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How to test how good my PSU electrolytics are in an old amp?
Hi,
I got hold of a 20yr old dead Adcom hifi power amp recently together with the service manual. The fuses on each +ve line have blown, the fuses on the -ve lines were ok. I have not tried the amp out - I have taken out these supply line fuses (between the psu and the main electronics), therefore isolating the power supply to the two amp boards, and checked the psu with a voltmeter and oscilloscope. The psu seems fine.... + and - 49.4V out, and all lines giving out about 10mV ripple. One rail had 20mV ripple. As this is quite an old amp, and I understand the electrolytics go first (after pots, swtiches and connectors), what tests can I do on the caps to see what kind of life I can get out of them. I can replace them, but if it is not necessary I don't want to do it. Thanks, guys. |
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