Responses from digitalgon

Mcintosh C2700 warmup light
oh nevermind, it was one of the vintage tube that has dirty butt and reflects darker yellow or amber color.  When I roll the tube the color changed.   
Vertical bi amping Mcintosh MC275 and Rotel RB-1582 MkII
28 dB of gain on the low frequency or mid-high amp?Is there a simple dial to control gain?