ECC823 has arrived

Discussion in 'The Workbench' started by Peter McAteer, Oct 21, 2019.

  1. Peter McAteer

    Peter McAteer Member

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    The ECC823 I ordered from Eurotubes has arrived, soon be slotted into V1 in my DSL15H. Hopefully this tames the insane red channel on this amp! Updates pending.
     
  2. Jon C

    Jon C Well-Known Member

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    You mean ECC83S ?
     
  3. Peter McAteer

    Peter McAteer Member

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  4. Jon C

    Jon C Well-Known Member

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    Wow …… Darker than an 83 ?
     
  5. Peter McAteer

    Peter McAteer Member

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    Instead of being routed thru a 12AX7, the red channel goes thru a 12AU7. Much less gain...Which in the DSL15, is exactly what is needed. For reasons known to no one but the folks at Marshall, the DSL15 has the Red 2 channel of the DSL40, and not the more useable Red 1. Subbing in an ECC823 is one way of taming the red channel on the DSL15.
     
    Last edited: Oct 21, 2019
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  6. Jon C

    Jon C Well-Known Member

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  7. donwagar

    donwagar New Member

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    I bought a DSL15C about 6 months ago, after I'd read up on some of the mods here.
    I thought the ECC823 was a good mod. I also did C76 (150pF), R82 (added 150K), removed C75.
    And I put a Private Jack speaker in it.
    I think it sounds way better than it did. It's my home practice amp now.
     
  8. Peter McAteer

    Peter McAteer Member

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    You added the ECC823 AND did the R82? That must have tamed the red channel a whole lot. I'm going to start with the tube, and if that doesn't do enough, I'll rebuild the red channel to the same spec as red 1 on the DSL40. Like shown in this vid
     
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  9. South Park

    South Park Well-Known Member

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    I think what you are doing is dropping the q point of the preamp tube. You can look it up on the data sheet. Power curve
     
  10. Peter McAteer

    Peter McAteer Member

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    Well, after a few weeks of being busy with other projects, the ECC823 finally went into the V1 slot today. I must say that this one change has really tamed the red channel. If you're looking for a simple, no-solder mod to dial down the insane red channel on the DSL15, this is it. That being said, it's still a bit fizzy. Further mods may be in store if I can't EQ the fizz out of the signal. C76 AND R82 may be next.
     
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  11. Peter McAteer

    Peter McAteer Member

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    I'd add that the JJ EC823 has improved the green channel as well. Apparently the 12AX7 side of the twin triode is an upgrade to the Marshall branded ECC83 that came with the amp.
     

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