I see on other photos - that's such a capacitor!
in my amplifier it is not! - it should be?
What is its value and current ?? tell me who knows !! ??
There is another question - whether you need to do the grounding at the main entrance see attach
in my amplifier it is not! - it should be?
What is its value and current ?? tell me who knows !! ??
There is another question - whether you need to do the grounding at the main entrance see attach
Attachments
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The capacitor looks like a noise filter, perhaps added as an afterthought.
It is likely to be something like 0.05uF to 0.22uF, 100V.
This unit is class II wiring, so no utility IEC ground is needed.
Class II (IEC) means there should be at least 2 layers of insulation between you and the mains supply conductors and there is no protective earth wire or connector. Modern equipment will also have security fasteners to prevent tampering. Here though, it can only refer to a 2-wire mains connection and outlet sockets. With such old equipment, I think it is actually a class O appliance though that term is not commonly used.
Appliance classes - Wikipedia
As it was originally supplied with only a 2-pin plug and flex as the schematic shows, don't attempt to add an earth connection to the chassis now, as it probably wasn't designed to work with one and it's likely to cause hum. Some countries have floating or balanced AC supplies and others have MEN (AC Neutral side is earthed) so it is unwise to assume that protective Earth will be safe to connect to anything unless you know the local power system and rules governing appliances. For your personal safety, I would have the amplifier's mains wiring and transformer checked for leakage current with an approved appliance tester anyway. See an electrician about that.
It should be said that it is illegal in some countries for unqualified people to work on double insulated equipment and diyAudio rules (Note 4) requires that we explain the risks.
Appliance classes - Wikipedia
As it was originally supplied with only a 2-pin plug and flex as the schematic shows, don't attempt to add an earth connection to the chassis now, as it probably wasn't designed to work with one and it's likely to cause hum. Some countries have floating or balanced AC supplies and others have MEN (AC Neutral side is earthed) so it is unwise to assume that protective Earth will be safe to connect to anything unless you know the local power system and rules governing appliances. For your personal safety, I would have the amplifier's mains wiring and transformer checked for leakage current with an approved appliance tester anyway. See an electrician about that.
It should be said that it is illegal in some countries for unqualified people to work on double insulated equipment and diyAudio rules (Note 4) requires that we explain the risks.
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Perhaps you need the service manual to identify components. Free membership and downloads here: Luxman SQ-505X - Manual - Solid State Integrated Amplifier - HiFi Engine
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