I've bought matched quads of power tubes from Tube Depot and have been very satisfied plus they have a large selection of 6550's.
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Danieljoseph- I know that the Upscale site states that they are no longer retubing the VT-100's(ie: on the SED 6550 and KT88 pages), BUT- has Kevin actually told you that he won't SELL you tubes? Perhaps that statement refers to THEM doing the retubing, rather than the owner? Have you actually called/e-mailed and asked?
Sad to hear that! The VT-100 can be hard on it's output tubes, somewhat convoluted to bias and requires matched quads. Perhaps Kevin weighed a possibly high failure rate's impact on his product's reputation against the ire of the ARC owners, and opted for the ire. I'm guessing, but- It's his business, his throat and his prerogative. Hopefully, you won't have any trouble finding reliable tubes through the vendors suggested in here and will be back to enjoying your music soon.