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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.

Reply to
Robijean
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Reply to
Travis Jordan

Electrolytic capacitors, probably. I'd guess in the power supply, the audio output and the protection circuit.

--
Met vriendelijke groet,

   Maarten Bakker.
Reply to
maarten

Sounds like a weak cap on the relay drive circuit.

Leonard

Reply to
Leonard Caillouet

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

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Reply to
sofie

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        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.
Reply to
Dave Plowman (News)

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