Welborne Labs

Posted by Douglas Bolt on May 22, 2003 at 18:41:18

In Reply to: Apollo owners - any experience using different output tubes posted by toledo on March 14, 2003 at 22:43:10:

I realize I'm 2 months late joining this thread, but here goes.

I have had KR842's and KR52BX in my Apollo II's. Overall, I think I like the 842's better than the 52's, although the 52's have more bass. Either sound really nice.

Tube live has been a problem, but Ron recently tweaked the amps to bring them up to specs of the latest revision, which includes lowering the current a bit. That should extend tube life a bit. It is my impression that the amps running 52's now sound better than before the upgrade. I am starting to look for a set of tubes to replace the 52's once they go bad, but I'm not yet ready or knowledgeable enough to decide on either a tube design or manufacturer. Any suggestions on manufacturers?

I had a KR52BX go bad a few months ago and Mrs. Kron replaced the tube with no hassles.

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