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In Reply to: RE: Audio Research LS-27 preamp tube replacement posted by audioman on February 25, 2017 at 15:38:53
you'll want a back up set on hand anyways.
"I know just enough to get into trouble. But not enough to get out of it."
Keep in mind that some Audio Research models are rather hard on tubes. Perhaps that was what the dealer was alluding to?
While it's true that ARC pushed 6550 output tubes in the day, the LS27 (like my SP20) is a hybrid with the 6H30s serving as cathode follower buffers for the JFET front end. And the tube itself was designed by the Russians for military duty.
It's a darn rugged tube. Arguably, the most knowledgeable expert on the use of the tube is an inmate here who pioneered the use of them in audio electronics. Search for posts by Victor Khomenko of BAT.
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