Guru
Joined: 05/03/2018
Location: NetherlandsPosts: 4271
| Posted: 06:39am 24 Oct 2024 |
Hi Marcel,
Remarkable that the one audio channel has the 0.5 ohm resistors okay, and the other channel seems they are burned. Maybe you should check the burned channel if all resistors are okay, maybe it has a high bias current.
I love this way of construction. You remove the bottom, and have access to the whole PCB. All for service. Our government talks and talks about sustainability, durability, and we produce only consumer goods (throw away, not repair). I also have (slightly more modern) radio's that are full functioning, only potmeters needs some maintenance. And now the government decides to drop FM broadcast in 2027. I can throw this good equipment away and buy consumer goods... DAB++ radio (that probably dies in 5 years).
It is good you bring this SA-616 back alive....
Volhout
P.S. I have restored a 1957 Philips power supply (0-30V 300mA) that has qa quite expensive looking potmeter to adjust. And it does not show any sign of "crackling" or bad linearity. That is a surprize. That power supply is solid state except for the reference voltage, that is a tube. Apparently they could not make good stable zener diodes in 1957. So there is an extra high voltage transformer for this 86V tube reference.
P.P.S. I recognize the white plastic box. Babi Pangang, Fou young Hai ?
Edited 2024-10-24 16:50 by Volhout