@mswale Too late, already sold and replaced. Oh, well. I was already considering an upgrade. Lucky you on a 50-year amp. What is it, Crown? Early ARC? An amp like that would be a conversation piece if you started a thread on the subject in this forum.
Amp showing its age?
Before getting into details, just the bottom line: can an SS amp, well into its second decade, begin raising its output impedance and/or dropping its peak current capability? Because mine certainly seemed to be doing one or both, so I have just replaced it, and now the speakers are again obedient.