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Gibson GA8 vs GA9

Discussion in 'Shock Brother's DIY Amps' started by Mongo Park, Apr 7, 2018.

  1. Mexi-Tele Blues

    Mexi-Tele Blues Tele-Meister

    Age:
    40
    167
    Mar 7, 2018
    Westminster, CO
    You're welcome. I plan to keep an eye on your build, hopefully I'll learn something.
     
  2. Mongo Park

    Mongo Park Tele-Holic

    598
    Nov 28, 2010
    Winnipeg
    Iron has already arrived and I have a sheet I will try to bend into shape. As in the correct shape. That is one monsterly big OP transformer, should really put out. I am still collecting parts so it will be slow. I will start a new thread once I get going.
    Cheers Ron. IMG_0149.JPG IMG_0151.JPG
     
  3. Mongo Park

    Mongo Park Tele-Holic

    598
    Nov 28, 2010
    Winnipeg
    I want to revive this thread to thank Mexi-Tele Blues for sharing his point to point schematic with me for this build.
    It has been a few months but is now lives.
    I bent up a Chassie of aluminum and painted it hammered copper colour for some reason this seemed a Gibson like colour. I also made it to sit in the bottom of the cab like a early Gibson. It took a bit of messing with to have it fit in the cab and not have any parts hit the speaker magnet. I was going to use a Canibus Rex speaker.
     
    Last edited: Feb 10, 2019 at 4:13 PM
  4. Mongo Park

    Mongo Park Tele-Holic

    598
    Nov 28, 2010
    Winnipeg
    Here is what it looks like. I have 4,8,&16 ohm outputs which I stills have to connect, running 8 home now. I added a negative feedback switch to cut it, which was the only mod so far.
    I have killer iron from Matt at musical power supply, world class products he has for sure. 33k output transformer for the parallel 6v6’s.
    I am running some “Russian” powere tubes I imagine these thing coming from tank and now happily powering the blues.
     

    Attached Files:

  5. Mongo Park

    Mongo Park Tele-Holic

    598
    Nov 28, 2010
    Winnipeg
    The inside is point to point which I am happy to see more builds like this on the forum. I sort of started out this way and have continued on.
    Lots of space to get it all in and not to rats nest looking. I did the heaters up high so they could drop down from above the tube, worked well no hum.
     

    Attached Files:

  6. Mongo Park

    Mongo Park Tele-Holic

    598
    Nov 28, 2010
    Winnipeg
    I am wanting to separate the shared cathode resistor/cap. I thought I could bias them separately, but now wondering if I could put in a 6V6 and a 6L6 tube. I have read about switching 6V6 to 6L6 but nothing about one of each. I have the current to run the 6L6 and the output transformer is built to handle it but it is 33k and I don’t know how that will come into play.
    Any input would be appreciated.
     
  7. Mexi-Tele Blues

    Mexi-Tele Blues Tele-Meister

    Age:
    40
    167
    Mar 7, 2018
    Westminster, CO
    Looks fantastic Mongo, congrats.

    Am I correct in assuming that the 6V6's bias resistor would bias a 6L6 on the cold side?
     
  8. Mongo Park

    Mongo Park Tele-Holic

    598
    Nov 28, 2010
    Winnipeg
    If i seperate them the cathode resistor for the 6V6 would be 470 ohms.
    6L6 I am thinking around 250-350 ohms, just as you said, but it also involves the plate voltage and output transformer impedance.
    For my limited knowledge more reading is needed, maybe stare a new thread.
    Cheers Ron
     
  9. Nickfl

    Nickfl Tele-Afflicted

    May 24, 2016
    Florida
    I like that you painted the transformer end bells too, thats some nice attention to detail!
     
  10. bigguy12321

    bigguy12321 Tele-Meister

    342
    Jul 13, 2012
    Traverse City Mi.
    Mongo

    Not sure if you have seen this one but here is Magnatone's version of parallel 6v6's.

    May be good for future mods.

    Amp looks great by the way. I really dig point-to-point and yours is very clean.


    magnatone_109-melodier_sch.pdf_1.png

    a
     
  11. Wally

    Wally Telefied Ad Free Member

    Mar 17, 2003
    Lubbock, TX
    Kudos, Mongo.
     
    Last edited: Feb 11, 2019 at 1:01 PM
  12. FenderLover

    FenderLover Friend of Leo's

    Jun 11, 2009
    Minnesota
    Look close at the output transformer - the 6V6's are configured for self-splitting and the output is P-P.
     
    Wally likes this.
  13. bigguy12321

    bigguy12321 Tele-Meister

    342
    Jul 13, 2012
    Traverse City Mi.
    Oops. I should slow down at 1:30am... Thought I saw something I didn't.

    a
     
    Wally likes this.
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