OP-AMP tweaks

Discussion in 'Effects, Pedals, Strings & Things' started by ROKY, Oct 10, 2005.


  1. ROKY

    ROKY Member

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    Has anybody, here, ever experimented with various op-amp chips
    in their TS-inspired/derived/cloned pedals ?

    David Barber even talks about stacking op-amps on his web site;
    soldering the pins together of two(or more) op amps and then
    plugging them into the chip socket .
     
  2. al carmichael

    al carmichael Member

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    This I gotta hear!
     
  3. ChadM

    ChadM Member

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    Ive stacked 2 op amps, One was the stock jrc and the other was one of the old 808 chips... I got the older one from small bear, But the sound was much better with the op amp stack. Now id just really like to hear it at 18 volts.

    I used the ddss on this song.

    www.myspace.com/austinjamesband

    the song blue. all the leads.
     
  4. David B

    David B Silver Supporting Member

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  5. al carmichael

    al carmichael Member

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    Yeah, buddy! Stack those IC's! I'm gonna try it tonight!
     
  6. subversivepinko

    subversivepinko Member

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    What sort of stack combinations have people had good luck with?
     
  7. basscracker

    basscracker Guest

    would this work with delay BBD IC's,= more time?
     
  8. ROKY

    ROKY Member

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    I have yet to try either swapping or stacking but the stacking
    idea in particular really appeals to me.

    I just got a Menatone Blue Collar w/ the JRC4558 chip as stock,
    and would like to try other chips since it has the socket already
    installed -- I'd like to get even more thickness out of it.

    David Barber sells stacked and soldered **chip cocktails**; I
    might go that route, since my own soldering skills are lacking.

    I like my Red Snapper as is(TL072 chip) but it'd be interesting to
    hear what 2 stacked TL072s would sound like in it !
     
  9. ROKY

    ROKY Member

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    I hadn't thought about that, but I don't see why it wouldn't ..
    of course, I'm far from being a tech head.

    would you also need to add more driver chips ?

    If you're brave you could grab these and a soldering iron and
    have a go at it !

    BBD chip AUCTION
     
  10. al carmichael

    al carmichael Member

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    OK. I did a "chip cocktail" for my modded TS9 tonight, using an OP275GP and an 833TC chip. Its was kind of cool, but the result had a slight high end fizziness that kind of sucked. Each chip by itself has some unique properties--different gains and midrange, etc, but I went back to the stock chip in the end. Fun experiment, but I am sorry to say I did mot find the holy grail with this combination. Thats not to say that another combination of chips would not get closer!
     
  11. ROKY

    ROKY Member

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    Hey Al , thanks for taking the plunge !

    I'm not familiar with those particular chips, though.
    What is the "stock" chip in your modded TS-9 ?

    I haven't done so, yet, but I think I'll probably just get a few
    pre-mixed cocktails from Barber and plug 'em in.
     
  12. imguitardan

    imguitardan Member

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    Is there a site which tells the tonal characteristics of each op amp for a TS style pedal (and maybe even op amp stacks)?

    BTW, will a Rat's LM308 go in where a JRC4558 or similar TS op amp would?
     
  13. Frenster

    Frenster Put your Rock Face on!

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    That looks pretty cool. I'd love to hear more about what kind of tones people are getting.
     
  14. the recluse

    the recluse Member

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    The LM308 is a single op amp, whereas the 4558 is a dual. Even though they have the same number of pins, the pin outs do not match up.
     
  15. Angle Loss

    Angle Loss Supporting Member

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    An LM308 is not a compatible chip with JRC4558 and most others we talk about here. If you would like to hear an audio comparison of 14 chips in a Timmy follow my sig link. It is not a Tube Screamer obviously, but the Timmy is a better pedal to hear opamp differences. The same characteristics will follow into a TS.
     
  16. PremiumPlus

    PremiumPlus Member

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    Should be interesting. You would be getting the best or worst of 2 worlds. I think it would sound thicker because of the difference in signal propagation time through the different opamps. It would also do some things in the loop gain...this is pretty provocative.
     
  17. imguitardan

    imguitardan Member

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    i appreciate being to hear all those chips although they pretty much sounded the same to me. Which do you think was the brightest/clearest? I'm putting it in an older Barber Direct Drive that I'm trying to open up some. THNX
     

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