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Thursday, September 12, 2019

BK Butler Tube Driver

Apparently it's tube week. Here's the Tube Driver made famous by David Gilmour. It uses a 12AX7 which is pushed by a dual opamp followed by a Fender-style tone stack. I kept the power section from John K's version of the Blue Tube. Fits easily in a 1590BB. Here's the schematic for reference.



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30 comments:

  1. AnonymousSeptember 12, 2019 at 11:54 AM

    One-Two Punch! Very nice!!!

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  2. MiquelSeptember 14, 2019 at 4:32 PM

    Yeahhh!!

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  3. JarvoSeptember 15, 2019 at 4:29 AM

    Is the 10k trimpot for tube bias and if so could you use a 10k pot so it can be adjusted without opening up the pedal for adjustment if so what lugs go where?

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    Replies
    1. Effects LayoutsSeptember 16, 2019 at 9:39 AM

      It is for biasing the tube, you can wire that trimmer as an off-board pot, and lugs 1-2 would go to the V- (brown trace) with lug 3 going to the blue trace/tube pins 3/8.

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    2. JarvoSeptember 21, 2019 at 3:20 PM

      Thankyou much appreciated

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  4. divanorossoSeptember 19, 2019 at 10:29 AM

    Changing all the power supply I think the sound will be different from the Bk. Someone who built it? What are the differences with the original?

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    1. johnkSeptember 27, 2019 at 2:40 AM

      the power supply does not make a difference in the sound. i have three original blue tubes and they sound exactly the same as this one.

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    2. divanorossoOctober 25, 2019 at 4:38 PM

      thank you for assuring me that feeding at 9v ac or 14v dc does not change the sound

      Delete
  5. KGSeptember 19, 2019 at 12:40 PM

    Hi, Thank you for the layout.
    Is there any way to add more output volume ?

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  6. JarvoSeptember 28, 2019 at 5:49 AM

    There appears to be extra holes around the 10k trimpot area on the pcb layout should I remove these before printing as I can't see what they are for?

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    Replies
    1. Effects LayoutsSeptember 28, 2019 at 9:14 AM

      They’re there for trimpots with different pinouts. You don’t have to remove them, just drill whichever holes you need for the trimpot you’re going to use.

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    2. JarvoSeptember 29, 2019 at 6:34 AM

      Thanks again for the reply I thought I'd better ask as I couldn't work out what I'd missed

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  7. JarvoOctober 3, 2019 at 5:52 PM

    One last question the 12ax7 is a nine pin tube but I can only find 8 pin connections on the board, pin 9 or the heater centre tap is not there where should I connect it or is it left unconnected?

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    Replies
    1. johnkOctober 3, 2019 at 6:32 PM

      the center tap is not used (just leave it disconnected).

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    2. JarvoOctober 4, 2019 at 12:43 AM

      Thanks johnk I was going to connect it to ground but i shall leave it unconnected then

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    3. johnkOctober 4, 2019 at 1:27 AM

      no problem. if you look at this gut shot of one of my working builds, you can see that it's not connected:http://johnkvintageguitars.homestead.com/Effects/Bluetube/903B-02.jpg

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    4. JarvoOctober 13, 2019 at 5:01 AM

      Lovely build johnk very neat I like the way you've split the board up to make more room in the enclosure for the tube I've re-laid the circuit out in diptrace but its still quite large I didn't think of splitting it up I might have to try your way (if you don't mind)

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  8. ZZOYDOctober 24, 2019 at 11:09 AM

    verified! It realy working, sound like there: https://www.youtube.com/watch?v=Q00e9xfg2L4.
    I used soviet tube 6н2п, & used dc\dc converter to get 6v from 12 for heater.
    Such Hendrix tunes!!!

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  9. ZZOYDOctober 24, 2019 at 2:09 PM

    have a trouble with whistling LMC7660. how to kill that 10khz whistling, who knows?

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    1. ZZOYDOctober 27, 2019 at 2:53 PM

      i took lmc7660 from my old clone centaur & everything good working without whistling! Chinese chips!!!

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    2. Rocky DeeJune 25, 2020 at 3:36 PM

      Hi, can you double confirm that the lmc7660 works in this circuit? According to the data sheet it has a max supply voltage of 10.5V where the LT1054 has a max of 16V. Considering the 12V supply on this, I would imagine it would be a problem, and the chip would at very best stop working after a short while. I'm just in the process of deciding to build this or not and I only have LMC7660's in my box. I'm just concerned they wont work at that voltage.

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  10. SkeetVanDerchuckNovember 10, 2019 at 9:48 PM

    Is the 47uf cap on the bias trimmer oriented wrong or is it me?

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  11. Sinan AkbabaJanuary 17, 2020 at 2:15 PM


    where is the transfer image?

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  12. MarcelloJune 2, 2020 at 3:29 AM

    Just for confirmation: powered by 12V DC or AC?

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  13. johnkJune 2, 2020 at 5:42 AM

    DC

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  14. geminis martinezJanuary 9, 2022 at 2:33 PM

    howw does it work the pedal wich is the clippping stage i would like to kno all the topology of the pedal plz

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  15. MassatonyAugust 14, 2022 at 7:13 PM

    Turn that 47uf cap near trimpot around and it's verified. Work great.

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    Replies
    1. Effects LayoutsAugust 14, 2022 at 9:02 PM

      Actually, the polarity shown is correct. I know it feels weird having a positive leg go to ground, but remember that brown trace is -V, so that gets the negative leg.

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  16. MassatonyAugust 14, 2022 at 10:20 PM

    It wouldn't work at all until I reoriented that cap..... Once done, it worked rally well. Go figure!

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  17. MassatonyAugust 14, 2022 at 10:25 PM

    I'm going to turn it around again as per schematic and see what happens.

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