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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 29th Nov 2022, 3:26 pm   #1
vinrads
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Default Marantz PM 350 volts on speakers! both.

This is a bit of a wreck ,filthy inside ,he said don't spend a long time on it ,I guess that means he didn't want to spend much money on it, I have a cct
the o/p transistors read ok ,what looked like 39 ohm was o/c could it be something common to both channels ,any ideas. Mick.

Last edited by vinrads; 29th Nov 2022 at 3:37 pm.
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Old 29th Nov 2022, 4:35 pm   #2
vinrads
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Default Re: Marantz PM 350 volts on speakers! both.

Quote:
Originally Posted by vinrads View Post
This is a bit of a wreck ,filthy inside ,he said don't spend a long time on it ,I guess that means he didn't want to spend much money on it, I have a cct
the o/p transistors read ok ,what looked like 39 ohm was o/c could it be something common to both channels ,any ideas. Mick.
Before anyone asks where did you get 350 volts from , I forgot a full stop . Mick.
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Old 29th Nov 2022, 4:56 pm   #3
theredhouseinn
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Default Re: Marantz PM 350 volts on speakers! both.

Hi Mick.
How did you measure the o/p tr's. Sounds like 1 is o/c and the other is s/c in both channels. might have blown the drivers as well.
John.
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Old 29th Nov 2022, 5:55 pm   #4
vinrads
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Default Re: Marantz PM 350 volts on speakers! both.

Hi John all in circuit read ok ,just found the resistor o/c is a feed to the reg Q 807 , looks like problems there. Mick.
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