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  1. RV59

    Problems restoring Harman Kardon TA-5000X

    What is the value of this resistor on your unit? Mine is 220 Ohms, but It's strange cause normally it's 330 Ohms on the schematic. Also do you get the complete schematic?
  2. RV59

    Marantz Eighteen (18) "pop" sent to speakers when powering off

    there are also 2 capacitors (C4 & C5) in parallel with the switch, to limit the electric arc to the interruption of the device. Make sure they're well connected, and in good condition.
  3. RV59

    Marantz 18 Transistors

    my contribution: Q11, Q14, M 34-1000: 2N3055 Q12, Q13, M 34-1001: MJ2955 Q1, Q2, Q4, Q5, M 34-1014: 2N3568 KSC945C Q3, Q6, M 34-1013: 2N3638 KSA733C Q605: M 34-1012: (fet) 2N5460 Transistors scope: 2SC2611
  4. RV59

    Marantz 18 scope not Working how to check if scope is faulty

    I was sure my system would be useful to others. Glad to see that this is the case. :) I will even advise those who have a Model 18 with a good transformer to make the modification anyway, in advance in order to avoid burning the transformer completely, which are not found.
  5. RV59

    Marantz 18 vs marantz 19 Receiver HELP PLZ!!

    This is exactly what I mind when I said "with a better technical and aesthetic design", and this is why I would not advise a Model 18 to anyone who have no knowledge of electricity or who would not "put their hands in the sludge". Since Model 1 & 2, marantz has always used Spragues...
  6. RV59

    Marantz 18 vs marantz 19 Receiver HELP PLZ!!

    The Model 18 is the only receiver designed by Saul Marantz, Sid Smith and Dick Sequarra. The Model 19 is a copy of the Model 18, designed by Superscope, with a better technical and aesthetic design but the components are significantly less good qualities. Personally I prefer Model 18, but I...
  7. RV59

    Welcome to the world of James B. Lansing

    Thank! Great look. I will use it to make enclosures. (for speakers Altec 416-8A & 802-8D/811 horns).
  8. RV59

    Welcome to the world of James B. Lansing

    What is the right speaker?
  9. RV59

    What is the best sounding Marantz Receiver?

    I've had or still own Model 18, 22, 2225, 2230, 2240, 2245, 2270, 2325. All are excellent receivers. My preference goes to Model 18 (I own 3 now), Model 2245 & 2325 are nice too.
  10. RV59

    Marantz 18 Amp Issue

    which reference did you use instead of Q9?
  11. RV59

    Marantz: Made in USA vs Japan

    What is the Serial Number of your Japanese Model 19?
  12. RV59

    What exactly makes a 2330 better than a 2325?

    How do you know that it's a Sanken or Toshiba transistor?
  13. RV59

    Marantz 18 Amp Issue

    I use 2N3055 (NPN) for Q14, MJ2955 (PNP) for Q13, 2N5195 (PNP) for Q10 and 2N5192 (NPN) for Q9. Work fine. Hope to help.
  14. RV59

    Installation of a replacement transformer for the oscilloscope of the Model 18.

    No, it only takes some technical knowledge. The main difficulties were finding someone to make custom transformers, and what output voltages to choose. What continuous tensions do you get? (-500 & 6.3)
  15. RV59

    Marantz 18 scope fixable??

    18-2018 down, 18-7460 up. Both are clean.
  16. RV59

    Marantz 18 scope fixable??

    Seem that last version have a lighter color than olders versions. I will post pictures of a 18-2018 vs 18-7460 soon.
  17. RV59

    Marantz 18 scope fixable??

    Of course it's fixable, the problem is to know where is the failure.
  18. RV59

    Model 18, 500 volt supply

    Too powerful and too big, in my opinion.
  19. RV59

    Model 18, 500 volt supply

    I hope you'll never have any problems with your installation, but it's a risk I wouldn't take twice, because the main transformer is impossible to find on Ebay or anywhere else. I just opened the thread on the modification I made...
  20. RV59

    Installation of a replacement transformer for the oscilloscope of the Model 18.

    I open this thread for those who have problems with the voltages required to operate the oscilloscope on the marantz Model 18. The defective -500V is a recurrent problem on the transformers of this Model, but if you are lucky that the other voltages are correct, it is possible to add a small...
  21. RV59

    Model 18, 500 volt supply

    If, for any reason, the 6.3V winding is a little grounded in the main transformer, this will result in a short circuit at 500V, and the 6.3V windings won't resist it. That's what happened to me. 6.3V & 325V
  22. RV59

    Model 18, 500 volt supply

    it is important to be very careful with this type of assembly, because you inject 500V into the main transformer via the 6.3V of the filament. I had done the same assembly on a Model 18, and the main transformer ended up burning. Now I use a small transformer with 2 voltages, in order to...
  23. RV59

    Marantz eighteen (18) receiver questions

    To remove this plate, you have to unsolder the stereo light wires. Then you remove the glass. Then remove the small metal plate behind the stereo light with a small screwdriver. Protects the plastic skylight for the scope with a small sheet of paper before painting. I repainted it in satin...
  24. RV59

    Merry Christmas, Marantz forum!

    Merry Christmas to everyone at Audiokarma. :beerchug:
  25. RV59

    HELP a brother out! I need some advice on how to fix my Marantz Model 18 scope.

    I'm sure all the scope cards in Model 18 are the same, and the transistors too.
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