6550C vs KT88

I TOTALLY DISAGREE with most of the posts. I have a VT-100 MkII. I do not like the original Svetlana 6550s. I put Electro Harmonix 6550s in it, and love the result. As opposed to Killerpiglet's experience in a Rogue amp, I found the EH6550 to have more punch, tighter and more powerful bass, more detail and extension than any other tube I used. I also borrowed some Svetlana KT88s, which were highly matched, and I found them to sound too distant and undetailed. At this point, I was used to the EH6550, I need to point out.

The EH6550 is almost identical in appearance to a KT88, with the "coke bottle" shape. I have had NO reliability problems whatsoever. I have, however, heard that Svetlana KT88s are not the most reliable tube, especially in ARC amps. If anyone is interested in the EH tubes, I have a source for them at a good price.

KP, they were Svet 6550c's. Even more puzzling is that Rogue uses and recommends the EH's; so, your experience is unusual. Did you bias the amps for both tubes? I question that because you said the Svet's "ran much cooler."