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Yamaha R-3,RX-300 bias adjustment
Yamaha R-3,RX-300 bias adjustment
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Old 19th February 2006, 02:24 PM   #1
spongebob-2005 is offline spongebob-2005  Germany
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Default Yamaha R-3,RX-300 bias adjustment


I need values for bias adjustment in the amplifier section. I think about 9 mV must be ok. Has anyone an exact value or schematic?
Thank you.

- Boris
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Old 18th November 2006, 01:21 PM   #2
gni is offline gni  United States
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Default Bias Adjustments

Check your resistors. . .let's say 0.22 ohms and you have 9mV DC
across them. . .that would be 41 mA. . . it should keep everything
open and working. Don't go over 150 mA is some thought. . . your
amp will just be producing more idle heat. . . I have a Yamaha M-60
service manual and it specifies 10 mV. A good place to start. . .
too little voltage results in too little current to keep your output
devices open. . .thus distortion. The same manual specifies 110 mV
for CLASS A operation. . . That heats the room. . . .keep it warm, but
not hot at idle. . .

Let me know how this works.

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