Champ 12 Owners Club

Discussion in 'Amp Owners Clubs' started by Obsessed, Feb 10, 2013.

  1. Chaz-Keys

    Chaz-Keys TDPRI Member

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    Just came across this forum!

    I've had the Champ for about 6 months but mainly use it for keys. It's a red knob in great condition and I've replaced the Chinese 6L6 with a JJ tube. I'm about to look at replacing the 12AX7s but just checking that the existing tubes are the original Chinese ones. So here's some photos. They are badged Fender. Any help greatly appreciated.

    IMG_2374.jpg IMG_2373.jpg
     
    Last edited: Nov 7, 2018
  2. czech-one-2

    czech-one-2 Friend of Leo's

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    Hi, the original tubes in the Champ 12 were USA made, probably GE. Those tubes are Chinese as far as I can tell.
     
  3. Chaz-Keys

    Chaz-Keys TDPRI Member

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    Thanks for the info.

    My plan is to replace the valve (V2) that handles the overdrive channel with a JJ 5751.

    Watford Valves (UK) say..... The JJ 5751 is a low gain version of the 12AX7.The valve produces a gain reduction of between 15 to 30 % when compared to a 12AX7 and gives a cleaner sound if used in the first stage. Ideal for those wishing to clean up their amplifiers distorted tone or simply get more clean headroom.

    Thinking this might be a simple solution to tame the overdrive channel on the Champ. I have also been given a 12AX7 which I think is from a 90s Fender Twin. It says USA on the glass but some of the legend has worn off so don't know if it's any good. I've swapped it and it works - I haven't really AB'd properly but sounded OK. Have a look at the photos.

    Is it OK to use 2 different versions in the pre-amp?

    Cheers

    IMG_2382.jpg IMG_2383.jpg
     
    Last edited: Nov 8, 2018
  4. Chaz-Keys

    Chaz-Keys TDPRI Member

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    Does anyone have any other recommendations for replacement 12AX7As?
     
  5. Lynxtrap

    Lynxtrap Tele-Holic

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    Put the lower gain tube in V1, for two main reasons. The massive distortion is mainly caused by the output from V1 overdriving the first triode of V2, so you probably want to send less gain from V1 into V2. Plus, the other half of V2 affects the reverb (if you use the reverb).

    5751 or any tube with lower gain is worth trying in V1. But it takes a lot to tame that overdrive channel. The risk being you'll end up with a weaker sounding clean channel and a still sh---y sounding OD channel.
    And it won't really increase headroom in the clean channel, as it also will decrease overall volume proportionally.
     
  6. Chaz-Keys

    Chaz-Keys TDPRI Member

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    Cheers - I don't want to lose any gain on the clean channel as that's the one I use most of the time. I'll probably just go for a pair Sovtek 12AX7WC.

    Thanks for your input.
     
  7. DaveKS

    DaveKS Friend of Leo's

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    Original tubes in both my Champ12 (orig owner) were not USA made, all were Chinese like ones above, including power tubes.
     
  8. DaveKS

    DaveKS Friend of Leo's

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    I run RCA7025>Sylvania 5751 in mine, been purring along superbly for close to a decade now.

    Of new production stuff I’d put Svetlana 12ax7 (sounds almost like the old RCA) in v1 and TAD 7025wa v2. TAD are about lowest gain 12ax7 made today, closer to a 5751 but sound better than JJ or anybody else’s 5751 made today, the JJ 5751 sounded awful to me.

    If you really want to tame gain on drive channel get a JJ ecc823, it’s a reverse wired 12dw7, 12ax7/12au7 triodes, it’ll knock Gain knobs sensitivity down considerably. The reg JJ 12dw7 (ecc832) 12au7/12ax7 wont work as well.
     
  9. czech-one-2

    czech-one-2 Friend of Leo's

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    Hmm, I guess I got lucky with mine! :)
     
  10. Wally_Pete

    Wally_Pete TDPRI Member

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    Hello, new member here.
    I own a Champ 12, American made, and I'm planning some mod.
    In september I'm going to bring it to a tech to get this "Effectrode" mod done

    https://www.effectrode.com/knowledg...p-12-amp-into-a-champ-deluxe-with-a-few-mods/

    I just bought for 70€ a 112 used cabinet with an Eminente Maverick FDM speaker and I'll swap the cones in order to take advantage of the speaker's attenuation, since the use as a bedroom amp . Never checked that speaker before but it's got a quite good reputation, plus the FDM attenuation looks like a great option for a 10/12W tube amp.
    Tube wise I found a JAN GE 6L6gc and a NOS JAN Philips 5751. The other tube will probably be a TAD 7025wa.
    Any suggestion for the better placement of these preamp tubes? I am curious to see the outcome but I''ll probably try 7025v1-5751v2 first.
    Other idea/suggestions welcome
     
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  11. FRESHMEAT

    FRESHMEAT Tele-Meister

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    New to the club here! Here on the bottom right is my Made in Brea, California black knob Champ 12. All these are American made except for the tweed BJ and the 68 Custom Deluxe Reverb, both are ( Hecho en Mexico ).
    [​IMG]
     
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  12. Obsessed

    Obsessed Telefied Ad Free Member

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    Wow, nice collection for Fender Amps. You have everything I like covered.
     
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  13. Alter

    Alter Tele-Meister

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    I came across a red tolex version. Nice 6l6 tones, holds it together on gigs!

    [​IMG]
     
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  14. Obsessed

    Obsessed Telefied Ad Free Member

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    Can you take a pic of the leaker inside of your Champ 12? I played one once and it sounded quite different compared to mine and was wondering if they shipped the red ones with a different speaker.
     
  15. czech-one-2

    czech-one-2 Friend of Leo's

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    I'm pretty sure they all used the same speaker.
    I put a JBL D123 in mine and wow, its the perfect match!
     
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  16. Alter

    Alter Tele-Meister

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    Yes it is the original speaker, same specifications.
     
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  17. Obsessed

    Obsessed Telefied Ad Free Member

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    Thanks for checking. I always thought they would be the same like @czech-one-2 mentions, but I played a red tolex one in a store and it sounded really sweet. Yup, I was dumb enough not to check the speaker.:oops:

    The JBL is an interesting idea.:)
     
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  18. FRESHMEAT

    FRESHMEAT Tele-Meister

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    Very cool! Also love the white saw paw
    Very nice! I also love the south paw white Tele with six bridge saddles.
     
  19. Notts77

    Notts77 TDPRI Member

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    I have read with great interest the changing of this and changing of that on what I consider to be one of the best small amps that Fender ever produced. Just my opinion but don't you think that the designer had a better idea of what he or she was about in the '80s with what was available at the time. I have been using the Champ 12 in Snakeskin Tolex for many years and it still sounds better than most comparable amps of today and my unit has everything original including the valves! I dare say that a fresh set might make some improvement but my 72 year old ears probably can't tell the difference. A few pictures to wet your appetite.
     

    Attached Files:

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  20. czech-one-2

    czech-one-2 Friend of Leo's

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    ^Agreed, they are outstanding amps! I must say changing the speaker to a JBL D123 was the bomb though!
    Stock is just fine though!
     
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