It depends on the quality of the original - how good are the parts? How conservatively are they used/specified? I have 100s of products out there and the basic answer is "30 years and counting".
The limiting factor in a good product is electrolytic capacitors. 20-30 years, iff they are very good and run well below their rating, is typically life. But i've pulled 30 year old caps that are leak-free and working well.
You *can* have it re-capped but that is labor intensive and costly. I've recently done or had done for folks, about a dozen.
Or, of course you can play some roulette and let stuff fal and then fix it. The concern with unfused speakers is that you could do some downstream damage.
All my main gear is 25+ years old (of my own design, mostly prototypes that I keep) and works a treat. Of course i have friends in low places.
G
The limiting factor in a good product is electrolytic capacitors. 20-30 years, iff they are very good and run well below their rating, is typically life. But i've pulled 30 year old caps that are leak-free and working well.
You *can* have it re-capped but that is labor intensive and costly. I've recently done or had done for folks, about a dozen.
Or, of course you can play some roulette and let stuff fal and then fix it. The concern with unfused speakers is that you could do some downstream damage.
All my main gear is 25+ years old (of my own design, mostly prototypes that I keep) and works a treat. Of course i have friends in low places.
G