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Headphone Jack for A102

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  • Headphone Jack for A102

    I have an R100 stereo headphone jack and would like to install it in an A102.
    Then I'd like to use the signal for a line level instrument out!
    It is almost identical to the A100 manual figure 29 schematic.
    Instead of a 15 ohm 1/2W off one leg it has a 2200 ohm 1/2W.
    The 'grounds' are both 1500 ohm like figure 29.

    Do I need to install a 15 ohm like figure 29 or will this 2200 ohm still work off one of the G terminals?
    Will the output of the headphone jack drive an ART Tube MP too hard in the middle of it's operating range?
    Thing is,you have to dial these up above 12 o'clock for any audible results?
    A100/251 A100/147 A102/222 B2/142 BV/147 BCV/145 M3/145 M102/145 M111/770 L101/760 T222/HL722 M111/770 no B3/C3!

  • #2
    I use the M3 line out without the speaker load resistor connected to a G/Gnd. I like the capacitor in the circuit to protect the JFETs in the mixer/effect that I'm connecting.

    Click image for larger version

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    Jim

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    • #3
      On an AO28? I guess removing the resistor would work off one G.Figure 29 A100 manual shows a balanced G-G headphones jack in stereo.Your design is unbalanced.
      I want two functions here. Stereo headphones mainly..... I can pad down that signal for a line level out with a DI box.

      Maybe I'll just get a 15 ohm resistor and replace the 2200 ohm to match that A100 schematic. Two amps in an A100. One amp in an M3.
      Might be nice to dial in some 'verb to the phones.
      This assembly already has speaker tabs and 'amp pins' and will loom through an A100 just about right to bring a HP jack out to the front lower rail.
      A100/251 A100/147 A102/222 B2/142 BV/147 BCV/145 M3/145 M102/145 M111/770 L101/760 T222/HL722 M111/770 no B3/C3!

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      • #4
        When you say you want stereo, how do you want the stereo to operate? Reverb in one ear, dry signal in the other?
        Current organs: AV, M-3, A-100
        Current Leslies: 22H, 122, 770

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        • #5
          Mono mix of dry and 'verb is fine with me.
          The R100 assembly was between amps and speakers.Figure 29 of A100 is between preamp(AO28) and headphones/speakers.
          Both have load resistors but I'd like to know if the 2200 Ohm should be changed to 15 ohm like the figure 29 schematics.

          The R100 was on a 15" speaker and the Rotosonic. Black,tan,and red coming off each end.
          The A100 is on the AO28 and the AO44? Or the AO39/AO44?
          The Switchcraft stereo jack is the same on both schematics.
          A100/251 A100/147 A102/222 B2/142 BV/147 BCV/145 M3/145 M102/145 M111/770 L101/760 T222/HL722 M111/770 no B3/C3!

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