350b,
When I was primarily using my push pull amplifier (6550/KT88) failing tubes were a problem with various brands. I had the most sucess by far with the SED Winged C 6550. In contrast, my SET amplifier uses the 300b tubes which are 100% reliable(so far after 4 1/2 years) and are true work horses in comparison( and sound much better).
Charles,
When I was primarily using my push pull amplifier (6550/KT88) failing tubes were a problem with various brands. I had the most sucess by far with the SED Winged C 6550. In contrast, my SET amplifier uses the 300b tubes which are 100% reliable(so far after 4 1/2 years) and are true work horses in comparison( and sound much better).
Charles,