Reply To: Beomaster 4400 – Sudden drop in sound?

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Have you checked the thermal compound and mica insulators?

Sometimes, the thermal compound is fine after decades, other times it has dried out and shouldn’t be trusted.

Mica insulators can split between layers. These will look like there are air bubbles in the mica. Mica is a good thermal conductor, air is a good thermal insulator.

Disassembling, inspecting and replacing the thermal compound with modern, higher performance compound doesn’t take that much time. Even if it wasn’t needed, it can provide peace of mind.

Addition:  The above comments are primarily targeted to the power supply components. These might affect both channels simultaneously. Also, if you have a FLIR camera, it is really useful for debugging potential thermal issues.


  • This reply was modified 4 weeks, 1 day ago by Glitch. Reason: Add some clarification