Vintage Asylum

Pioneer H-Z1 capacitor covered by crystals

38.42.108.238

sdvinin

Today, while cleaning the MC head amplifier and removing degrading and stinky EMI/RF isolation foam pads I noticed four capacitors are covered in crystals. The crystals are easy to scrape but not very solvable in isopropyl.
Is it normal? If I need to replace them what kind of capacitors are they?
The text on them says A470J SOSHIN

Follow Ups:

RE: Pioneer H-Z1 capacitor covered by crystals - JonM 03:13:59 04/07/24 (1)
Looks like they are silver mica. See link below. Not sure about the crystals. The coating others have seen (again see link) seems to be harmless and the capacitors are fine. I'd clean them off and if the amplifier works, I wouldn't worry about it.
- Soshin Silver Mica Capacitors (Open in New Window)
- RE: Pioneer H-Z1 capacitor covered by crystals - sdvinin 16:00:04 04/07/24 (0)
  Thank you for the link. Looks like hoshin's silver mica capacitors are not dipped but covered with some kind of wax that over time create a build up. I cleaned them and they look normal now. I do not hear the difference in the amp sound.
RE: Pioneer H-Z1 capacitor covered by crystals - Triode_Kingdom 23:14:32 04/06/24 (0)
A photo would help.

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