Call Kevin at Upscale Audio for much better prices on all the ARC tubes you will need. He tests for everything ARC does, but go ahead and ask him for a detailed explanation. He sells all kinds of 6550's or KT-88's and of course all kinds of different 6922's. Website is www.upscaleaudio.com and make sure to phone not email for a fast response. One thing to remember: after you retube your ARC, you or someone will need to rebias the amp for the new tubes. When you send the amp to ARC for retubing, obviously they do this, but if you are going it alone, you will need to bias or have an ARC dealer or someone w/knowhow do it. I've never done it myself so I can't tell you how hard/easy it is. The VT100's are not self-biasing so it'll have to be done by someone.
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