northumber82
Member level 3
Hello, I have a trouble in the VAS stage of an amplifier.
The amplifier is powered by +10V _ GND _ -10V. The voltage at the Q5 base should be about 9.2V as simulator said, but it's only about 1.3V.
Measuring under bench power supply, R2 seems to be shorted. And also C1 seems to be shorted, but only in a direction: from the Q5 base to output stage.
The transistor are KSC1845 (Q5) and KSC3503 (Q6). Measuring with the amplifier off, there is no continuity between the pins of the same transistor, so I imagine they are healthy, especially because they have had the same effect since the first power on.
Should the scheme work?
The amplifier is powered by +10V _ GND _ -10V. The voltage at the Q5 base should be about 9.2V as simulator said, but it's only about 1.3V.
Measuring under bench power supply, R2 seems to be shorted. And also C1 seems to be shorted, but only in a direction: from the Q5 base to output stage.
The transistor are KSC1845 (Q5) and KSC3503 (Q6). Measuring with the amplifier off, there is no continuity between the pins of the same transistor, so I imagine they are healthy, especially because they have had the same effect since the first power on.
Should the scheme work?