Great Pioneer Tuning Fork Suplement - NSA Amps and Receivers

[AstroZon]

Here's a link to a scanned Tuning Fork Suppliment for Pioneer Non-Switching Amplifiers (A-60/70/90 amps and SX3 - 8 receivers.

http://www.cieri.net/Documenti/Altri marchi/Pioneer - Tuning Fork No.2 (supplement) (~1980).pdf

It contains a nice history of solid state design and then troubleshooting.

 

[goat67]

Thanks for posting this

 

[llwhtt]

I've never been in an Pioneer NSA before, now I'm really interested in checking out one. Thanx AstroZon!

Craig

 

[AstroZon]

You're welcome. This is one of the more interesting service guides that I've ever seen. Page 16 it even shows what the function of each sub-circuit does! I wish more schematics did that.

It also shows that the A60 - 90 series amps, the A5 - 9 series amps, and the SX 7 - 9 receivers all utilize a nearly identical circuit architecture. The A90 amps are getting crazy prices nowadays - like over $1k. A couple of years ago, I picked up an SX-7 receiver for $30, and there's one on eBay right now for $50. So if someone was looking for one of Pioneer's NSA amps, they'd do well to find an SX-7 - 9 receiver (that is if they don't mind the rack-system looks.)

But looks aside, I really like my SX-7. The only thing I don't like is the digital volume control. I always want something between 6 and 7, and it's not there!