Finding the right semiconductors can be a real challenge, in addition to all the failing electrolytic capacitors, of which there can be upwards of 100 in a larger receiver! There are a lot of Chinese knock-offs flooding ebay these days; these are parts that look correct (right down to the logos printed on them) but don't meet the minimum spec! So you have to be really careful and picky when rebuilding a vintage receiver- it will be an act of love and nothing else, since you will never get the cost of doing so out of the result, nor will it ever perform at the level that modern equipment does.
Old Classic Receivers: A Mistake to Buy?
I was contemplating purchasing a 70's receiver, as I used to love the construction and appearance of the Sansui, Kenwood, Pioneer, Marantz. However, when I ran this by an audio friend, he said, "Forget it."
He says: They sound terrible. The caps & resistors used before the early 90s' were dreadful. The electrolytics are drying up and will start crackling and substantially degrade the sonics. The switches and controls used were almost never sealed, so they deteriorate and make noise and can't be fixed even by taking them apart and cleaning them.
Tuners: He says that nearly all non-digital tuners used varactors, which go out of alignment and cause problems, so no old tuners, with the exception of the Mac MR-78 and possibly a few others, are worth dealing with.
I am tempted to believe all that he is saying is true, but I see a market for these items, and also know that people claim they are still using these pieces for 25 years.
What's the truth here? Can some of the techies enlighten me?
He says: They sound terrible. The caps & resistors used before the early 90s' were dreadful. The electrolytics are drying up and will start crackling and substantially degrade the sonics. The switches and controls used were almost never sealed, so they deteriorate and make noise and can't be fixed even by taking them apart and cleaning them.
Tuners: He says that nearly all non-digital tuners used varactors, which go out of alignment and cause problems, so no old tuners, with the exception of the Mac MR-78 and possibly a few others, are worth dealing with.
I am tempted to believe all that he is saying is true, but I see a market for these items, and also know that people claim they are still using these pieces for 25 years.
What's the truth here? Can some of the techies enlighten me?
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