Current Yamaha AV receivers (RX-V 559): what kind of output stage?

capslock · 24th April 2007, 04:15 PM

What kind of output stage and DAC does Yamaha currently use?

I peaked into an RX-V 459 and 559, and from what I could see through the lid, they are using 5 pin ICs. These could be real ICs or transistors with built-in bias diodes. Anybody know?

Also, there was an SSOP28 chip with the BB label, but I couldn't read the model. I assume that was the ADC, as they'd surely use an 8 channel DAC.

Background is that I need a cheap base for a 3-way active XO, and I like to modify my DACs and output stages.

jaycee · 24th April 2007, 09:09 PM

Probably Sanken SAP output devices, in which case the output is most likely an EF stage.

Leolabs · 25th April 2007, 01:30 AM

Search for the service manual of them might help.

capslock · 26th April 2007, 04:24 AM

Yes. if I had found a service manual on the web, I wouldn't have asked.

I also thought that those were SAP devices, except the writing on the PCB said ICxxx. I couldn't read the writing on the thingies themselves, unfortunately.

24th April 2007, 04:15 PM	#1
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	Current Yamaha AV receivers (RX-V 559): what kind of output stage? What kind of output stage and DAC does Yamaha currently use? I peaked into an RX-V 459 and 559, and from what I could see through the lid, they are using 5 pin ICs. These could be real ICs or transistors with built-in bias diodes. Anybody know? Also, there was an SSOP28 chip with the BB label, but I couldn't read the model. I assume that was the ADC, as they'd surely use an 8 channel DAC. Background is that I need a cheap base for a 3-way active XO, and I like to modify my DACs and output stages.

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24th April 2007, 09:09 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Probably Sanken SAP output devices, in which case the output is most likely an EF stage.

25th April 2007, 01:30 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Search for the service manual of them might help.

26th April 2007, 04:24 AM	#4
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	Yes. if I had found a service manual on the web, I wouldn't have asked. I also thought that those were SAP devices, except the writing on the PCB said ICxxx. I couldn't read the writing on the thingies themselves, unfortunately.

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