Mike,
Not yet on the RCA/Tung-Sol 6550, but I look forward to the potential upgrade soon. I was disappointed to not find any on the tubeworld express site, which I thought would be an easy place to find a strong single. I'm already running the GE 6550 (I think late 70s? white label).
You got any opinions on the 1970s/80s 6H30 DR "super tubes" in the REF 6? Sourcing a good single for the power supply doesn't seem too bad, but sourcing a matched sextet for the amplification circuitry is a much tougher ask!
I think I'm going to stay quite happy with the combination of REF 6 preamp and Renaissance SE phono stage.
No opinions on this 6H30DR’s, other than I wish they weren’t so expensive and more readily available.
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