Bob,
Thank you! This is very helpful and insightful.
I'm already down the path of testing a tube at a time each time I start up the amp to listen, so I'll avoid excessive on/off switches of the amp.
The tip about the four front/rear KT88s will be a real time saver in the future. Really appreciate you finding that correspondence. I did a bit of searching here on AA and missed that.
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Sources: Vinyl: Clearaudio Innovation Wood turntable with 9" Universal tonearm, Da Vinci V2 cartridge, Stillpoints SS & Stillpoints clamp, McIntosh MVP 901, Apple Mac mini via Benchmark DAC 1, Aurender N100C via Schiit Yggdrasil
Control: McIntosh C1100, Mcintosh MX151
Power: Mcintosh MC2301s (front), McIntosh MC501 (center), Mcintosh MC402 (rear)
Speakers: Sonus Faber Amati Futura (front and back), SF Vox center
Power/connections: PS Audio Power Port receptacles, RGPC 400 pro (2) WireWorld interconnects and speaker cable
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