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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 rar1

rar1's avatar
rar1
1,816 posts
 
So, thinking aloud ...

the two 6550's in use will have more wear on them. I had absolutely no luck with SED Winged Cs when it came to tube life and my PL2 (a few hundred hours), so wear & tear may enter this.

if you use the 6550s in an amp which requires biasing, there may be some differences in the bias values.

if this is a short term thing, I would not worry about it.

Rich
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