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Old 29th June 2010, 04:09 PM   #1
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Join Date: Jan 2010
Default headphones output

if an audio amplifier has bad channel output transistor,does the headphones shuld sound only in the good channel output? thanks.
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Old 29th June 2010, 04:16 PM   #2
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Join Date: Oct 2008
Location: England
It depends. If your amplifier has a headphone output that is wired directly to the output stage of the amp with just a resistor to bring down the signal level to that suitable for headphones, then if an output transistor is bad, then this will affect the headphone output too. The headphones should only sound good in the good channel. Even though the headphones may not work in one channel, it might not be an output transistor problem.

An alternative way that headphone sockets are connected is before the main power amplifier input and just after the preamplifier circuitry. This means that a resistor is not needed to drop the signal level.

If the headphone is bad in one channel though, don't immediately take it as a bad output transistor. It could be many things depending on how the socket is wired or whether any different stages of the amplifier (not the output devices) had broken.
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