GZ34/5AR4 tube


which GZ34/5AR4 nos you prefer ?  - quicksilver silver mono KT88 (90watt)

Any of the US, British and Japanese made in the 50's, 60's and 70's. They possibly have a longer life span than current production!
I prefer vintage ones (even used) as long as they test good for emissions!
Hunting down a NOS, Mullard GZ34, from the Blackburn plant, would be well worth the time/effort/cost. Excellent sound qualities and may outlast the equipment, in which it’s installed.
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I think I choose mullard..

Many thanks!!!