TSL 100 mods

Discussion in 'The Workbench' started by Parkerx02, Jul 12, 2020.

  1. Parkerx02

    Parkerx02 New Member

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    I have already upgraded c46, lots of resistors for reliability, and modded the board to prevent bias drift. I have this thing apart at the moment to fix the blown out screw holes at the power tube sockets and to install a choke. Any other must do mods to improve/change sound? The amp isnt overly bright, and would actually like to make the crunch channel have more treble, but dont know how to yet. I have no probs reading schematics but this one is a buggar.
     
  2. tschrama

    tschrama Well-Known Member

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    IMHO the gyrator based depth funtion is tuned way to low on the TSL. Replace it for a classic depth pot. On my website there is a slight voicing mod for the gain channel of a TSL60.
     
  3. Parkerx02

    Parkerx02 New Member

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    I would love to have a pot instead of just the button. Does your website show how to do the depth function mod too?
    jumper R90 1nF
    jumper R92 470K
    clip out C84 (470p)
    jumper R83 1Meg
    Works for the 100 also? Different component numbers I know
     
  4. South Park

    South Park Well-Known Member

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    Look at the tone caps on the crunch Chanel tubes
     
  5. Vesperado

    Vesperado Member

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    Simple fix. Raise one leg on C24 Mainboard. Affects all channels. See if that works for you. Once you have done that you can do the same with C9 Lead and C5 Crunch, having disconnected C24 mainboard FIRST to see whether you need to touch the drive channels.

    FYI I kept C5 connected on my Crunch channel, I also like the treble as is on that channel. Once you have played enough on that amp you will be pulling back the treble to save your ears. Having left C5 as is I still have the treble well below noon on that channel.
     
    Last edited: Jul 13, 2020
  6. Parkerx02

    Parkerx02 New Member

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    c5 and c9 are the bright/treble bleed caps? What does c24 do? Thanks!
     
  7. Vesperado

    Vesperado Member

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    Yes. C24 is "global" as you will notice the clean doesn't have one.
     
  8. em07189

    em07189 Member

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    If you want more treble replace the negative feedback resistor with a higher value, try a 70K resistor.
     
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  9. GIBSON67

    GIBSON67 Well-Known Member

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    Following this thread...
     
  10. Parkerx02

    Parkerx02 New Member

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    Crunch channel tubes?
     
  11. Vesperado

    Vesperado Member

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    V1-2. V3 Reverb/Loop. V4 Phase Splitter.
     
  12. Parkerx02

    Parkerx02 New Member

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    Any ideas how to get more treble just on the crunch channel? I want to boost treble on crunch, and cut treble on lead.
     
  13. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    https://atomiumamps.tumblr.com/post/9124750245/current-complete-mods-to-europa-marshall-tsl-100

    one I'm interested in:
    moreso swapping to the 100k, to see if that makes it more along the lines of the classic tone. I don't necessarily want it to toggle...
     
  14. em07189

    em07189 Member

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    Try replace the tone stack resistor just for the crunch channel.
     
  15. RickyLee

    RickyLee Well-Known Member VIP Member

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    Just wanted to point out that C24 only gets switched in on the CH1 Clean via TR2. I always wondered if it was a mistake and they meant to use a 1uF or so. But they were probably wanting to add some top end sheen to the Clean channel.
     
  16. RickyLee

    RickyLee Well-Known Member VIP Member

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    There are many ways to go about that one. CH2/3 are basically the same topology and voicing but for a few minor differences.

    The main ones are the gain pot values and the inter-stage attenuator/peaker just before the gain pots. The schem shows the Crunch channel peaker as "NOT FITTED", but I thought one of my TSL's might have had that?? I think I did tweak that area on one of my TSL 100's.

    Both channels use all gain stages, where the DSL Crunch channel omits the 2nd stage V1B (V1AA on schem). On the TSL, CH2 Crunch does not use V1B cathode bypass cap C13 1uF, but then that caps gets switched in on the Red CH3.
     
  17. em07189

    em07189 Member

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    What you can also do is piggiback a capacitor of 0.68 or 1uf, across resistor R15 it will give more treble more gain a little more bass in the crunch channel, this change will give you more bass in the channel3, because this capacitor will be in parallel with C13 but not so much because the coupling capacitor of 0.002 uf will filter alot of bass.
     

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