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New Amp Day! Fender Bronco (vibro champ)

Discussion in 'Amp Central Station' started by adamkavanagh, Oct 23, 2017.

  1. adamkavanagh

    adamkavanagh Tele-Holic

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    Picked up from a friend of a friend.
    [​IMG]
    He fixes up tube amps and usually adds boost mods to them.

    Anyways, this thing sounds great! It's small and light.
    Exactly what I've been looking for.

    I think they are friends.
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    Sorry for the poor lighting.
    I have more pics of the guts and stuff if you folks are interested.
     
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  2. snottyboy

    snottyboy Tele-Meister

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    Nice looking couple...congrats!
     
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  3. Jimmy Owen

    Jimmy Owen Tele-Holic

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    A perfect pair. Great little amp.
     
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  4. MickM

    MickM Poster Extraordinaire Platinum Supporter

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    Nice amp, I've yet to see one in person let alone buy one. And of course we're interested in gut pics you silly wabbit. I think it was Hemingway that said "No gut pics-no guts".
     
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  5. theprofessor

    theprofessor Poster Extraordinaire

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    Nice! Enjoy it! I hope one day to find another one of these for myself.
     
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  6. Dacious

    Dacious Poster Extraordinaire

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    That's the bother by another mother to a Silverface VibroChamp which is the same relationship to a BF Vibro.
     
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  7. keithb7

    keithb7 Friend of Leo's

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    Nice find. Enjoy that amp.
     
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  8. Silverface

    Silverface Poster Extraordinaire Platinum Supporter

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    Did you make sure it has a newer filter cap can? IF it still has the original it's WAY out of date - needs to be replaced asap.
     
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  9. String Tree

    String Tree Doctor of Teleocity Ad Free Member

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    I can hear it from over here!
    SWEET!!!
     
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  10. adamkavanagh

    adamkavanagh Tele-Holic

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    Good point! I'll have to check the serial number etc on that cap can. Just based on visual inspection, it looks like it's original.

    If I were to replace it myself (I have electronics experience, I repair guitar pedals for a living) is there a good video somewhere to learn tube amp high voltage safety? I do not work with high voltage so I don't know what to watch out for. Thanks!

    Here are some guts. Very clean.
    I was concerned with the flexing of the ptp board but I've seen many others doing this after a google image search.

    [​IMG]
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  11. Wally

    Wally Telefied Ad Free Member

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    Nice get. Ime, that Emi 820H is one of the darkest speakers I have come across.
     
  12. adamkavanagh

    adamkavanagh Tele-Holic

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    I believe you actually, the tone controls aren't extremely expressive due to the darkness of the speaker I'm guessing. But it doesn't bother me because the tone is great.

    Come to think of it, I have yet to try it with my es335 so that might change my mind.
     
  13. Wally

    Wally Telefied Ad Free Member

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    There is a new bias cap there....that is a positive thing.
    Re: that 820H.....I have come to the conclusion that I don't care for hemp cones unless I have an
    extremely bright amp. The first hemp cone I played through was a Red Alnico tone Tubby....high dollar speaker. It didn't work for me, either. I find them inarticulate and muddy...the high harmonics are not there. And...no...I have not lost my high end hearing.
     
  14. Commodore 64

    Commodore 64 Friend of Leo's

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    Cap can looks original, and there's some ugly white mallory electrolytics on the preamp cathodes. It needs a cap job, IMHO.

    And I must confess I don't know whats going on with the fiber board next to the PT bolts. And there's still a death cap in there.
     
    Last edited: Oct 24, 2017
  15. adamkavanagh

    adamkavanagh Tele-Holic

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    Can anyone tell me if that cap between the xformer and the fuse is the needed 'death cap' ?
    thanks!
     
  16. adamkavanagh

    adamkavanagh Tele-Holic

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    ugly white caps eh? any recommendations for replacements?
     
  17. Commodore 64

    Commodore 64 Friend of Leo's

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    If I'm buying e-caps I go with Nichicon or panasonic radials (mouser), usually. F&T Axials are great as well.

    The blue cap between the fuse and the chassis is the death cap.

    I don't know what that thing is next to the PT bolts. Possibly a voltage dropping zener, which shows the previous tech was keyed into the VC tendency to run high voltages. Which makes it all the more puzzling that the e-caps are still stock. The tech certainly wasn't lazy. Though some techs espouse leaving ecaps original if they are performing/reading OK.
     
  18. MickM

    MickM Poster Extraordinaire Platinum Supporter

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    100% with you on the Alnico TT. Think I paid around 280 bucks for one 10 yrs. ago and couldn't dump it fast enough. I remember thinking that I could've copped a 40 dollar Radio Shack Special, hung a wet blanket in front of it and got the same muddy tone.

    Thanks for the pics OP. I see the boost toggle and 8 ohm speaker jack. Have you tried the boost and a 1x12 cab?
     
  19. adamkavanagh

    adamkavanagh Tele-Holic

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    Thanks for the info!

    for anyone who's interested I found this awesome video on Tube Amp Safety
     
  20. Silverface

    Silverface Poster Extraordinaire Platinum Supporter

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    I hadn't seen that - it's very concise and clear - but he does not tell you how to recognize every type of high-voltage cap or connection (for example, there's nothing about your can type of multi-cap and how the positive and negative terminals are marked).

    Make sure you study up on circuits and all high-voltage capacitor types so you know where they might be and how they might be connected.

    You also need to know where other high-voltage connections are . Many connections are nowhere near the caps themselves.

    These things are what bother me about "safety videos". Like this one, every other I have seen is sadly incomplete.
     
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