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Anyone know how Morgan lower the hum of single coil?

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  • #16
    Well, it's no point of dissecting the condition that cannot be replicated. I heard what I heard and I am absolutely convinced that the amp is lower noise with a single coil pickup. All I can say is I am very experienced with noise cancellation design and I did a lot of work on this, and I know about scientific comparison. It will be very very obvious if one amp is louder and the other one is at lower volume. I did so much of these analysis that I am very sensitive to these variations. Anything that is suspicious will raise my attention very fast, but I see no inconsistency at the time.

    But anyway. So all of you consider that my observation is impossible. I also cannot think of any way of doing it. I just want to run it by you guys.


    Noise cancellation technique that we talked about in the other thread using out of phase hum is not possible in this case as you cannot control the player from moving around. You can cancel noise pick up inside the amp as everything is stationary, all you have to do is adjust the gain and phase and you can do it, that's easy. Not in this case. I so wish I can have that amp for one night and dissect it!!!

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    • #17
      maybe got license from Ilitch?
      Espacenet - Bibliographic data
      or just roll off everything above 5kHz?

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      • #18
        Originally posted by tedmich View Post
        maybe got license from Ilitch?
        Espacenet - Bibliographic data
        or just roll off everything above 5kHz?
        I tell you, I gave it a lot of thoughts as I designed the noise cancellation for single coil without changing the sound. This is actually scary to me. That's the reason I am very stubborn but I cannot go any further.

        Ilitich change the sound, I don't even think much about them.

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        • #19
          Just a wild guess - lower amplifier input impedance by using a lower Rg1 (Grid Leak) resistor on the input tube. Something like 220K instead of the usual 1M. The lower impedance shunting the pickup will make them less susceptible to noise pickup.
          Cheesr,
          Ian

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