Marantz Model 18

FM mute works much better now the the trimmer R328 is installed.

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Tony
 
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Voltage at Q605 is off

  • d is -11.8 should be -12
  • g is -3.8 should be 0
  • s is -4.9 should be -1.4
Tony
 
Does any know a good sub for 34-1012 fet in the MPX matrix board.

Tony
 
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Were you able to establish a cross for the JFET? If not I may be able to pull a working example out of an 18 and test it.
 
Tom suggested 2N5460,61 or 62. All I could find was 2N5460. When I get the old ones out I could send you the one that is working.

Tony
 
I was just looking at something and realized there are two different ways to wire the mute adjustment.




18 mute.jpg

Tony
 
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I replaced the speaker relays(R48-5D5-6L). I think I can finally call this one done.

Tony
 
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