best output tubes for jolida 502b

vintage tung sol...no one else close

since the amp is new let the stock tubes stay in awhile to get used to the sound. my 502b came with stock eh 6550 and i later bought eh kt88. for the driver tubes i am using ge 6201 or mullard cv4024 in the 12at7 slots.
tungsol ecc803s in the 12ax7 slots. you can also sub 12au7 for 12ax7.

I have the SED 'Winged C' KT88's in my AES Superamp and they are wonderful tubes. They're a different sound, which is what tube rolling is all about, but just as enjoyable to listen to as some of the more expensive NOS tubes I also have.

I've always used NOS tubes, but when I wanted to replace the eight matched 6550s in my Cary mono-blocks, I almost went apoplectic! The prices have gone nuts on matched quads/octets of anything worth having(supply and demand strikes again). To my surprise and delight, The Winged "C" 6550's(St Petersburg plant) actually out-performed the Phillips octet that they replaced(more open and transparent). I wouldn't purchase output tubes from anyone but Upscale Audio. Their screening, and matching processes can't be beat! Kevin is anal about his quality control, and company's reputation(and I like that a lot). I have no other connection to them, other than as a very satisfied customer. Check out the test equipment/process descriptions he includes on his site:(http://www.upscaleaudio.com/product.asp?itemid=16&catid=85) Ask Kevin about KT88s in your application. You may be able to get a bit more output with them than with 6550s. Kevin will be able to advise you as to any differences in sonics between the two. Happy listening!!