You MUST call Kirk at Cary--, I did when I had questions about my Cary bias adjust. Go straight to him or their FAQ on their site.
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Actually, the SLI-50 is auto biasing and you should be fine as it runs in true class A mode. The SLI-80 does have bias adjustment and runs in AB-1 mode and is switchable from Triode to Ultra Linear Mode for different power requirements. You can call Kirk which is never a bad idea for peace of mind.