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  1. DSharp

    Classictone Ot For 2204

    OT still available?
  2. DSharp

    5e3 Power Tube Socket Wiring Question

    My understanding is that at high volume, plate voltage might sag below screen voltage, new production tubes will red plate under such conditions, these screen resistors will help avoiding this.
  3. DSharp

    Marshall Jmp 2144 (1980) - Info

    Thank you JCarno, I will try to record some clips during the weekend, but basically with boost off you get mild crunch and less highs. Photos attached. Kris yes it's black grill. What I meant is that as far as I know JMP 2104 circuit should be the same as the JCM 2104.
  4. DSharp

    Marshall Jmp 2144 (1980) - Info

    For reference in case anyone is interested, I compared a couple of things between the amp and the schematics: 1- Boost OFF adds a 15k resistor and a 0.47cap to V1A cathode's regular 2k7 resistor and 0.68 cap in series to ground. Boost ON shorts them to ground making this stage similar to JMP...
  5. DSharp

    Marshall Jmp 2144 (1980) - Info

    apologies for the double posting.
  6. DSharp

    Marshall Jmp 2144 (1980) - Info

    I recently acquired a rare 2144 combo dating back to 1980. It has the footswitchable boost and spring reverb, with two T1221 blackbacks (1979). I got it from its first owner and it's in a very good condition and little play time. Circuit, caps, transformers and preamp tubes still original and...
  7. DSharp

    Marshall Jmp 2144 (1980) - Info

    I recently acquired a rare 2144 combo dating back to 1980. It has the footswitchable boost and spring reverb, with two T1221 blackbacks (1979). I got it from its first owner and it's in a very good condition and little play time. Circuit, caps, transformers and preamp tubes still original and...

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