RCA 6L6 black plate, Pre 70s, can't beat this valve, low mids and mids one of the smoothest, most liquid valves you will hear, they load up and BELCH like no other, in a push pull amp, single ended not so good.
RCA Small tubes, black plate, pre 70s. Best, rare, expensive, ( more of these are bad than good as far as sound, a lot these tubes are sold as good and balanced, but 10-20% is considered balanced)
5% 500.00-1000.00 pair, pure heaven
GE Tung Sol 6550 pre 65 (one of the best in MC60s) or Push Pull
Expensive valve, getting rare, I call these the KT88 killers, just a wonderful valve. Not the overall power of 88s just a classic TUBE sound but well controlled. The have a BELCH like a 6L6 RCA, They wind up and out comes the sound...Reverb Era!!!
GE 12at7 pre 70s, gray long plate, Quiet, good supplies ava. Can be a bit brash, take your time break them in, great top to bottom valve, good in a full range situation 20hz-20khz good prices..
GE 12az7 (Green) new issue excellent valve, clear mids and highs, reasonable price, good 12ax7, 12bz7, substitute, high gain.
Amperex one of the best small tubes around good supplies good matching,
Volvo, Mullard, EL34 KINGS if you can afford a set of early NOS.
700-2000.00 quads Also a lot of great EL34 valves NOW, use to be a big problem, KT77s took the lead for 10-12 years, now a lot of good EL34s valves at good prices.
Tellies can be THE BEST, great top to bottom valve 20hz-20khz, but, again a lot of valves that are just wore out, not balanced, not matched properly, are sold as good. Really don't do Tellies justice. Very tonal balanced valve.
El in a KT90 valves (beautiful valve), solvex kt88 both good valves, solvex can suffer from QC issues.
Regards
RCA Small tubes, black plate, pre 70s. Best, rare, expensive, ( more of these are bad than good as far as sound, a lot these tubes are sold as good and balanced, but 10-20% is considered balanced)
5% 500.00-1000.00 pair, pure heaven
GE Tung Sol 6550 pre 65 (one of the best in MC60s) or Push Pull
Expensive valve, getting rare, I call these the KT88 killers, just a wonderful valve. Not the overall power of 88s just a classic TUBE sound but well controlled. The have a BELCH like a 6L6 RCA, They wind up and out comes the sound...Reverb Era!!!
GE 12at7 pre 70s, gray long plate, Quiet, good supplies ava. Can be a bit brash, take your time break them in, great top to bottom valve, good in a full range situation 20hz-20khz good prices..
GE 12az7 (Green) new issue excellent valve, clear mids and highs, reasonable price, good 12ax7, 12bz7, substitute, high gain.
Amperex one of the best small tubes around good supplies good matching,
Volvo, Mullard, EL34 KINGS if you can afford a set of early NOS.
700-2000.00 quads Also a lot of great EL34 valves NOW, use to be a big problem, KT77s took the lead for 10-12 years, now a lot of good EL34s valves at good prices.
Tellies can be THE BEST, great top to bottom valve 20hz-20khz, but, again a lot of valves that are just wore out, not balanced, not matched properly, are sold as good. Really don't do Tellies justice. Very tonal balanced valve.
El in a KT90 valves (beautiful valve), solvex kt88 both good valves, solvex can suffer from QC issues.
Regards