Silver Jubilee mods & upgrades

Discussion in 'Amps and Cabs' started by JZG, Jul 29, 2006.

  1. JZG

    JZG Member

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    I just dropped off my Silver Jubilee for a checkup. I was wondering if anyone has some suggestions of modifications or upgrades that could further enhance this amps great tone.
     
  2. Jube2550

    Jube2550 Member

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    Don't mod it. Just get some good chinese preamp tubes which were stock as I find they work best with mine or you can experiment with NOS Mullards or Telefunken. So far as power amp tubes, again you should to go stock with Siemens or unlabelled RFT german plant (same as siemens) replacements. With this stock configuration I am able to get the nice fat sustaining lead tones that Slash had on Appetite. You could try a 12AY7 in V1 for less gain and more headroom which really softens the amp and makes it a bit more vintage for blues. My best suggestion is if you have a 4 x 12 get 2 Greenbacks and 2 G12H anniversary or one of each if a 2 x12 configuration. These, by far, are the best with my Jubilee head and the G12H sensitivity really make the 50 watts sound punchy and fatter like 100 watts due to the increased sensitivity, the greenback just sit back with some added warmth.
     
  3. joolzriff

    joolzriff Member

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    i have a jubilee that has svet winged C 6550's in it and for me that hits the spot for my style,the EL34 jubilee's i have rarely get used or they are a slave amp for my 6550 jube...
    also i have EH12AX7's in it and i like them totaly and they are inexpensive..
     
  4. djem

    djem Member

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    I also have a SJ.

    DO NOT MOD THE AMP !! :nono

    Probably one of the last collectable near-vintage amps Marshall has produced.

    As the other posts mentioned, play around with tube selections, but DO NOT MOD THIS AMP !! :nono
     
    big mike likes this.
  5. Jube2550

    Jube2550 Member

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    What type of music are you playing with all that headroom from the 6550s? The Jubilee plate voltage is only 450-460 v. 6550s can handle 500v or more so isn't the tone a bit cold? I guess the question is how does it sound? What type of speakers are you running?
     
  6. DualRectifier

    DualRectifier Silver Supporting Member

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    History will prove the Silver Jubilee to be a very collectible piece....please, no irreversible mods....do your part to preserve history
     
  7. joolzriff

    joolzriff Member

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    i like the sound of those 6550's....i found the EL34's tooo midrange beam sound,i like to add more midrange to the 6550's with the mid control.
    the sound has more low end control,rounder not flubby when pushed,highs are crisper/tighter......i can use my volume control to control clean and dirt FAR better than with a EL34.
    I am using a standard GT75 loaded marshall that i didnt care too much for with the EL34's but with the largertubes it matches just perfect(all fine tuning for me) just a great great combination.
    for my taste i find a el34 better with a NON master amplifier than a higain master volume....
    i play 2 gigs with it,one is a classic rock outfit and they other is a metal outfit(not nu metal)very nuetral sound marshalls have,they fit in with what ever music,soft rock to super metal,it all depends on your style and it will deliver.
     
  8. Jube2550

    Jube2550 Member

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    + 1. Although the jubes can be quirky, when dialed in right (which you may wind up constantly doing in order to adjust your ears properly to the diode preamp especially after playing any other amp) and played on the right day when the planets and moons are aligned it is right up there with some of the best tones recorded. If Slash didn't get the tone he got out of his then it might have been completely overshadowed and overlooked by the forthcoming hideous and newly released JCM 900.
     
  9. Troubleman

    Troubleman Silver Supporting Member

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    Dude - what he said.
    I still have mine; it's in stupid-clean condition (plastic still on the metal plates) and she shall not be "adulterated"....

    jb
     
  10. JZG

    JZG Member

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    Point taken! I didn't have any plans to make wholesale changes to the amp. I was thinking along the line of subtle upgrades, like Sozo caps or FREDS. Like Jube, I currently have a NOS Mullard in V1, with Chinese tubes in V2 and V3. For power tubes, it's loaded with Boogie-labled 6CA7's. That may change if it's in need of new tubes. I didn't think of the 6550's. Got me thinking about an 82 JCM800 2 x12 that I used to have that was loaded with 6550's. That might have been the best sounding amp I've ever owned.
     
  11. Ironman

    Ironman Member

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    There is a reason the Jubilee is considered by many owners to be the best MV Marshall ever. I wouldn't mess with that. To echo the other guys, experiment with tubes/cabs/speakers, they can make a world of difference sometimes.

    I dial in my 2555 for strictly the fattest and ballsiest classic/hard rock tones it can produce. The tubes that have helped the amp achieve this the best were Ei gold 12ax7's and Ruby/Shuguang EL34BSTR's. Some of the other tubes I've tried sounded nice but this combo makes my Jubilee the beefiest beasty. Also, I'm using it in a wet/dry setup with Wizard speakers, which is another step in getting a huge wall of sound for me. :AOK
     
  12. clothwiring

    clothwiring Supporting Member

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    I run EHs all the way through the amp, does the job just right for me.
     
  13. Miles Long

    Miles Long Member

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    What model was the combo?
     
  14. JZG

    JZG Member

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    I don't recall the exact model number. I owned the amp somewhere around 96 or 97. It was a 2 x 12, with the aforementioned 6550's, and a pair of 65 watt Rola Celestion speakers. Greenbacks if I recall. For me, that was just the blues/rock tone. I used to run a RI Tube Screamer in front of it for leads. I ended up selling it because you had to turn it up pretty loud to getting going, which was too loud for most playing situations, and it was a real heavy beast. I still remember it pretty fondly, even though I only owned it for a short time.
     
  15. dpgreek

    dpgreek Supporting Member

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    Thread revival. I put an EHX 12AY7 in V1 to get some cleaner cleans from my mini jube combo. Works pretty good but wondering if putting a 12AU7 there might allow me to get inout gain up to past noon and stay fairly clean. I dont use rhythm clip and try to keep it as a two channel clean/dirty set up. I worry that this might kill the feel of the lead channel though by lowering gain so much. Anyone ever try this?
     
  16. sickboy79

    sickboy79 Member

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    Try it but, a 12AU7 will definitely effect you dirty tone.
     
  17. hitchcaster

    hitchcaster Member

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    if you send it to voodoo amps for bonnamassa specs... they put in a mercury OT... change the caps to yellow tube IC caps... and this one small mod w/ change in one caps value, i forget.
     
  18. dpgreek

    dpgreek Supporting Member

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    Tried 12AU7. No dice. Lowered clean a lot but affected dirt.

    So after my findings for cleanest sounds with tube swaps in V1 are below. Anytime you push master volume past 1-2 you def get the tube break up.

    Stock tube: full blast, gotta keep master lower around 10 -11 o clock and input gain lower around 9-10

    12AT7: little bit lower gain, can push master to about 11-noon and input gain around 9-10 oclock

    12AY7: master at noon - 1 o clock, input gain around 10-11. Worked best for me but still not there

    12AU7: master at 1 o clock, input gain at 11-1 but lowers lead mast a lot to where its a mild crunch.
     
    Last edited by a moderator: Aug 12, 2018
  19. zombiwoof

    zombiwoof Supporting Member

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    For gain positions, like V1, a 5751 is a better choice than a 12AT7, which is a tube designed for driver positions. 5751 has similar gain, but better tone than a 12AT7 in V1.
    Al
     
  20. louis

    louis Supporting Member

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    Have you tried KT77’s !?
    Tried them in a JCM900 DR and made the amp sound fatter !!
     

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