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| Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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29th Nov 2022, 3:26 pm
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#1 |
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Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,355
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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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29th Nov 2022, 4:35 pm
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#2 | |
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Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,355
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Re: Marantz PM 350 volts on speakers! both.
Quote:
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29th Nov 2022, 4:56 pm
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#3 |
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Pentode
Join Date: Jan 2013
Location: Kelvedon, Essex, UK.
Posts: 238
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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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29th Nov 2022, 5:55 pm
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#4 |
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Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,355
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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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