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william vogel's Recent Activity

  1. william vogel replied to the thread Amp squeal after mods.

    I usually run same color wires to the grids and I have to check continuity but because you used the later coloring for a Marshall I...

    Oct 26, 2021 at 11:32 PM
  2. william vogel replied to the thread Amp squeal after mods.

    Reverse the orange and green wires at the board.

    Oct 26, 2021 at 12:39 PM
  3. william vogel replied to the thread Amp squeal after mods.

    Your Orange and Green wires feeding the power tubes grids are backwards. The green wire goes to the first side of the phase inverter...

    Oct 26, 2021 at 12:24 AM
  4. william vogel replied to the thread Marshall JMP Master Model 2203 MK2 100watt MODS.

    I just finished a 2204 build. I posted in Building The Classics section here. I agree with everyone here about leaving it original. It’s...

    Oct 24, 2021 at 9:27 PM
  5. william vogel replied to the thread 2204 circuit at lower output build.

    I just played it again. Finally cranked up the master. I cannot imagine having a 2203 100 watt. This little 40 watt amp is so in your...

    Oct 24, 2021 at 9:17 PM
  6. william vogel replied to the thread Marshall JMP Master Model 2203 MK2 100watt MODS.

    What tone/feel are you looking for out of the mod? I can help you but I’m not sure about the mod you are speaking of. Lowering the...

    Oct 24, 2021 at 7:45 PM
  7. william vogel replied to the thread 2204 circuit at lower output build.

    Not to contest with you about the resistors but I haven’t found a schematic that shows the two dropping resistors after the choke on any...

    Oct 24, 2021 at 6:12 PM
  8. william vogel replied to the thread PPIMV - Does It Drop Wattage?.

    Here’s the deal, the PPIMV “should” lower the wattage output of the amp. The reason it’s there is to reduce the output section...

    Oct 24, 2021 at 11:05 AM
  9. william vogel replied to the thread 2204 circuit at lower output build.

    Here’s the voltage chart 9CE6BC48-5AD5-4926-93F5-D5051E7C774A by william vogel posted Oct 24, 2021 at 7:03 AM

    Oct 24, 2021 at 7:03 AM
  10. william vogel added new media 9CE6BC48-5AD5-4926-93F5-D5051E7C774A to Marshall Amps

    9CE6BC48-5AD5-4926-93F5-D5051E7C774A.jpeg Oct 24, 2021 at 7:03 AM
  11. william vogel replied to the thread 2204 circuit at lower output build.

    Just finished wiring it up. Makes 40 watts clean rms, 69 watts full power. This is my first 2204 circuit and first time running this...

    Oct 24, 2021 at 1:44 AM
  12. william vogel added new media 75216DBD-DE04-4DB9-973B-F71DAF8AD770 to Marshall Amps

    75216DBD-DE04-4DB9-973B-F71DAF8AD770.jpeg Oct 24, 2021 at 1:40 AM
  13. william vogel replied to the thread What does the written number on El34's mean?.

    You’ll really need to be more specific like it’s numbered on a TubeDepot label or Apex Matching label fixed to the base of each tube or...

    Oct 22, 2021 at 10:43 PM
  14. william vogel replied to the thread Some year JMPs are reputed to be higher gain than others. Why?.

    I think so, or in 68 but the NFB decreased a couple times later.

    Oct 22, 2021 at 6:34 AM
  15. william vogel replied to the thread Some year JMPs are reputed to be higher gain than others. Why?.

    Bright cap value increase and negative feedback reduction.

    Oct 21, 2021 at 11:32 PM