Need Some Help With New/used Class 5

Discussion in 'Marshall Amps' started by Chris4189, Jul 10, 2018.

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  1. Chris4189

    Chris4189 Well-Known Member

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    Please pardon me if this is a dumb question. This is my first tube amp and my first Marshall.

    Recently I purchased a used Marshall class 5 combo locally. I was drawn by the lower power feature and the tones I was hearing via YouTube. The previous owner replaced the stock tubes with 5751, a 12AY7 - 6072, and a EL84.

    Last night I plugged into the amp for the first time with my Firebird. I had the amp dimed out and used my guitar to control the volume. I could not get any break up or crunch. It was amazingly clear.

    What tubes do I need to get a good crunch/classic rock sound?
     
  2. ricksconnected

    ricksconnected Well-Known Member

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    great first tube amp pick bro.
     
  3. Gunner64

    Gunner64 Well-Known Member Premium Member

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    I had one. Had a weird tone stack where it was super bass heavy, even with the bass on zero it was still flubby, at least with the Stock speaker. Had I kept it I would have modded it a bit for more crunch and less flub.
     
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  4. Gene Ballzz

    Gene Ballzz Well-Known Member

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    Great amps! I have a sorta later head version and it's stock and never going anywhere! Swap out the 5751 and 12AY7/6072 for more the standard, common 12AX7/ECC83 and you'll be back to normal! You can peruse all the hype about different brands and choose what seems like your favorite flavor. The truth is that you have a variety of 12AX7 tubes on hand to see which ones sound different and as spares. Big thing is to get lower noise but full gain characteristics for this amp.

    Oh, and welcome to the forum!

    HNAD,
    Gene
     
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  5. Chris4189

    Chris4189 Well-Known Member

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    one EL84 and two ECC83 tubes, correct?
     
  6. Kutt

    Kutt Well-Known Member

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    Yes. Those 12AY7 and 5751 tubes you have in there now are considered to be lower gain tubes and are probably contributing to the cleaner sound you're getting. You can also get ECC83 / 12AX7 tubes rated with higher gain which will probably make the amp break up even sooner, if you want.

    I have the head version of this amp and recall experimenting with the preamp tubes. I recall putting high gain preamp tubes in both positions but got unwanted squealing. I can't remember which position caused it, but using only 1 high gain preamp tube and the other a "standard" 12AX7 worked well, and that's how I have it today.


    upload_2018-7-10_13-39-20.png
     
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  7. Kutt

    Kutt Well-Known Member

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    Also, I remember that the tubes are mounted in a bracket of some sort and mine was a bit of a bitch to pull them out from. So just be careful and work them out slowly.
     
  8. Chris4189

    Chris4189 Well-Known Member

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    Great!! Thanks so much guys!!
     
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  9. JimiRules

    JimiRules Well-Known Member

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    Hope you get it sounding the way you want. The Class 5 was my first Marshall and a very good amp. I kick myself for selling it.
     
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  10. ken361

    ken361 Well-Known Member

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    I boosted mine with a fryette EF86 tube pedal it was beast! it kept the low end and added dynamics way better then a Tube screamer I might have to get one again I bought a Vox HW and didnt really need another amp:( one of the only amps I heard the speaker break in it was warm and smooth.
     
  11. Clifdawg

    Clifdawg Active Member

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    Change the preamp tubes back to 12AX7/ECC83s, then hit the front end with a boost pedal. :dude: Crunch all day long!
     
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  12. Chris4189

    Chris4189 Well-Known Member

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    New tubes have been ordered and will be here Friday! Thanks so much for the help.

    Has anyone replaced the OEM speaker with a G10?
     
  13. Gene Ballzz

    Gene Ballzz Well-Known Member

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    can't speak for the 10 in these or the cabinet, as I'm kind of a snob about generally only liking closed back speakers. AND I've never heard an open back 10 that floated my boat. On the other hand, the four G10L-35 speakers in my 1965B box sound glorious! At 94db sensitivity, they're kinda like having a "gentle" attenuator, compared to the 98 or 99db greenbacks in my 4x12 1960B boxes!

    And yeah, the bass can be a bit "flubby" but this is easily cured by running through a speaker with a bit more low end to allow you to run the bass pot very low. Typical settings for a Les Paul are Bass = 7:30/9:00, Mid = Dimed, Treble = Dimed and volume between 1:00 and just under Dimed!
    Enjoy Your New Little Rock Machine!
    Gene
     
    Last edited: Jul 10, 2018
  14. pedecamp

    pedecamp Well-Known Member

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    Welcome to the forum! You've heard already replace the preamp tubes with 12AX7 and you'll be good. Report back how it goes! Cheers
     
  15. scott6762

    scott6762 Member

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    I had a Marshall Class 5 combo. I thought it was a great amp. Enjoy your new amp and have some fun ! :cheers:
     
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  16. Chris4189

    Chris4189 Well-Known Member

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    The tubes made a freaking world of difference!! Thanks again guys!!
     
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