Jubilee 2555x "Clean" channel with humbuckers

Discussion in 'Marshall Amps' started by Frehley12, Nov 2, 2020.

  1. Frehley12

    Frehley12 Member

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    Rhythm clip NOT pulled. No matter the output of the pickup or whether I use bridge or neck, I get this super compressed or plastic like tone if I dig in just a little. Are diodes present on the "clean" channel too?
     
  2. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    The Jubilees clean channel is normally pretty good. The only problem is balancing the input gain so the clean channel stays clean. I don't think the diodes are active on the clean channel. I can get a good clean with mine even with EMG's.
     
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  3. 67mike

    67mike Well-Known Member

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    Check tubes and bias.
     
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  4. headcrash

    headcrash Well-Known Member

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    I usually have the input gain on 6 or 7 with medium output pickups (Dimarzio Custom EvH on Axis (Super) Sport guitars). On the bridge position it gets slightly gritty if I dig hard. Not so with the neck humbuckers.
     
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  5. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    This is a good recommendation since so many of the 2555x were shipped with the bias set wrong. I am also wondering if the issues the OP is describing is related to a pre-amp tube.
     
  6. Frehley12

    Frehley12 Member

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    It's the digging in that gives me that plastic clipping that is unnatural. More so on bridge. I'm using Slash Alnico set in one guitar and Duncan Distortion bridge, 59 neck on another.

    The lead channel is awesome. Just struggling with the clean when digging in at times. Scratching my head. The breakup just seems fake plastic like quashed.
     
  7. Frehley12

    Frehley12 Member

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    I have biased with stock power tubes. They are around 33-34 per side if I recall. I'm using Chinese 12ax7s with square getters.

    I guess I can put in original Marshall 12ax7s and see.

    I have GT-EL34Ms on the way. Those sounded awesome in my friends original Jubilee. But that was way back about 6-7 years ago.

    I could try guitar direct into amp also and see.
     
  8. Frehley12

    Frehley12 Member

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    My input gain varies from 4-7 if that matters.
     
    Last edited: Nov 3, 2020
  9. Jubilee23

    Jubilee23 Active Member

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    I’d try some good pre amp tubes , my jubilee sounds incredible on both channels, old glass is usually the best way to go in any good amp I find
     
  10. 67mike

    67mike Well-Known Member

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    Use the recommendations printed on the sticker on chasis for bias. 75 to 78 mv per side (pair) is what i recall from a fee years ago.

    Something is fucky with your tubes....probably the shit preamp tubes.
     
  11. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    Can you get a good clean on the lead channel by dialing back your volume?
     
  12. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    The amp should be biased at 70 per side. Some people run them a little higher.
     
  13. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

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    The sticker recommends 70 per side. The range it lists for "safety" is 60-80 but 70 is recommended.
     
  14. Frehley12

    Frehley12 Member

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    In my previous post, 33-34 per tube. 66-68 per side. I checked my bias. 68 per side. According to the sticker Marshall says 60 min, recommends 70, max 80.

    I'll bump it up and see what happens.
     
  15. 67mike

    67mike Well-Known Member

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    75 to 78 is where i run my 2555x and jcm 2000 dsl....respectively. They both kick ass, take numbers, and have their way with your Sisters!
     
  16. Frehley12

    Frehley12 Member

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    I bumped it up to 76 per side. There's an improvement. My bias must have drifted down from last year or my EL34s are going sour. Good timing as I have new tubes on the way.
     
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  17. El Gringo

    El Gringo Well-Known Member

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    See that is what it is all about -best post of the day :headbanger:
     
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  18. Frehley12

    Frehley12 Member

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    Well I came back here to say it wasn't the bias/tubes nor the amp that was causing the clipping on the clean channel. In fact it was a Talisman reverb pedal that did not like a Boss DD-7 in front of it. The DD-7 caused the Talisman to clip if you digged into the strings.

    Btw...I did get new power tubes. GT EL34Ms. Rated 4. These tubes sound exceptional just like they did in my friends original Jubilee!
     
  19. ken361

    ken361 Well-Known Member

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    Pushed cleans with single coils work good
     
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  20. Jethro Rocker

    Jethro Rocker Well-Known Member Silver Supporting Member

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    This is again a very good example of unplug EVERYTHING from the amp when testing issues, in terms of figuring out if it is indeed an amp problem. It seems to happen so often.
    Yes, amp needs to work with the fx you want in it but at least to determine if it is an amp issue. I often mistakenly assume that people with amp problems have already done so.
    Glad it is working the Jube will dig in a bit on clean with gain at 7.
     
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