I bought this used RF High Frequency (gigahertz) shielded in-line amplifier box off Fleabay.
It was re-purposed into an audiophile amplifier. It was primed and painted a very dark textured brown. The fins were enameled copper and the copper pipe & wire accents were added. The photos are dark, but there is a black powder coated, solid brass volume knob on the front. Black machined aluminum spikes adorn the bottom of the amp.
Inside is a TPA3116D2 amplifier board which is good for about 35 watts per channel depending on how much voltage one feeds it.