Blues Jr. Reverb Quest!

Discussion in 'Amp Tech Center' started by Bob Sushko, Jan 25, 2019.

  1. Bob Sushko

    Bob Sushko TDPRI Member

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    I'm trying to decide if I should pick up a MOD replacement tank for the Accutronics that is in my Blues Jr. Any input would be greatly appreciated! Thanks as always.
     
  2. galaxiex

    galaxiex Tele-Holic

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    What are you trying to achieve?
     
  3. Bob Sushko

    Bob Sushko TDPRI Member

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    What I'm not digging about the Accutronics is this sputtering thing when turned up, not sure how to describe it. But I'd like to have a 'smooth' glassy reverb, the Accu overpowers the note I think.

    How would you describe the difference with the MOD in this respect?
     
  4. galaxiex

    galaxiex Tele-Holic

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    I'm not sure the tank is the problem.

    What version BJ do you have?
     
  5. Bob Sushko

    Bob Sushko TDPRI Member

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    1991 completely BillM modded with a C.Rex speaker, JJ outputs, and NOS Phillips preamps . . . trust me, it ain't the amp. ;)
     
  6. DaphneBlue

    DaphneBlue Tele-Meister

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    Hey there! Can you try a reverb pedal with spring, plate and hall options in your BJ?

    I wanted the same thing a while ago and the solution was found in three steps: 1. I tried an ehx holy grail. 2. I bought a used ehx cathedral. 3. I was delighted by a flint that I bought afterwards.

    I always thought an onboard reverb could do the trick but finally a pedal was the best option.
     
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  7. galaxiex

    galaxiex Tele-Holic

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    So I assume you have seen this....

    http://billmaudio.com/wp/?page_id=34
     
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  8. Bob Sushko

    Bob Sushko TDPRI Member

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    I'm not a fan of putting a reverb into the preamp section first . . . too bad the Bjr doesn't have a FX Loop
     
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  9. Bob Sushko

    Bob Sushko TDPRI Member

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    Yup . . . all done. Just want to hear people's experiences between the Accu and the MOD . . . I know it's a cheap & easy swap, but I'm anal with this stuff . . . :rolleyes:
     
  10. galaxiex

    galaxiex Tele-Holic

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    Ok, well... I have a MOD tank in mine, but I can't really compare,
    cuz my Blues Junior is all hand wired and has tube driven reverb...



    100_2443.jpg

    The pic shows an Accutronics tank but I changed it for the MOD later.

    The Accutronics has the wrong impedance for the tube circuit in this application.

    .
     
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  11. JuneauMike

    JuneauMike Friend of Leo's

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    This was Billm's recommendation regarding reverb tanks (emphasis mine):

    The stock replacement tank is the Accutronics 8EB2C1B. If you like long, surfy reverb and darker reverb tone, the Belton and MOD tanks available from Antique Electronics(www.tubesandmore.com) are functionally similar to the Ruby tank, which was just a relabeled Belton tank. I think the long-decay version, the 8EB3C1B, lasts too long, but that may be a matter of taste. The replacement tanks are all more sensitive than the stock Accutronics tank, so you may want to replace the reverb control with an audio taper (available from my Mod Kits page) to control it better. One combination you definitely don’t want is the long-delay tank with the stock reverb pot. It’s barely usable on 1 or 2.
     
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  12. strat a various

    strat a various Friend of Leo's

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    I hated the Reverb in my Blues Jr, so tucked a thin piece of grey eggcrate foam under the springs in the tank. I need to turn the Reverb knob up just a little higher, but the foam just barely touching the springs gets me a smoother, more usable effect.
     
  13. JuneauMike

    JuneauMike Friend of Leo's

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    Are you saying you muffled the spring action? So you get less reverb? I can't imagine how'd you calibrate something like that. I would think there's be a world of difference between "just barely touching" and all messed up.
     
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  14. jimgchord

    jimgchord Tele-Afflicted

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    Calibrate? When it sounds good, it's calibrated.
     
  15. JuneauMike

    JuneauMike Friend of Leo's

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    LOL. Ah, ok. Good luck with that. Hope the wood screws holding down the reverb tank can take the trial and error process.
     
  16. Bob Sushko

    Bob Sushko TDPRI Member

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    Reverb Quest Update!

    Ok, picked up the MOD replacement tank, here's my report . . .
    The MOD is slightly longer in time, it is somewhat smoother, and had an upper midrange tone, where the Accutronic was louder (much louder than I would use), had a treble ring to the tone and 'boinged' when playing muted notes if ya know what I mean?

    I like the MOD a lot, it stays out of the notes way almost as if there is a tiny pre-delay before it. It's an improvement for sure, I'll see fr sure when I open her up at a gig!
     
  17. JuneauMike

    JuneauMike Friend of Leo's

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    what MOD tank did you get? There are specs on delay time, etc.
     
  18. Bob Sushko

    Bob Sushko TDPRI Member

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    MOD 8EB2C1B Reverb Tank
     
  19. strat a various

    strat a various Friend of Leo's

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    Right. It took two tries. First time, it was too stifled, but second time, it sounds way better than the original stock reverb effect. I can ride the Reverb knob on "4" or even "5" and it's relatively subtle, but very full sounding. Before, I avoided the reverb on that amp entirely. Next time, I'll try felt instead of foam.
     
  20. galaxiex

    galaxiex Tele-Holic

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    Yeah, the foam will probably deteriorate over time.
    What kind did you use?
     
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