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Yamaha MX-1 Hyperbolic Conversion Amp

txjazzman

txjazzman

Active Member
I am looking for a discontinued IC for a Yamaha MX-1 power amp. The IC ID number is BA3122N. Yamaha refers to it as a Hyperbolic Conversion Amp. The Yamaha part number is XG609A00. Does anyone have one or know where I can get one? Thank you
 
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txjazzman said:
I am looking for a discontinued IC for a Yamaha MX-1 power amp. The IC ID number is BA3122N. Yamaha refers to it as a Hyperbolic Conversion Amp. The Yamaha part number is XG609A00. Does anyone have one or know where I can get one? Thank you
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PM @clinic-audio He may have one.
 
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brutal said:
"The Yamaha AX-730, AX-930, AX-1050, and AX-1070 used the BA3122 N HCA IC and it is believed it was used in the AX-1090, but this is not so far confirmed."

I have to think they're a pretty durable IC considering what some of them have been through.
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Bratwurst7s said:
AX-1090 = Confirmed. IC 603 & 604 = XG609A00 = BA3122N.

Cheers,
James
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zaibatsu said:
If you're sure it's the IC that's failed and the other sources are dry, I have an AX-930 parts unit here and can throw the IC in an envelope for you.

Can't confirm it's working but happy to test if instructed how.
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I will PM you shortly. Thank you
 
Lucky find.

I traded one of my two NOS BA3122N for sme other hard to find transistors a few months (?) back.

Not gonna let go the other one.
 
zaibatsu said:
If you're sure it's the IC that's failed and the other sources are dry, I have an AX-930 parts unit here and can throw the IC in an envelope for you.

Can't confirm it's working but happy to test if instructed how.
Click to expand...
I am just checking to see if you are getting my messages?
 
I've replied to your message.

I've got some measurements from a known-good one now, so I'll pull and test mine to compare values when I have a chance.
 
In case it's useful in future, I made a little graphic on testing it:
BA3122N_test.png

Thanks to bmanone for sharing his measurements here.
After looking at the schematic I also checked for diode drops across pin 1-3 (0.67V) and 7-9 (0.65V), with negative lead on pins 1 and 7 respectively.

My actual resistance measurements are below in brackets also:
Pin 1-2 ~1.4 kΩ (1.401 kΩ)
Pin 2-3 ~1.0 kΩ (0.982 kΩ)
Pin 3-4 ~1.0 kΩ (0.964 kΩ)
Pin 4-7 ~1.0 kΩ (0.965 kΩ)
Pin 7-8 ~1.0 kΩ (0.970 kΩ)
Pin 8-9 ~1.4 kΩ (1.391 kΩ)
 
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