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Tech 21 Vt bass deluxe issue/question

Discussion in 'Effects [BG]' started by Heath_eld, Jan 16, 2013.

  1. Hey there,

    I recently brought a tech 21 vt bass deluxe and am initially very impressed. However I have an issue or question.

    The manual describes the level control as just adjusting the overall output level. However I find on mine that when I turn it past about 12.00 the sound starts to distort. Like a real tube amp yes - but this is Different to what my bass driver DI does. By the time you turn it up all the way it is quite dirty.

    Is it supposed to do this?
  2. JimmyM


    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    That all depends on what the rest of your settings are. However, when I'm doing just a basic clean sound with no drive or boosted-past-12:00 character settings, it won't overdrive.
  3. Are you overdriving the input of your amp? Making the distortion happen inside the amp rather than in the Sansamp pedal?
  4. tech21nyc

    tech21nyc Commercial User

    Aug 17, 2010
    Manufacturer: Tech 21
    The level control shouldn't create distortion. It's possible that if your EQ settings are too high you could possibly overload the dig-pots.

    If using the 1/4" output you should engage the boost switch if you find you have to turn the level control very high. There are no hard and fast rules as it all depends what you are plugging the pedal into. A mixer, front end of an amp, power amp etc.

    Gain structuring is a very important step when using various units together. You will experience noise or possible unwanted distortion if not done properly.
  5. I tried all the variables - I was running it into a mixer and using my shure iems - and it was an actual sound - that is the unit was putting out a distorted sound - had all the other settings as they came in the manual... I tried engaging and disengaging the boost switch - that did what it should do, either increased or decreased the volume.

    Thanks guys
  6. Ok - I've had a fair bit of email help from tech 21 - very helpful - looks like there might be an issue so I'm gonna head back to the store today and try out whether the standard vt does this (unfortunately they don't carry the deluxe in store)
  7. tech21nyc

    tech21nyc Commercial User

    Aug 17, 2010
    Manufacturer: Tech 21
    The settings in the manual are just to get you into the ballpark of a sound and will not always correlate with your bass, playing style etc.It would be helpful to know some specific settings. You have a number of variables. First the mixer. Which mixer? When going to the mixer are you using a line or 1/4" input or a mic XLR input. If going to a mic input is the mixers trim set properly. Are the IEM's being run with the mixers headphone output, into a headphone distribution unit or something like the Avion system?

    The reason I ask all this is that many times when someone has an issue with our product it can come down to a number of factors. It's helpful to have an understanding of each piece of gear to make it all work optimally.

    Is it possible to just try the VT Bass Deluxe into an amp with just your bass and nothing else?
  8. Hey,

    I've tried both the xlr and 1/4 inch - and also with a bass amp. It is less obvious with the bass amp - because you don't hear the high frequencies as well, but it's very much there.

    Settings are about 9-10 o clock drive, 9.00 character, bass and miss about 12.30 and highs about 12. Starts to clip when you take the volume past 1.00. Iems were plugged straight into the desk. I did an A B with my bass driver and all sounded fine.

    I've tried a couple of basses - a 5 string stingray and a Mexican P.
  9. alec


    Feb 13, 2000
    Perth, Australia
    I can max out the volume of my VTD with no distortion if the drive is kept low.
  10. Growly Lytes

    Growly Lytes

    Dec 4, 2009
    Downunder Oz
    Bass player
    Hot basses send hot signals.Could be your overdriving the amp input or the settings arent properly set on the Sansamp.
  11. I guess what I'm really getting at is "should the level affect the amount of distortion at all".

    I'd say I'm clipping the output on the VTD - I guess I'm wondering whether that is supposed to be possible.
  12. Yes, depending on all other variables.
  13. Hey again,

    Alright - So i took this thing into the shop and the problem was not obvious through a real bass amp in the shop. However i took it back home and it continued through my mixer - In ears.

    Then the real issue for me - i took it down and plugged it into my real rig - so VT deluxe into a power amp driving an SWR Henry the 8x8. I will add - at lower volumes, it sounded hot - room shaking and exactly what i'm looking for (please understand - i am not dissing this product!). But it didnt drive the power amp to its full. And in the same way as with the mixer and IEMs,, when i went past approximately 1-2.00 on the level dial, it just broke up into a clipping sound that with that setup simply didnt sound usable.

    So to be clear - if i set this thing up so that its sound is fat and clean, should the level control affect that sound in any way?

    I seem to be getting told that it shouldnt - but not everyone agrees :)


  14. tech21nyc

    tech21nyc Commercial User

    Aug 17, 2010
    Manufacturer: Tech 21
    It is possible that you could be clipping the digi pots but I can't say for certain without being able to test that actual pedal. You should not have to run the VT Bass Deluxe at full level into a mixer channel. Your mixer can easily be driven with the average microphone. Microphone level is considered -30dB. Which mixer are you using and where are the input trims set at?

    As for your power amp do you have the input gains turned all the way up? Which power amp and do you know the input sensitivity for the amp?

    I'm not ruling out that something could be wrong but it sounds like a gain staging issue. Do you still have the Bass Driver pedal? The output should be similar but the Bass Driver has the "blend" function and that could possibly be why that seems cleaner depending upon the way it is set.

    Even though the VT Bass Deluxe has more than ample output you should not have to run it full out. It's not an amplifier. If you have to turn it full up either the system is under powered or something is set incorrectly.