more gain out of 2nd channel in TR Onyx

Discussion in 'Amps and Cabs' started by hawaiian, May 17, 2005.


  1. hawaiian

    hawaiian Member

    Messages:
    59
    Joined:
    Sep 20, 2004
    need some help on this. i currently have nos rca 12ax7a's in all preamp slots. and either nos sylvania 6l6, or jan phillips 7581a's, that i switch between. i was wondering is there any way to get more gain out of the 2nd channel without messing with the tone that i am getting with the clean channels tone because i really like the way the clean channel sounds. the 2nd channel sounds fantastik too but just want more gain. is this possible?

    also i have the amp biased at 64m. so 32m per tube.

    thanks in advance for any suggestions.

    thanks,
    chris
     
  2. Sherman

    Sherman Member

    Messages:
    625
    Joined:
    Jun 4, 2003
    Location:
    Raleigh, NC
    watupchreese,

    Have you adjusted the internal trimpot yet? There's 2 of them inside. I think it's the lower one. The other pot affects the clean channel. Check w/Joe or Bill to be sure.

    Sherman
     
  3. hawaiian

    hawaiian Member

    Messages:
    59
    Joined:
    Sep 20, 2004
    no i have not played with the internal trimpots i did not even know there was such a thing. thanks for the heads up, and i will give the guys over at two rock to check on that

    once again thanks for the help.

    chris
     
  4. Sherman

    Sherman Member

    Messages:
    625
    Joined:
    Jun 4, 2003
    Location:
    Raleigh, NC
    Chris,

    No problem. Please report back and tell me what Joe/Bill tell you. I can never seem to remember what pot does what.

    TIA,

    Sherm
     
  5. LSchefman

    LSchefman Supporting Member

    Messages:
    13,448
    Joined:
    Jan 4, 2002
    I'd call TR for sure. The amp can get very gainy.
     
  6. hawaiian

    hawaiian Member

    Messages:
    59
    Joined:
    Sep 20, 2004
    update...

    i called the tr guys and spoke to bill and this is what he told me. with the amp chasis out and the front face of the amp facing towards you between the bass and middle knobs is where you will see a board with a blue trimpot on it then there is another board just under that one also with a blue trimpot. these two trimpots are what affects the lead channels amount of gain. from the factory bill said that they set the gain up for a robben ford type of gain. he said that turning the trimpot counter clockwise will increase the gain, he also said that both trim pots need to be rotated so i guess just rotate both counter clockwise until you find the combination that works for you.

    fwiw, i tried increasing the gain and found that i did not like it so i returned the pots back to the stock settings. i did this by marking it with a sharpie pen before screwing around with it. what i found was that although it added more gain it was not the sound that i was looking for, it kind of sounded harsh, whereas the stock settings are more smoother.

    thanks,
    chris
     
  7. LSchefman

    LSchefman Supporting Member

    Messages:
    13,448
    Joined:
    Jan 4, 2002
    Chris, you probably already tried this, but in case you haven't, I found that the setting of the presence control is important to smooth out the higher gain settings, i.e., when you increase the gain, the presence needs to be dialed back a little.

    Another thing you might try is putting in the stock NOS Chinese preamp tubes; you've got some pretty smooth sounding preamp tubes in there.

    Lastly, there's always the tried and true boost or OD pedal route. :)
     
  8. johnrea_77

    johnrea_77 Silver Supporting Member

    Messages:
    907
    Joined:
    Jan 2, 2006
    Location:
    Upstate NY
    I really don't want to mess with my trim pots inside my Onyx because I'm afraid I'd wreck a good thing. One thing I do experiment with is my effects unit and the various levels for headroom and overall transparency when using the effects loop. I make it a point to not damage the base sound at all if possible.

    I think the next month will really tell which effects will be tied into the Onyx for the long run.
     
  9. redplexi

    redplexi Member

    Messages:
    559
    Joined:
    May 10, 2005
    Location:
    Columbus, Ohio
    Strange, I get almost too Much Gain on mine and not enough Clean Headroom. Maybe I need to Try Other Speakers.
     
  10. procos

    procos Supporting Member

    Messages:
    5,215
    Joined:
    Jan 4, 2002
    Location:
    In the Grouse woods or on the golf course
    That and I found that the Onyx's can vary from one to the other. I have owned 4 and each one was different. All sounded good but they did vary from one to another. Especially in the clean channel.

    Chuck
     
  11. scottl

    scottl Member

    Messages:
    17,042
    Joined:
    Apr 11, 2003
    Location:
    Cherry Hill, NJ
    The EH 12ax7 tubes have tons of gain. I bet if you slap them in, you will notice more gain.

    Scott
     
  12. Jack Briggs

    Jack Briggs Member

    Messages:
    1,624
    Joined:
    Aug 14, 2003
    Location:
    Raleigh, NC
    With the 2 TR amps I've owned (Amethyst Special; LTD) I've noticed on both that V1 and V3 (clean preamp and lead preamp) work best with the standard Chinese 12ax7's. I have Boogie SPAX7's in my LTD. The added gain from these gives the amp its characteristic Two Rock touch-sensitivity and responsiveness. NOS 12ax7's will be smoother, but you lose that touch-sensitivity.
     
  13. LSchefman

    LSchefman Supporting Member

    Messages:
    13,448
    Joined:
    Jan 4, 2002
    Just an FYI, the Onyx will overdrive 5881s more easily than big bottle 6L6s. This is especially noticeable on the gain channel, but note that it will also mean that the clean channel will more easily get those elusive "edge of distortion" sounds.

    This change to the clean channel may or may not appeal to you. I like it, but then, I like to push my cleans a little.
     

Share This Page