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A100 sounds gritty. Bad Tube?

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  • #1

    A100 sounds gritty. Bad Tube?

    I have a 1965 A100.

    The tone from the top of the leslie sounds gritty. And not in a good way.

    My preamp levels on the Leslie are set to around 7 or 8 and it sounded GREAT. Now the sound is not desirable.

    I opened the back of the organ and tapped on some tubes and found one of the tubes sounding a little "thumpy" and could hear that thump through the leslie when i tapped it.

    I've included a picture of which tube I'm speaking of. I think is the V1 tube in the preamp section.

    I haven't really noticed a HUGE drop-off in overall volume but rather in tone quality.

    Click image for larger version Name: Tube Bad?.jpg Views: 1 Size: 82.7 KB ID: 615585

    I also have a small sound recording of the grittiness.

    https://www.dropbox.com/s/7rk1ba5b9s...Sound.m4a?dl=0

    Any thoughts on what it could be? I have a call into my organ tech but its Xmas eve. I have a show tonight and was hoping to troubleshoot before curtain.

    thanks for any help!
    Tags: 6sj7, a100, distortion
  • #2
    why don't you suspect the leslie tubes?
    ----------------------------------------------------------------------------------------------------------------
    Restored my Hammond C2 (Ser. 37447, 1950, original 230V/50Hz model, rev. B AO-10 Preamp and ElectroTone PER200 Percussion, this organ was made and exported to Switzerland in 1950. Also restored and using: Leslie 760, Leslie 122, 2 Hammond PR40, 2 Hammond L100.
    Hammond M3 (Ser. 58280).
    www.hammond-restauration.ch

    Comment

    • #3
      Originally posted by freiburg View Post
      why don't you suspect the leslie tubes?
      It very well could be. I just went for the tube that I found that was microphonic.

      I'm guessing it could be the Leslie top horn that's going bad?

      When I hold a key down the distortion has a rhythm to it ... as if it's slightly distorting when the horns turn and hit a specific location. It's definitely rhythmic and I can hear it when the Leslie is miked up and I have my headphones on in studio.

      It seems to get worse when i use the Percussion with the top register...and seems to get worse the higher and louder I go.

      What would be the first thing to start replacing?

      Comment

      • #4
        first thing i would check are the 6550 power tubes of the leslie. next i would hook the organ to another amp to find out whether thid signal is clean or not.
        ----------------------------------------------------------------------------------------------------------------
        Restored my Hammond C2 (Ser. 37447, 1950, original 230V/50Hz model, rev. B AO-10 Preamp and ElectroTone PER200 Percussion, this organ was made and exported to Switzerland in 1950. Also restored and using: Leslie 760, Leslie 122, 2 Hammond PR40, 2 Hammond L100.
        Hammond M3 (Ser. 58280).
        www.hammond-restauration.ch

        Comment

        • #5
          If it’s an A100, do you get this problem through the built in speakers?
          Hammond A100, M102, X5, XB3, XB5, TTR-100,
          Lowrey DSO-1, H25-3, Yamaha E70, RA-100,
          Farfisa Compact Duo MK2, Vox Continental 300,
          Korg BX3 MK1, Leslie 145, 122.

          Comment

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