Nad....57 champ clone..

Discussion in 'Other Amps' started by johan.b, Jun 12, 2019.

  1. johan.b

    johan.b Well-Known Member

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    I don't really like these, but I always wanted one anyway. Even thought many times about buying a kit and build one.... so a ready built kit clone came up locally at roughly half the price of a kit, so why not.
    What I don't like about them is the way they break up, but I think I have a simple solution for it.. sadly over sprayed in black, but it doesn't look too bad. Can't wait to get home and play now..
    Pics coming later..
    J
     
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  2. Micky

    Micky Well-Known Member VIP Member

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    I love mine...
     
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  3. Im247frogs

    Im247frogs Active Member

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    I just got a 70's Vibro Champ, almost totally original. I'm having fun going thru it and replacing some drifted components. planning on doing a tone stack lift and a couple other things. I really don't dare even flip the power switch on my plexi in the new building I'm in. Wankers.
     
  4. johan.b

    johan.b Well-Known Member

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  5. Im247frogs

    Im247frogs Active Member

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    Yeah, I just posted this so the guys on the Telecaster forum could help me diagnose the buzzing. It seems everyone has a "dead quiet" Champ except me :(


     
  6. johan.b

    johan.b Well-Known Member

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    Modern preamp tube and offset heater wiring... if you got one. Pop a nos tube in the first socket and try again..
    J
     
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  7. Im247frogs

    Im247frogs Active Member

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    Yep, I'm planning on rewiring the heaters w a virtual center tap. The V1 socket and tube were noisy, so I rolled the few Marshall-branded ecc83's I pulled from my plexi until I found a relatively decent one. Far from a known good tube tho. It's better but its still noisy enough that I have to dig a big further.
     
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  8. Micky

    Micky Well-Known Member VIP Member

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    Put up some gut shots if you can!
     
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  9. netlocal

    netlocal Active Member

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    Two Champs daisy chained, dimed, with a Tube Screamer = Fun city.:hbang:

    Rocked many a dive bar this way. And some bigger shows too. On the big stages sound guys don't get all over your ass for being too loud. They don't take up too much room in the truck either. I love these amps.
    IMG_1205[1722].jpg
     
    Last edited: Jun 12, 2019
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  10. johan.b

    johan.b Well-Known Member

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  11. Im247frogs

    Im247frogs Active Member

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  12. johan.b

    johan.b Well-Known Member

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    Speaker plug needs replacing. Not solid and giving crackling sound at high volume( mentioned above)
    And the speaker is 8 Ohm. Should be 4 Ohm.. no biggie, but loses a few watts there...

    .. and I believe, what I don't like about single end circuits when clipping is the wiggle at the cathode in an unbalanced circuit. It adds a warble to the tone I don't like.
    The 25uF is enough for the bypass as far as audio goes. But looking at it from bias point of view, I tend to prefer the rock solid fixed bias. Thinking off the bypass cap as a filter cap instead and ballparking 40mA, I'll try a 470uF. I think that'll take the warble out of the overdrive. . we'll see...I could ofcourse be full of xxxx and not having a clue..I'll get back to that.. but not tonight. ..
    J
     
    Last edited: Jun 13, 2019
  13. MarshallDog

    MarshallDog Well-Known Member

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    Last edited: Jun 13, 2019
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  14. tce63

    tce63 Well-Known Member

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  15. 67Mopar

    67Mopar Well-Known Member

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  16. MarshallDog

    MarshallDog Well-Known Member

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    Doesn’t get much simpler then that!!
     
    Last edited: Jun 13, 2019
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  17. Sdunn

    Sdunn New Member

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    Great looking set up! I didn't realise you could daisy chain champs in this way, seems obvious seeing it!
     
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  18. Micky

    Micky Well-Known Member VIP Member

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    I run the hi input of my '57 into my DSL5c.
    It is matched perfectly.
     
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  19. johan.b

    johan.b Well-Known Member

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    Yes,.... adding a 470uF across the 25uF cathode cap adds that sturdy big amp feel to the drive and eliminate that ratty-nes I didn't like.. and when needed something more sophisticated, a ge7 with mid cut down(200-800hz) gives that classic black face tone... now I just need to get a different speaker. . going to go for a celestion.. it might be heresy, but I think it'll work better for my needs..
    J
     
    Last edited: Jun 13, 2019
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  20. Im247frogs

    Im247frogs Active Member

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    I just removed the output jack modification mine has and used the hole to do a tone stack lift switch. FRIGGIN AWESOME! Easily 2x as loud (or seems that way) and nice and crunchy. Really fun.
     
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