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Denon PMA-450
Denon PMA-450
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Old 10th November 2018, 08:39 PM   #1
bkneale is offline bkneale
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Default Denon PMA-450

I have just repaired a Denon PMA-450 amplifier and would like to adjust the bias. Unfortunately, I am unable to locate either the service manual or even the circuit diagram.


There are the usual two variable resistors: one for each channel. However, for each channel there are two monitor points. The output transistors are 2SB1560 and 2SD2390 with four 0.1ohm 3W resistors which I think are in series?


Any help would be gratefully appreciated.
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Old 10th November 2018, 09:10 PM   #2
aparatusonitus is offline aparatusonitus  Croatia
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Download Denon PMA-350SE service manual from hifiengine and see if the circuit matches PMA-450. Denon PMA-350 - Manual - Stereo Integrated Amplifier - HiFi Engine
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Old 11th November 2018, 03:47 PM   #3
bkneale is offline bkneale
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The Denon PMA-350SE is nothing like the PMA-450. I had already checked the service manuals on the hifiengine.com website and was unable to find anything similar to the PMA-450.
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