I have VTL MB100 and I did change the diode rectifiers to IXYS bridges for main and bias supplies;Caddock power-dropping resistors instead of stock ones;Black Gate electro by-pass and Cathode de-couplers; Relcap RTX for coupling capacitors;Large and fast Ulytic film filter caps instead of stock electrolitycs.
Also ceramic sockets;Chasis damping with EAR products(front faceplate, top lid and PC-board)
Implementing a MUTE switch with 10Ohm/50W resistor(my own needs for that)
Re-arranging a circuit for 12BH7A input tube(the same as splitter one) like in bigger VTLs.
Threading through non-detachable VanDenHul Mainstream Hybrid powercord with Marnico locking plugs.
Re-arranging the amps to 220V operation due to already existing dedicated line in my appartment that is certainly had been hooked up with hosp-grade locking receptackles.
Results: expected higher ciruit stability and i expect tubes to last much longer; definitely higher signal to noise ratio is in effect already compared to the previous;SPEED!;Hum dissapeared almost completely and only audiable with maximum preamp volume settings!
Now amps are undergoing different stability tests with signal generator that I usually set up for some low-end extreams in order to be sure that I can play with extreams when I hook up speakers.
Until than I listen to them not at high volume levels in triode mode and they seem to deliver much more detail with much greater clarity than before. Bass a-bit shallow but I believe that after some play time it will go deeper. If I will need deeper bass after all I know I have to increase the feedback a-little which is not a big deal and can be done without dissassembling the amp (except bottom cover certainly)
Overal replaced elements are about 50 for both monos.
Also ceramic sockets;Chasis damping with EAR products(front faceplate, top lid and PC-board)
Implementing a MUTE switch with 10Ohm/50W resistor(my own needs for that)
Re-arranging a circuit for 12BH7A input tube(the same as splitter one) like in bigger VTLs.
Threading through non-detachable VanDenHul Mainstream Hybrid powercord with Marnico locking plugs.
Re-arranging the amps to 220V operation due to already existing dedicated line in my appartment that is certainly had been hooked up with hosp-grade locking receptackles.
Results: expected higher ciruit stability and i expect tubes to last much longer; definitely higher signal to noise ratio is in effect already compared to the previous;SPEED!;Hum dissapeared almost completely and only audiable with maximum preamp volume settings!
Now amps are undergoing different stability tests with signal generator that I usually set up for some low-end extreams in order to be sure that I can play with extreams when I hook up speakers.
Until than I listen to them not at high volume levels in triode mode and they seem to deliver much more detail with much greater clarity than before. Bass a-bit shallow but I believe that after some play time it will go deeper. If I will need deeper bass after all I know I have to increase the feedback a-little which is not a big deal and can be done without dissassembling the amp (except bottom cover certainly)
Overal replaced elements are about 50 for both monos.