From what I see in the photos, I do not believe the amp has sufficient ventilation. It has 8 KT150 tubes after all AND the preamp is right above it where it also has the bare minimum of space above it. I think you are cooking the preamp and most likely the amp as well IMHO.
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Digital W4S DAC-2v2SE, W4S Recovery powered by Uptone Audio LPS-1, OPPO BDP-105; Office: iFi micro iDAC2 Home Office: iFi nano iDSD with iPurifier2
Analog Rega Planar 2 (original) heavily modified; Benz Micro Ace; Aesthetix Rhea phono pre-amp
Pre-amp/amp Audio Research REF 5SE, Audio Research REF 150, Martin Logan SL3s, Shunyata Research power cords throughout
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