Old SS amps

Here are some solid state amps with cult followings:

- Bedini 25/25

- BEL 1001 Mk.IV

- Electron Kinetics Eagle 2

Still using a 30 year old Onkyo TX-8011 with Audio Physic Spark floor standers. While not the last word in resolution, the pair are musical.

I purchased them together, in the last trimester before my son’s birth, when I was told by other dad’s to buy what I want now, because I would be broke for the next 22 years. How right they were

Anyone remember Proton amps? They were a spinoff from NAD, which was itself a spinoff from AR. I remember the Proton sound was beefy and resonate, when they worked. Too often, they blew transistors.

ETA--Did anyone own Lafayette Radio Electronics equipment? That was my intro to "hifi." My neighbors bought their amplifier, speakers and a Garrard turntable. I was SO envious, and saved up $$$ from my newspaper route to buy exactly what they had.

I have a 40 year old Denon PMA 757 in my separate vintage system---I've only had it serviced once when the volume knob had a little static and one of the lights went out. Other than that---no issues. Still sounds great.

@OP As Hk_fan says above, it is brand and maybe even model dependent. If you are looking at twenty years plus, especially if it's a high powered amp, you can expect to be looking at a PSU reservoir caps replacement - though not necessarily immediately. A visual inspection will show if there are major dangers. However, caps are not the only failure point in an amplifier - e.g. rectifiers and output devices are also prone to failure. And replacement components are not necessarily available. So it's basically a crapshoot. Gear can on on for ages or it can fail. I've seen old Quad 405s get beaten to death in studios and go on almost indefinitely. You pays your money and takes your chances.

I am currently using a pair of McIntosh MC501s that I bought used 20 years ago.  The drive 3.6 Maggies beautifully and have been rock solid all this time.  I believe I could sell them for what I paid, although I have no reason to do that.  Build quality is a real thing over time.