Reverb tank with bag not working

Discussion in 'Tele-Technical' started by holgaguy, Mar 18, 2018.

  1. holgaguy

    holgaguy Tele-Afflicted

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    I just bought a new Accutronics reverb tank for my Vibrolux. It sounds great until I put it into the bag. The bag makes the reverb almost non-existent.

    What gives? Any ideas?
     
  2. holgaguy

    holgaguy Tele-Afflicted

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    Hold on ... just figured it out. No cardboard. Duh.
     
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  3. mherrcat

    mherrcat Tele-Holic

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    Why would the lack of cardboard cause the loss? Bag contacting and dampening the springs?
     
  4. Ira7

    Ira7 Doctor of Teleocity

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    Cardboard?

    A bag or cardboard is only to prevent dust collection.

    Sounds like the wires got loose.
     
  5. holgaguy

    holgaguy Tele-Afflicted

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    Wires were fine - it was the cardboard. It does serve a purpose!
     
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  6. mherrcat

    mherrcat Tele-Holic

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    Well, don't leave us hanging...what is the purpose?

    (Just so I don't have to go pull my reverb tank out and test this for myself...)
     
  7. holgaguy

    holgaguy Tele-Afflicted

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    I think the springs need something solid underneath, hence the cardboard. They worked when I just set the tank into the cab without the bag as well.

    Also, I'm finding vintage corrugated cardboard sounds much better. Any boxes produced before 1968 sound wonderful - the notes really bloom and the sustain is magnificent. ;):lol:
     
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  8. Telegnosis

    Telegnosis Tele-Meister

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    Sounds like the bag muffled the springs.

    If you want classic tank reverb look for Gibbs tanks out of old Hammond organ gear. Hammond made the first verb tank that made it to most amps on the planet but the newer issues have transformers that don't sound as well as the vintage.

    [​IMG]
     
  9. holgaguy

    holgaguy Tele-Afflicted

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    I installed the Accutronics successfully and I think it sounds better than the original.
     
  10. Favata2020

    Favata2020 TDPRI Member

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    My 1980 Vibrolux has me scratching my head,,the reverb works well enough but makes a weird howl when I turn it past 6 or 7, Ive moved the tank around outside the amp and it was fine,I put it back in the bag in the original place and it makes that damn noise..I havent cleaned the rca jacks or wires yet though and the speakers are new jensens c10q Im wondering if those magnets are affecting the reverb afterall..
     
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  11. 24 track

    24 track Doctor of Teleocity Silver Supporter

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    by putting a piece of some thing like card board or thin board under the tank ,nothing can prvent the reverb springs from vibrating I used a piece of acrylic the same siz as the tank and it worked just fine
     
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  12. 24 track

    24 track Doctor of Teleocity Silver Supporter

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    I had the same problem with a fender Jam , it turn out the power transformer was affecting the reverb tank, I even bult a a copper enclosure for the tank as copper is not magnetic and fit it into the bag ,but with tank out of the enclosure the amp sounds great for a small SS amp , I take it yours is Solid state?
     
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  13. Sea Devil

    Sea Devil Tele-Afflicted

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    Reverb tanks can feed back from speaker vibrations, as well as in response the transformer. I have one very lively tank that has foam rubber and a steel plate inside the bag and a rolled-up towel between the tank and the speaker. Without that, it just hits a resonant frequency that creeps in gradually and builds until it doesn't stop.
     
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  14. Favata2020

    Favata2020 TDPRI Member

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    Im trying so damn many things, I changed the driver tube to a 12 ax7 becsue the 12at7 was toast, Im beginning to wonder if thatn was a bad move and also thinking those new Jensen C10Q speakers must be messing things up!
     
  15. moosie

    moosie Doctor of Teleocity Ad Free Member

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    Anyone remember these?


    Screen Shot 2020-06-29 at 01.07.52 AM.png
     
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  16. Sea Devil

    Sea Devil Tele-Afflicted

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    Don't use s 12AX7 in that spot. There's too much gain, and noise will definitely result.
     
  17. tubegeek

    tubegeek Tele-Afflicted

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    Just obtained my first one - type 56 - always wanted one because of the amazing sticker and the reputation for great 'verb. It came with a Sunn Alpha 4 powered mixer, I paid $20 gladly for it. Sounds UGE in the mixer, can't wait to get it set up in a guitar amp.
     
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  18. glenlivet

    glenlivet Tele-Meister

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    For what it's worth..... you could also make a cardboard sandwich with some metal tape in between the "slices" and use that on the bottom of the tank.

    The "tin foil sandwich" will give you a little more RF shielding on the bottom of the tank. The springs in a reverb tank act like pickups if you happen to set your amp on/near anything that is making a lot of RF "noise" ....

    OK..so I know the whole tin foil thing makes me sound crazy...but seriously....it works.



    slice1.png


    slice2.png
     
  19. moosie

    moosie Doctor of Teleocity Ad Free Member

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    As long as you don't make it into a hat...
     
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