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Sony Audio amplifier takes long to "warm up"
I have a background in electronics but not in audio amplifier.
I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. On what stage, from the power supply to the audio output, I should look at? What type of component I should look for ( capacitor, relay, transistor)? Do you have a suggestion of a web site? The purpose of this posting is to understand how an audio amplifier works to repair it. |
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Sounds like a weak cap on the relay drive circuit.
Leonard wrote in message oups.com... I have a background in electronics but not in audio amplifier. I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. On what stage, from the power supply to the audio output, I should look at? What type of component I should look for ( capacitor, relay, transistor)? Do you have a suggestion of a web site? The purpose of this posting is to understand how an audio amplifier works to repair it. |
a good possibility.... or just as likely: cold, cracked or otherwise faulty
solder connections on pcb near and around the high heat producing power resistors, semiconductors, etc. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Leonard Caillouet" wrote in message .. . Sounds like a weak cap on the relay drive circuit. Leonard wrote in message oups.com... I have a background in electronics but not in audio amplifier. I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. On what stage, from the power supply to the audio output, I should look at? What type of component I should look for ( capacitor, relay, transistor)? Do you have a suggestion of a web site? The purpose of this posting is to understand how an audio amplifier works to repair it. |
In article .com,
wrote: I have a background in electronics but not in audio amplifier. I have a Sony Audio amplifier, a 25 years old model. I turn on the power and it takes 20 to 40 minutes to hear the music. Just before I hear the music, There is a ZZZZZZZZZZZZZ then a CLICK. Each selection (Tuner, Aux or Tape) works or does not. Once the amp works, it works until I turn it off. Sounds like the speakers are fed via a relay - commonly to prevent a thump in the speakers at power up time. There will be a timing circuit associated with it. May be even they trip out if there's a large DC offset through the amp. -- *You can't teach an old mouse new clicks * Dave Plowman London SW To e-mail, change noise into sound. |
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