Mike, c-j is a great place to get them because they carefully test each tube but they are a bit pricey. I bought mine at Tube Depot. Nice folks that stand behind the product. Get a set now and keep your 6550s as spares.
Bob
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Wilson Yvette speakers, Conrad-Johnson ART88 pre, TEA1bc phono, and ART27A Amplifier, Marantz digital player, Rega Planar 10 turntable / Apheta 3 cartridge,Wireworld Gold and Platinum Eclipse IC and speaker, I AQ Hurricane, Tornado power cables, Shunyata Denali 2 conditioner, dCS Bartok DAC/Streamer
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