Pioneer A-757 schematics

bzfcocon · 15th March 2006, 12:45 PM

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

I will be forever greatful !

Thanks
Liviu

Leolabs · 15th March 2006, 01:58 PM

Any problem with it???

bzfcocon · 15th March 2006, 04:12 PM

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 ?

CBS240 · 15th March 2006, 05:15 PM

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.

15th March 2006, 12:45 PM	#1
bzfcocon diyAudio Member Join Date: Mar 2006 Location: Bucharest	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 ! Thanks Liviu

15th March 2006, 05:15 PM	#4
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	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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15th March 2006, 01:58 PM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Any problem with it???

15th March 2006, 04:12 PM	#3
bzfcocon diyAudio Member Join Date: Mar 2006 Location: Bucharest	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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