Depends a bit on what you’re getting for tubes I suppose but price wise 12x 6L6GC will usually be fairly comparable to 6x 6550 from the same brand/product line.
Using JJ pricing as they’re some of the cheaper ones available right now, but AES has single tubes at $26.95, matched pairs at $56.90, matched sextets at $170.70, and if you do the extra burn in a sextet is $179.40. My past experiences with retail JJs I would absolutely pay the extra $10 for extended burn in with those. So that’s $358.80 for two matched sextets.
For JJ 6550 you’re looking at $56.95 each, $116.90/pair, $350.70/sextet, or $359.40 for a burned in sextet.
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Owning and operating a tube amplifier is like owning a classic car. You probably are not going to have it as your daily driver unless you got money coming out of your ears. Most of us don't so we're going to keep it as the nice weather Sunday afternoon drive it around pedal to the floor occasionally to keep it happy.
I only use my tube amplifiers on outdoor gigs for that extra umph and we don't always play outdoors except in the warmer months. I also do all of my own repairs as I have the background and capability with access to resources at each manufacturer to get pretty much whatever I need most of the time. So I'm the exception don't go by me haha!