Ice picky blues jr?

Discussion in 'Glowing Bottle Tube Amp Forum' started by Strowbri86, Jun 20, 2021.

  1. Strowbri86

    Strowbri86 Tele-Meister

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    I recently got a new Blues Jr IV. I've had a few through the years. After going through a bunch of amps I decided to go back to the old classic as it's always been the most tonally reliable for what I go for.

    Knowing the drill on this amp, I immediately swapped out the speaker for a Cannabis Rex (which I am very familiar with and prefer), the power tubes for JJs and the 12ax7s for russian Electro Harmonix.

    I plug it in to mess around, and holy cow is it ice picky. Like.. 20% more harsh top end than I've ever had with one of these. And especially with the Cannabis.. that's a surprise. I had to turn the treble down to 4 before it wasn't harsh, but then it's lacking all the top end too.

    The only thing I haven't used before is the Russian 12ax7s. But I got those because they -supposedly- affect a good bottom and round top end to the tone.

    Right now I am playing music through the amp to break it in for a while. But I'm really surprised how harsh the top end is. Not sizzly, not chimey, harsh. If I push the fat boost, which I usually love and prefer, it's only worse.

    Before I assume it must be the ehx 12ax7s is there something I might be missing here?
     
  2. Hpilotman

    Hpilotman Tele-Holic

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    I owned one BJ IV for about a year before selling it. Lots of BJ Owners experiment with different speakers. I used an Eminence RED-White-Blues with very good success. I recommend this speaker because it smooths out the highs and also gives Telecasters and Stratocasters nice Low End punch also.
     
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  3. J. Bonkosky

    J. Bonkosky Tele-Holic Silver Supporter

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    Why not try the original speaker and tubes?
     
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  4. Marc Morfei

    Marc Morfei Friend of Leo's Silver Supporter

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    Let the CRex break in.
     
  5. budglo

    budglo Tele-Meister

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    This. Biggest complaint with new amps is icepickiness. Let the speaker break in before changing it imo.
     
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  6. hepular

    hepular Tele-Afflicted

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    how old is it?

    old filter caps can enable ice-pick
     
  7. Milspec

    Milspec Poster Extraordinaire

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    I agree with the suggestion to let the speaker in before you judge. If it is still there, switch to a smooth cone speaker and be happy.
     
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  8. Henry Mars

    Henry Mars Tele-Afflicted

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    It takes at least 20 hrs of hard playing to break in the C, Rex. I use JJ's in my JR .... they sound decent. This amp will benefit by using higher end tubes ... especially the power tubes. When I was using the amp every day it would eat them until I cooled the bias down. These days I find that the C30 is more to my liking.
     
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  9. Strowbri86

    Strowbri86 Tele-Meister

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    I'm just surprised because the two other times I've put in a new CRex there was hardly any harshness at all, and this is pretty extreme. So I was wondering if the 12ax7s can also cause it.
     
  10. Cyberi4n

    Cyberi4n Tele-Meister

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    Speaker not broken in. I know others have said it, but I thought I’d add my one English penny’s worth to the mix, just in case anyone cares what I think :D
     
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  11. superjam144

    superjam144 Tele-Afflicted

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    Just an idea. I dime the bass and 50 cent the treble and mid. Seems to help get a deeper tone. I like a bassy tele tone. Lemme know what happens.
     
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  12. Daytona.57

    Daytona.57 Tele-Meister

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    I add a MXR 10 band EQ on the top of my Pro Jr with a Cannabis Rex in a 1x12 cab and filter the treble and bass to taste, adding mids. This allows more control over the tone.
     
  13. old wrench

    old wrench Friend of Leo's

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    Yes!

    I find that the difference in the cone design - like smooth vs. ribbed makes a huge difference when all the other parameters stay the same.

    I've done some experimenting with Weber speakers where the only difference in speakers is the cone design and there is a very significant difference that even my old worn out ears can appreciate :).

    .
     
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  14. Matthias

    Matthias Friend of Leo's Gold Supporter

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    Maybe a lower pick-up height too, and maybe rolling the tone off the guitar a bit. I find myself tweaking all these things to get the most out of my BJIII.
     
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  15. Bartholomew3

    Bartholomew3 Friend of Leo's

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    I use those with the treble on 1 or 2 with original speaker and the guitar tone rolled-off about 75%.

    Surprising with that speaker you get ice-pick even if not broken in.
     
  16. Andy B

    Andy B Friend of Leo's Silver Supporter

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    A 250pf cap across R3. First stage plate resistor mellows out the treble and fattens up the amp.
     
  17. KC

    KC Friend of Leo's

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    maybe turn the reverb all the way off & see if that improves things? I have an older BJ and the reverb is super-harsh & spiky. I use a pedal if I want more than a whisper of verb.
     
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