Amp: Can I mix tubes from different manufacturers?


I have a KR Audio VT8000 monos power amp which use a pair of 6550 (or KT88) for each mono amp.

I had a very expensive quad set of KR KT88 tubes but one of the tubes recently failed and thus leaving me with only 3 KR KT88 tubes. I do have a quad set of GE 6550 A and a quad set of Gold lions 6550. I do not want to invest in KR tubes anymore.

My amp is self biasing (auto bias).

My question to you guys is: can I complete the quad set in my amp by supplementing the 3 KR tubes with another non-KR tube (i.e. Gold lion 6550)?
Are there any likely technical complications for my amp or speaker other than potential degradation/differential of sound quality? Or maybe I can mix and match the KR and Gold lions in each monoamp (i.e. one KR and one Gold lion in each mono) thus giving me a identical channel outputs from both speakers.

Many thanks for inputs from those with first hand knowledge about such permutations.
lall

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