Parasound HCA-750a Schematic Needed

[Brad1234]

I recently got a Parasound HCA-750a amplifier and have been searching online for a schematic for it with no luck. Anybody know where I could find a schematic? It is working fine but the sound could be improved. Eventually I will recap it but was looking into changing the feedback resistor to an ultra precision Vishay, I did that on my Parasound HCA-3500 amp and it was an incredible improvement in sound quality. Any thoughts on that or assistance in locating the feedback resistor in the circuit?

 

[eiraved]

Vintage (Discontinued) Models

← Recently discontinued products Model Features Specifications Manual Supplement RS232 Education Pack AVC1800 Manual Education Pack AVC2500u View View Manual RS232 CBD2000 View View Manual CDC1500 View View Manual Education Pack CDP1000 View View Manual Education Pack CDP2000 View View Manual...

parasound.com

 

[Brad1234]

Vintage (Discontinued) Models

← Recently discontinued products Model Features Specifications Manual Supplement RS232 Education Pack AVC1800 Manual Education Pack AVC2500u View View Manual RS232 CBD2000 View View Manual CDC1500 View View Manual Education Pack CDP1000 View View Manual Education Pack CDP2000 View View Manual...

parasound.com

Thank you so much eiraved!!! That is exactly what I was looking for.

 

[eiraved]

Thank you so much eiraved!!! That is exactly what I was looking for.

I'm glad I could help. Let us know how the work on the HCA-750a amp turns out!

 

[mcgjohn]

If you are going to replace the fdbk resistor with vishay you may want to also do the loading resistor at the input.

The sonic signature of the amp is derived from all the PS bypass caps. Most are metalized film. If you replace them with film and foil you should improve the soundstaging of the amp.