Pioneer amp board with IC drivers.

[lazzer408]

This board was salvaged from a Pioneer VSX-D1S receiver. Thought I'd wire it up and give a listen. It sounds surprisingly good. The transformer was from some Logitech speakers and the rectifier/capacitor board was from the same receiver. Gives me about +/-28vdc.

The amp uses a uPC1270 driver IC rated at .003% THD. Pioneer specs on the amp are 25w/ch into 8 ohms @ .005% THD.

The uPC1270 is rated to +/-36vdc with a max output voltage of 23v.

 

[Mihkus]

with IC front and and bias network its a chipamp?

 

[jaycee]

Marantz also used to use this chip. It's not bad at all. However, it is now obsolete.

 

[lazzer408]

with IC front and and bias network its a chipamp?

Chipamp with a current follower?