Hi everyone,
I am working on a Plinius Odeon 6 channel amplifier. Not much wrong with it, but I replaced some caps (20 years old) and decided to check the bias current.
The manual says
1.
I am assuming the green 5W resistors next to each transistor is the emitter resistor. When I measure that, every one has a slightly different value.
For example on 1 channel one of them is 54mV and the others are more like 40mV.
My question is
Thanks
I am working on a Plinius Odeon 6 channel amplifier. Not much wrong with it, but I replaced some caps (20 years old) and decided to check the bias current.
The manual says
1.
Code:
[1] Check the right DC servo is set within its operating window. Use VR2 to set TP5 to within –3.0 to +3.0 volts. [2] Check the bias current is correct once the amplifier has warmed up, typically 15 minutes. Use VR1 to adjust the rail current to 140mA or 52.5mV across any emitter resistor (35mA per device).
For example on 1 channel one of them is 54mV and the others are more like 40mV.
My question is
- Am I measuring it wrong? Or
- Is this normal? Or
- Is my multimeter just no good? Or
- They should all be the same and that it's a sign there is a fault somewhere?
Thanks
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