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Pioneer A-757 schematics
Pioneer A-757 schematics
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Old 15th March 2006, 12:45 PM   #1
bzfcocon is offline bzfcocon  Romania
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Default Pioneer A-757 schematics

I am looking for the Pioneer A-757 schematics (or service manual), does anyone have it ?

I will be forever greatful !

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Old 15th March 2006, 01:58 PM   #2
Leolabs is offline Leolabs  Malaysia
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Any problem with it???
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Old 15th March 2006, 04:12 PM   #3
bzfcocon is offline bzfcocon  Romania
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Actually, no. The thing seems to be built for ever (I know it's not)

Someone suggested me a few tuning/upgrade ideas and i am willing to try, but not "blindly". Modifications range from changing a few capacitors to replacing the whole power modules. Without the schematic, I can't really appreciate if it is worth it or not. The PCB is considered to be a weak point of the amp, as being too "messy" with lots of straps, so it is difficult to retrieve the schematics from the PCB.

Specificallly, a capacitor in the negative feedback loop has been mentioned (the one between the inverting input of the differential input stage to the ground). Changing this to a non-electrolityc one shoud improve sound.

I am new to this forum, maybe there are people that did some tuning to "stock" amplifiers here ?
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Old 15th March 2006, 05:15 PM   #4
CBS240 is offline CBS240  United States
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If by tuning you mean replacing worn out cheap stock parts with newer hi quality parts, then yes. People do this all the time with cars too. Scematic would be helpful.
All the trouble I've ever been in started out as fun......
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