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The 555 was built like a tank. I have mine, the original version, for almost 20 years and I have never experienced any problem. Even the capacitors appear to be still in excellent shape for it can keep my floor standing speakers going for a long time after its switched off.
There is nothing wrong to spend maximum $200, or 50 cents per watt, to get one in good condition. Packed with 350 WPC into 4 ohms, it will certainly do your future Studio 40 good, but for $500 you deserve much more.
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