Jubilee lineage

Discussion in 'Marshall Amps' started by Dan myers, Dec 2, 2021.

  1. Dan myers

    Dan myers Member

    Joined:
    Jul 26, 2021
    Messages:
    27
    Likes Received:
    33
    Trying to see if anyone knows if the jubilee is more in line with the jcm 800
    2205 rather then the jcm 2203?I would lean towards the 2205 tone wise
    And layout ie split channel.The 2203 doesn’t sound anything like the jube imo.The 2205 has the same base character as the jube the smooth thick punchy overdrive.What the jube can’t do that the 2203 can is get the glassy tones when you back off the gain which is a plexi trait.Can someone here shed some light on the subject,thanks.
     
  2. Kinkless Tetrode

    Kinkless Tetrode Well-Known Member

    Joined:
    Aug 17, 2017
    Messages:
    1,764
    Likes Received:
    2,625
    The Jubilee is based on the 2203 (of the same lineage of Tweed Bassman> JTM> Plexi>2203) , and has little in common with the 2205 preamp-from examination of the schematic.

    The signal path of the Jubilee is very similar to the high sensitivity-cascaded- signal path of the 2203 but with the LED clip inserted between V1 and V2, taking the place of an additional preamp tube.

    The clean channel signal is just taken from the input gain pot (although there's a negative feedback loop involving V1B) and goes direct to V2.

    Other differences are the tone stack is not a cathode follower but is taken from the plate of V2B. The slope resistor is different and the bass pot is dual gang.

    The 2205 preamp signal path is a different beast with some things in common to post tweed Fenders. I think similarities to Jubilee in tone are more a matter of the amount of gain.
     
  3. Jethro Rocker

    Jethro Rocker Well-Known Member

    Joined:
    Mar 11, 2011
    Messages:
    10,237
    Likes Received:
    15,708
    Location:
    Saskatoon, Canada
    Yep makes total sense to me. Plus the EQ then becomes extremely responsive in a unique way for a Marshall.
     
  4. JacksonCharvelAddict

    JacksonCharvelAddict Well-Known Member

    Joined:
    Mar 4, 2016
    Messages:
    2,213
    Likes Received:
    2,647
    So the LED gain stage is placed similarly to how they modded 2203's back then? Is that how Jose did it?
     
  5. tschrama

    tschrama Well-Known Member

    Joined:
    May 15, 2010
    Messages:
    1,469
    Likes Received:
    763
    Location:
    Netherlands
    The 2555 Jubilee is nothing like a 2203. You are talking about the 2550/2555/2554 Jubilee weren’t you?

    see attached schematic. Iirc is just a jcm800 2205 in a fancy headshell.
     

    Attached Files:

    Dan myers likes this.
  6. Dan myers

    Dan myers Member

    Joined:
    Jul 26, 2021
    Messages:
    27
    Likes Received:
    33
    Yes,the reason I’m asking is I heard a side by side comparison of the jcm 2203,2205&2555 and the 2555&2205 sounded almost exactly the same.
     
  7. tschrama

    tschrama Well-Known Member

    Joined:
    May 15, 2010
    Messages:
    1,469
    Likes Received:
    763
    Location:
    Netherlands
    After a second look, there are many difference between all of them. But the jubilee and 2205 both have the diode clipping and plate fed tonestack.
     
    Dan myers likes this.
  8. Kinkless Tetrode

    Kinkless Tetrode Well-Known Member

    Joined:
    Aug 17, 2017
    Messages:
    1,764
    Likes Received:
    2,625
    The basic architecture of the Jubilee is the same as the 2203: Input> Cascaded V1>V2 (FX loop on Jube between V2A and V2B)> tone stack> master volume> V3 phase inverter>

    The main difference is the LED clip, which is totally different from the James Bond diode clip of the 2205, inserted between V1 and V2.

    Now look at the 2205: Input> V1A> 1st tone stack> clean/dirty signal split> V2A >V1B, or V2B>Diode clip>V3A> 2nd tone stack>V3B>Reverb> V4B>FX loop>V4A> V5 phase inverter.

    The 2205 is nothing at all like the 2203 and 2550.
     
    Jethro Rocker likes this.
  9. Dan myers

    Dan myers Member

    Joined:
    Jul 26, 2021
    Messages:
    27
    Likes Received:
    33
    Got it KT thanks for clearing that up.Appreciate the insight!
     

Share This Page