new production 6550 kt88 very very good now... not sure NOS is the ticket unless you like to burn extra money
check out kevin deal or jim mcshane sites
to offer more exacting advice, i would need to know your intended amp, speakers and what you are looking for sound wise
check out kevin deal or jim mcshane sites
to offer more exacting advice, i would need to know your intended amp, speakers and what you are looking for sound wise