity circuit changes to the main system plus V-Caps and gold/silver wiring changes I have never in my 35 years of Audio heard anything to get even remotely close!! FYI, The rhb preamp and amp are driving Magnepan 20Rs. A final comment, I never knew how magnificant the 20Rs were until I heard them with the rhb moded equip.
(And a growing number of guys in the Phila Audio Society have had the same experience.) My amps are a pair of Conrad Johnson Premier 8A monoblocs with NOS GE 6550 tubes. After Bob did his mod upgrades to them including his power supply mods, and his dynamic linearity circuit changes to the main system plus V-Caps and gold/silver wiring changes I have never in my 35 years of Audio heard anything to get even remotely close!! FYI, The rhb preamp and amp are driving Magnepan 20Rs. A final comment, I never knew how magnificant the 20Rs were until I heard them with the rhb moded equip.