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PrimaLuna ProLogue Two - mixing tubes?

I have a newer quad set of SED 6550Cs that I've been using as a replacement for the stock KT88 tubes. I decided to take advantage of the auto biasing feature of this amp and run one 6550 and one KT88 per channel, only because one of the stock KT88s is bad. I'd like to use up the other two good KT88s. I've read that this is acceptable with this amp, but I'm not sure if this will have negative impact on the 6550s. I plan to rotate the 6550s so that I still have a somewhat matched quad set of them. Has anyone done this before, and are there any pitfalls I should take note of?

Thanks
jwglista

Showing 1 response by hifihvn

hifihvn
943 posts
 
Also,if you swap the two tubes on the same channel,one of them may/will(depend on amps&tubes)over dominate the other sonically.IT depends which one is in the push,and pull sockets.So,if you like the sound of one tube type more than the other,rotate the two within the channel,to see if you get a blend of the two you like.

For amps that could use a 6550/KT88 type,or a 6CA7/EL34 type,I do not think a combination of a KT88,and an EL34 would be good in the same amp.The tubes out of its design types are to far apart.Ask the manufacturer first, although I wouldn't myself.
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