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JTM50 model 1987 and JTM Superlead model 1959

Discussion in 'Building the Classics' started by Jason deBroux, Sep 19, 2021.

  1. Jason deBroux

    Jason deBroux Member

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    Am I safe in assuming HT means high tension ?
     
  2. yladrd61

    yladrd61 Well-Known Member

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    Also the split cathode 1987 and 1959 were JMP which were the models which were made after the shared cathode JTM50 and JTM100.
     
  3. william vogel

    william vogel Well-Known Member Gold Supporting Member

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    A 100 watt is only 3db louder, I’ll agree with this statement but a 100 watt IS twice as powerful. A 100 watt Marshall or Hiwatt shakes things off the shelves in my shop. I have a 50 watt, a 45/100 and an 18 watt and although the 18 watt is loud the 45/100 (75 watts) kills it. A 100 watt has a fuller bottom end and is squishy. They idle between 465 and 490 volts, sometimes higher, over 500 volts and sag 100 volts at full stride. A 50 watt idles between 420 and 450 volts and sags about 50 volts. They feel a bit different.
     
  4. Spanngitter

    Spanngitter Member

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    There is also 1987/2204 Series out there (mainly with a P SN) where B+ runs only around 380V, you barely get it to 400V by running the Amp in 220V Setting instead of 240V.
    PT is apparenlty Drake, couldn't elaborate if 1202-164 or 324 as the marking on the 3 units I had so far was quite faded...
     

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