Amplifier Power tubes - important to sound?


i replaced all the small tubes on my mono amplifiers and now I'm left with replacing the stock Power tubes, kt88.

I like what I hear with 12 new small tubes - telefunken nos 12ax7 and 12at7. 

Now I am left with replacing 16 kt88 stock JJ tubes.   will Probably use Siemens 6550 nos.

How much will this impact what I hear do you think?  I recall hearing that power tubes don't make that much of a difference.

 

emergingsoul

Funny they aren’t mentioned yet but the Russian Winged C 6550’s are readily available nos for under $100 each. My favorite power tubes ,and I’ve tried many, are the winged c el34’s and kt88’s. 

@rzado 

Those prices are ludicrous. And I buy/sell that stuff everyday. And I feel horrible for charging HALF what those guys charge for that stuff. My god. Everyone thinks the crooks are on eBay when its more often than not the opposite.

TubeDepot's prices are outrageous. Their business practices are even worse. Years ago before I knew anything about anything I bought two pairs of tubes from them. RCA and Ei 12AX7, I still have the receipts. The RCA's that came were a short grey plate and a long-grey plate. The Ei's that came were a nickel plate and a smooth grey plate. I didn't know much then but I knew they looked different enough to warrant a phone call. So I called them asking if there had been a mistake or if I had ordered it wrong. They told me it was absolutely fine, it was intentional on their part, I had in fact ordered two RCA 7025s and technically they were both RCA 7025, and as such they were the same and that there would definitely be no difference in how one sounded from the other. Right, got it. Glad I paid an extra $6 per tube for balanced and matched tubes in addition to the $419.98 I paid for a pair of RCA tubes that weren't even a pair. Same with the Ei tubes. Though, I only paid $155.90 for the Ei tubes, which by way of comparison seems reasonable.

I still have all four of those tubes and the receipts. I use them as training/onboarding materials whenever I bring someone new on to explain which way our moral compass points.

I replaced a quad of E-H KT88 with Gold Lions a while ago along with all my phono and preamp tubes.  There was an overall improvement, but it's hard to tell how much was due to the power tubes.

Their contribution was undoubtedly significant. The Gold Lions are a good sounding, generally reliable and long lived tube at a very accessible price point. I ran eight of them for the better part of a decade in my own kit.