UK Vintage Radio Repair and Restoration Discussion Forum - Marantz PM 350 volts on speakers! both.

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- - Marantz PM 350 volts on speakers! both. (https://www.vintage-radio.net/forum/showthread.php?t=196409)

vinrads

29th Nov 2022 4:26 pm

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.

vinrads

29th Nov 2022 5:35 pm

Re: Marantz PM 350 volts on speakers! both.

Quote:

Originally Posted by vinrads (Post 1517431)

Before anyone asks where did you get 350 volts from , I forgot a full stop . Mick.

theredhouseinn

29th Nov 2022 5:56 pm

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.

vinrads

29th Nov 2022 6:55 pm

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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