The VAC amps I've owned were very easy to bias, no tools needed. No meter, no screwdriver. Of course I also owned BAT tube amps which were auto-bias....even easier.
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Atma-Sphere is part auto-bias and part manual. IOW the bias is automatic but you still use the onboard meter to set the DC Offset (there is a single DC Offset control because the output of the Atma-Sphere amps is direct-coupled). Drift is low, so the control need only be adjusted once every few months or so. Unlike a bias adjustment the DC Offset is not a critical adjustment.
Yes, but the Cary has the meters in the front and the bias adjustment screw in the rear. Who thought that up? That's what has kept me from buying a Cary amp, I have a Cary preamp. The rear on my amp is not easily accessible.
VAC has the meters AND the adjustment knob (no screwdriver necessary), right up front where they belong. So simple an idiot like me can do it!