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Old 23rd January 2004, 03:32 PM   #1
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Default Denon PMA480R amplifier

I have one of these and replaced the only two opamps inside it that I could replace easily. I used DIP sockets incase I wanted to try other IC's. I used OPA2134's in place of the JRC 45xx that was there. Sounds far better now. Especially after burn in for 5 days !!
That's at least about 75 hours 'On' .

Does anyone have a circuit diagram for it. I find that using the tone defeat button causes significant volume shift AND it does not sound the same ! So tone defeat button In / Out sounds different . I wanted to try and figure out why .
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Old 5th March 2004, 09:16 AM   #2
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Default I'm looking for the same

Hi there

Did you ever get a reply about the service manual or circuit diagram? I'm looking for the same thing as I want to do a few mods.
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