Tung Sol 6550 vs. GEC/Genelex/Gold Monarch KT88


Anyone have experience rolling these tubes, and would you comment on their sonic characteristics? I'd be using them in a VAC Phi 110 push/pull amplifier with Sylvania 6SN7 WGTA driver tubes.
tvad
I tried GE6550a tubes in my VAC amp, and there was not enough difference to warrant the $250 expense. Frankly, I preferred the stock Chinese KT88s...they had more extension and tighter bass.
711Smilin, this hobby (or addiction) is filled with components and tweaks that are insanely expensive, and add just a little more greatness to a system. This is what the Genelex Gold Monarchs do. With the Gold Monarchs in the VAC amp, there is a little more "magic" to the mids and sweetness to the highs. I don't find it romantic, or bloomy, but just more "real". Bass is still deep. Soundstage is very open.

Honestly, I could live with the stock VAC tubes if I had to, but the Genelex Gold Monarchs are better, and worth the expense.
Does anyone have an opinion on the EH 6550 tubes? I bought a couple of matched quads for what seems like a great price shipped form the Audio Pimp. Then I got the VTV issue, and they didn't even test them. I'm still waiting for my amp to come back from repair to try them, but wondered if anyone has prior experience with them. They're the fat bottle versions.
Thanks,
David