I am restoring an old 1960s Sanyo reel to reel tape recorder, replacing most bad electrolytic capacitors.
On the preamplifier there are ten Rubycon 6.3V 4.7uF electrolytic capacitors. I assume it is old school markings. Most are are testing around 6 to 8uf. That's probably OK except the ESR of 3 to 4 ohms is probably too high.
The problem is that I cannot find 6.3V
replacements. I searched every where. The closest I can find is 50 or 63V 4.7uf capacitors. Will this be OK to use or should I go for 10uF 16V Nichicon Gold hi-end audio capacitors?
Tolerance values are high, I think around 20% or so on these old capacitors back in the 1960s.