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Degrade in sound over 48 hours. What happened?

Retermination of all connections, complete with Kontakt Electrical cleaner on all terminations and RCA plugs. System is vintage/new combination. Yamaha CR220 15 w/ch receiver 1979. NAD C520 CD player 1999. Bang and Olufsen S35 Type 6311 2-way loudspeakers. AQ Viper RCA 1 meter to CD. AQ CV-4, AQ Type 4 (single run of each, 17.5 feet to speakers). 30" Paradigm Premier metal stands. Monster Gold-Pin connectors (twist type) at receiver. Standard B&O speaker (2 pin) plugs. Result on Saturday was open, very wide soundscape with low lows and clear highs--almost a reverb effect in sound. Monday sound is noticably harsher with muddy bass and distorted highs and loss of quality sound imaging. Only have a basic 6-outlet power strip without any filtering, ect., and all components are non-IEC cables. Any ideas on what caused the sudden loss of fidelity? Seems that the receiver needs more volume than before to get the same sound level a few days ago. It's loud now but not as clear.
rodargent

Showing 1 response by gs5556

gs5556
1,241 posts
 
Substitute, if you can, another IA and cdp without the power strip into your system and see if the problem is duplicated to confirm a power problem. But I don't think it's an A/C issue...

It's very possible it's the receiver (I'm assuming you reterminated with correct polarity). Could be worn out power supply capacitors, especially after 25 years. Other possibilities are damaged cable terminations or a problem with the input/output jacks on the receiver. See if lightly tapping or pulling on the input and output cables near the back connections result in a popping sound. Or try tapping on the volume knob and see if there's static/grunge.
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