Put them in my ARC VS 115. Major upgrade over old stock 6550 "winged C" tubes in every way. Be careful: not all tube amps can take the extra current load. Check with the factory before dropping them in.
Thanks Bifwynne for the update. I'm heeding your advice before ordering the KT-120 tubes. I'm checking with Jolida to see if the stock JD-502P can handle the Tung Sol KT-120 to be sure.
They work great in my new Jolida JD502P...I talked to everybody except the janitor (unless I DID talk to the janitor) at Jolida before risking transformer meltdown and was assured it was fine...they do run hotter than 6550s, but sound more refined with seemingly more dynamic range and treble accuracy than the 6550s...not as much physical "tube glow" since the grids are less exposed, but that's OK. I now have the original 6550's, KT120s, and a set of new Svetlana KT88s (just got those) for the damn thing so off I roll!
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