Bluesbreaker Circuit in a Fender package

Discussion in 'Building the Classics' started by Dblgun, Nov 29, 2020.

  1. Dblgun

    Dblgun Active Member

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    With all the projects I see everyone working on I was getting jealous! I've been perusing the schematic for a JTM45 circuit with tremolo (Bluesbreaker). I figured I had most of what would be needed to complete something close as long as I used transformers I already had. I really don't need another amp but the Covid-19 thing has the completion of my workshop on hold and I'm bored!

    So I've decided to build an amp I could put into my Tweed Super cabinet which is a 2x10 cabinet. My plan is to use a generic Hammond metal "chassis" similar to a Tweed chassis Fender type power transformers and 20Hy Marshall type choke. Obviously this will not be an exact clone of a Marshall but will be pretty close. On Friday I went down to an electrical supply house and picked up a metal box to make a chassis. The chassis is much smaller than a Marshall chassis, especially with the addition of tremolo. I spent some time yesterday laying out what I think will work. It is certainly going to be very tight, the proverbial 7lbs of sh*t in a 5lb bag!. I'm not sure how it will come out but I'm going to give it a crack.
     

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  2. Dblgun

    Dblgun Active Member

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  3. Timbo

    Timbo Active Member

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    Nice!!!!
     
  4. Dblgun

    Dblgun Active Member

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    Moving along I ran through test fitting transformers, filter caps, etc. tonight. Looks like everthing will fit.. IMG_3788.JPG IMG_3790.JPG IMG_3790.JPG IMG_3792.JPG IMG_3794.JPG
     
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  5. Chris-in-LA

    Chris-in-LA Well-Known Member

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    Are those Weber transformers?
     
  6. thetragichero

    thetragichero Well-Known Member

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    oh these 10lbs in a 5lb sack builds are fun to troubleshoot but lovely when you can pull it off (just finished assembling a very brownface-esque build in a hammond ao-44 chassis with an added 12ax7. gotta get a fuse before firing up)
     
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  7. Dblgun

    Dblgun Active Member

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    Yeah, essentially spare Super/Bandmaster transformers that look to be what I have on hand and best matched to the project. These were supposed to be used in another amp but NOS originals came around. I don't have a whole lot experience with Weber transformers so we'll see how it goes.

    Any photos of your build, I'd like to see what you did..
     
  8. Chris-in-LA

    Chris-in-LA Well-Known Member

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    That PT looks a lot like the one that came with my Super kit from Weber. I had some trouble with mine, funny noises and some other quirks. Mine was made in China and the quality was suspect. I eventually switched it out for a Mercury Magnetics. I hope you have better luck than I did.

    94653337-36AC-45AD-9542-B61D1F4AD76A.jpeg
     
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  9. Dblgun

    Dblgun Active Member

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    Oh, I hope this one is not junk. Good transformers for Super's are kind of hard to come by sometimes. Other than noises what were the other quirks?
     
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  10. thetragichero

    thetragichero Well-Known Member

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    @Dblgun
    not nearly as pretty as turret board construction but it gets the job done in a tiny space while keeping the preamp ground node separate from everything else

    [​IMG]

    [​IMG]
     
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  11. danfrank

    danfrank Well-Known Member

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    Oooo.... BB built into a Tweed style chassis. Nice!

    I got a 2x10 combo Bassman cab in a trade and converted it into a 15" BB/Bassman combo amp. Really great sounding circuit!
     
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  12. Chris-in-LA

    Chris-in-LA Well-Known Member

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    The amp just seemed touchy to me.
     
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  13. Dblgun

    Dblgun Active Member

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    @thetragichero-that is a lot of stuff in a very small space, you win!
     
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  14. yladrd61

    yladrd61 Well-Known Member

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    That should be quite the rowdy beast, what speakers are you going with ?
     
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  15. Dblgun

    Dblgun Active Member

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    The cabinet currently has two 35W blue frame 1028P's which are very nice with the vibrolux. I have and plan to try a pair of 75W Eminence Copperheads also. The project I think will go together fairly quick but shaking it down may take a while! IMG_3766.JPG IMG_3767.JPG
     
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  16. shredless

    shredless Well-Known Member

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    Is that your 55 chevy? Any more pics of that?
     
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  17. Dblgun

    Dblgun Active Member

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    Yes, the 55 is mine. Not sure that pics of it belong here but here's one. 55 a 22.jpg
     
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  18. South Park

    South Park Well-Known Member

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    That straight axle front end is to kool. You can do a lot with those fender circuits if you don’t get nuts with the gain . Good job
     
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  19. shredless

    shredless Well-Known Member

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    150...too cool. You got the 2 lane A/G thing goin on...dig it.

    Its cool, l dont think people round here mind a minor deviation for something cool like this. If you wanna talk about it make a post in the backstage...thanks for the pic!
     
  20. Dblgun

    Dblgun Active Member

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    Thanks folks!

    shredless- Good eye, it is a 150 Utlity sedan. I've had her longer than my wife, and we've been married 30 years this June.

    I've been under the weather the past few days. Once I get caught back up at work I plan to make some more progress on the amp project.
     
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