Have you talked to Mark at Rogue?
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I upgraded my 150 to 180 about 6 months ago and continued to use Golden Lion KT-88 output tubes. As I understand it you do not get the extra 30 watts of power unless you go to the KT-90 tubes. I have enjoyed the upgrade - dynamics improved and soundstage seems bigger and more open. Is it worth the cost - I think so and so does the reviewer at Stereophile (for what it is worth I think they put the 180 in Class A and it was in the running for amp of the year in the most recent addition)but as always YMMV. Also have you tried KT-88 output tubes, I have not used my 6550 tubes in awhile but I do remember the bass becoming tighter and more natural with the KT-88. Good Luck.
I have compared [at a friends house] 150s vrs 180s side by side, and even swapping tubes from one amp to another to keep variables the same. the 150s are warmer and rounder in and old school tubey way, the 180s have more extension from top to bottom with a wider deeper soundstage, and with string instruments it was like taking a blanket off the speakers, way more lifelike attack and sparkle, making the 150s sound rolled off and dull by comparison. this was with revel gems for speakers and bel canto dac 3 front end. I would say for most people the 180s are a great upgrade.