i recently installed mullard NOS 12at7s in my mb185s (from upscale audio)at about 35 a pop. substantial improvement everywhere. stick with the 6550s and try the winged Cs. they are very well balanced
VTL 75 75 deluxe amp...... Input/Driver tubes????
I purchased a VTL 75/75 Deluxe power amp serial number 7575022 and it came with 4 12at7 input/driver tubes. (output tubes 6550Cs). Some have suggested 4 12bh7s others have said 2 12at7s as input tubes and 2 12bh7s as driver tubes....others have said 6414 driver tubes. HELP!!! does any one have a copy of the manual. VTL has not answered emails. Thanks Larry Unruh