Blues Jr IV vs III

Discussion in 'Amps and Cabs' started by DSL74, Jan 31, 2018.


  1. jlagrassa

    jlagrassa Supporting Member

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    The A type speaker in the IV is very good in a BJ
     
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  2. DSL74

    DSL74 Member

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    Thinking about getting a IV. So how do the bass notes hold up in the BJr IV? Seems like on the III they get flabby on lower strings. Assume that is due to the stock speaker more than anything.
     
    Last edited: May 24, 2018
  3. jlagrassa

    jlagrassa Supporting Member

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    Not sure if you use pedals or not but I only run the amp clean and use dirt pedals and the bass is nice and tight. The BJ IV has a bit more Headroom than the III and would say is a little tighter if your using the amps pre-amp gain also the bias is running cooler than all previous models which would help the amp run a bit smother and cleaner.
     
    Last edited: May 24, 2018
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  4. Toby Krebs

    Toby Krebs Member

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    I want one for all these postage stamp size gigs I do.
     
  5. DSL74

    DSL74 Member

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    Thanks, I would use pedals and run it clean, pretty low volumes at home. Curious, if you know off-hand the rating on the power tubes it comes with. Assume they are Groove Tubes like most Fender's.
     
  6. Blues Wail

    Blues Wail Member

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    I have a BJ Laqured Tweed NOS with a Jensen c-12n. It is not a great sounding amp but, it’s fine for bedroom playing
     
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  7. harvey j

    harvey j Member

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    What an amp, Pay $500 or $600 for it, replace all the tubes and speaker and it still sucks.
     
  8. DiPa

    DiPa Silver Supporting Member

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    Lol you get a $600 value amp, you want better, go boutique and pay more...
     
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  9. jlagrassa

    jlagrassa Supporting Member

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    The stock groove tubes are JJ power tubes #5, V1 is also a JJ ECC83S
     
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  10. No457 Snowy

    No457 Snowy Member

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    A good player will make a Bjr sound really good and not suck at all actually.
     
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  11. DSL74

    DSL74 Member

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    Cool, thanks. Is the overall build quality ok? Know cabinet is particle board, but I don't plan on going on tour with it anytime soon.;)
     
  12. '62 Stratmaniac

    '62 Stratmaniac Member

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    I haven't played both, but from watching the YouTube videos comparing the two, it sounds to me like the III is more "Tweedy", with the really forward midrange that tweed amps have, whereas the IV sounds more "Blackface", with a bit more scooped mids type sound.
     
  13. jlagrassa

    jlagrassa Supporting Member

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    I've used the BJ III for a few years and never had an issue so I dont see an Issue with the IV, the knobs are still PCB mounted so long as your careful should still be fine.
     
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  14. DSL74

    DSL74 Member

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    Sounds good, thanks for the demo. How much amp reverb did you use?
     
  15. jlagrassa

    jlagrassa Supporting Member

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    not much at all just enough to to be on, i use short delay time to add some depth but also mixed in very low.
     
  16. DSL74

    DSL74 Member

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    Cool, so how good does the amps reverb sound turned up some? Heard it has been 'improved' over the III.
     
  17. jlagrassa

    jlagrassa Supporting Member

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    I still don't care for the new and improved Reverb, it doesn't over wash your sound like previous versions you have to really crank it for it to get that way it always sounds a little distant. I don't use a lot of reverb so it just barley on for me but still noticeable.
     
  18. framster

    framster Member

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    Liking my BJIV. Perfect size and volume for small to medium gigs I play. Takes pedals very well and exhibits "balanced" tone to my ears. I added Fender feet and amp corners to avoid gouging the bottom edges of the cab when tilting on small stages. Fits so well on my cart so one trip for load-in and out.
     
  19. wiltel24

    wiltel24 Member

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    Anyone know if the bias is as hot on the IV as it is on the BJr III?
     
  20. jlagrassa

    jlagrassa Supporting Member

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    They reduced the bias on the BJrIV, i measured mine at around 31mA they used billm cooler bias mod with a 27k resistor, also increased one of the coupling caps for a little more low end.
     

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