KT88s...the final chapter

I prefer Sovtek KT-88 over Svet 6550C and Svet KT-88 over Sovtek KT-88. However, I prefer Penta KT-88 over Svet KT-88 and their price is somewhere between Sovtek and Svet. Since you are using 6550C, the Sovtek KT-88 would most likely give you satisfactory results. However, if I were You, I'd pay little more to get Penta. However, if your amp were voiced exclusively with 6550C, all bets are off.

Try http://www.thetubestore.com/kt8890100types.html for objective evaluations.

have not read extensive posts on this subject. but i have talked to a lot of tube dealers and some equipment mfgs. an expert i am not! here are my findings.

gold dragons are just select current mfg tubes. rogue uses kt88s in their magnum upgrade that are supposed to be select and matched for him. 300$ per 8. mark states that these are much better than the svet or sovtek. he also stated that they had good success with electro harmonix 6550 "tun-sol like in sound".

tube dealers all seem to say best kt88 is nos m&o and best 6550 was tun-sol. during the years of there respective hay day. i am saving to buy some used tun-sols (that test good)and should last many many years to come. as all stated these were the best sounding of the bunch. good luck

Jvr, I find it amusing how dealers will often say the most expensive tube is the best sounding.

Based on my very extensive experimentation, I can only conclude that different types of tubes sound different in different amps. I have come to regard tubes as a separate component in my system that needs to be matched carefully to everything else, just like you would match any other component in your system.

You may or may not like Tungsols. In most of the amps I have tried, they sounded pretty dry. Personally I prefer GE 6550's from the old stocks (yes, even over the Gold Lions). But then again, this will depend on your particular configuration.

A small note about the Svets: I have not tried KT88's, but in the case of 6550's I have found that they are hard to bias properly in a lot of amps. At 'normal' biasing points they might sound poor, but unexpectedly can really SING at some weird bias setting.

I have some interesting things to ponder.Any suggestions on used NOS TESTING 85% +.