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Do the tubes have to be matched?

I have a pair of ASL wave-8 mono blocks. Each one takes a pair of 6bm8 tubes. Right now i use 2 sets of matched Svetlana. I can get some nos Sylvania from a local electric supply house. But they have no way to match them or even test them to see if they work. At $28.00 each i wonder if it's worth it to get them. I have found there aren't that many choices of this style tube available even on the web. By the way these amps are auto bias. Thanks for your help.

Tommy
tommy583

Showing 2 responses by tommy583

tommy583 OP
73 posts
 
Ponnie,
Thanks for the tip. I emailed him this morning. His site was helpful and so were the links off it.
The tubes i was talking about above were in black and yellow Sylvania boxes that have a made in England stamp on them. The tube itself says Sylvania made in england, tested in USA. With codes KBV ef, OG2 B9B3 also on them. The guy at the store said they were made by Mullard.
I've never seen these one's on the net. I was thinking maybe i'd found some real rare nos tubes, but like Ontjesr said they guy can't test them let alone match them. If i could find someone with a tube tester around here that could help.
Tommy
tommy583 OP
73 posts
 
It would be nice if i could buy the nos Sylvania's then send them out for testing. But i doubt i could return them if they didn't test well. At that point i think i would be s.o.l. Bye the way since these are push pull amps do the tubes have to be matched?

Tommy
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