Two brand new Twins with problems

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by burner, Mar 21, 2008.

  1. burner

    burner Member

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    So I recently bought a Fender '65 Twin Reverb and when I got it home it developed problems.
    I took it back and the shop told me it was probably the tubes.
    they swapped out the tubes and it seemed to work fine until I got it home and cranked it up....more problems.
    I took it back again and the Fender Rep happened to be in the store and offered to order me a BRAND NEW Twin.
    I wited three weeks for it to arrive and I got it home and left it sitting in the box for several days, because I was hoping to trade it.
    Well...tonight I decided to play it.
    At low volume it sounded fine but when I cranked it up to "5", it started crackling very loudly and one of the 6L6s was glowing red hot (It wasn't before)
    Now, I'm faced with having to get this one fixed under warranty I guess but truthfully I have no faith in these at all and I'd rather Fender give me something else.
    I haven't tried to contact them directly yet,as it just happened tonight.

    So.....
    Can anyone give any insight as to what the problem could be?
    Should I swap the tubes around to see if it's a bad tube before I do anything else?
     
  2. burner

    burner Member

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    Well I just swapped the tubes around and it's hving the same problem which leads me to believe perhaps a bias resistor is burnt.
    Obviously I can't open it up without voiding my warranty....
     
  3. phsyconoodler

    phsyconoodler Member

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    Did the glow stay with the same tube or did the tube in the same socket redplate?
    It is likely a screen resistor or a very loose tube socket.When an amp does that right out of the box it could be that something was seriously jogged inside from shipping.
     
  4. burner

    burner Member

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    The glow stayed in the same socket...not the same tube.
    Anyway I'm taking it to the store today
     
  5. 5E3

    5E3 Member

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    Makes me wonder what (if any) quality control and burn-in the factory is doing? :crazy
     
  6. TheAmpNerd

    TheAmpNerd Member

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    Not very much if any. The bathtub curve shows that most failures
    occur early and late in a products life cycle. Not so good for the
    cheap Fender reissue products...that aren't spec'd right to begin with.

    For you buyers out there it means turn on your new amps and play
    through them....if they are going to fry they will do it sooner rather
    then later (well some will last until the warranty period and then fry).
    Take them back and demand an exchange or a refund and buy something else.

    Wish you the best of luck on this as it looks like hit or miss with some
    of these amps.

    Meaning don't buy and amp that was built right before or after the
    chineese new year!
    :jo
     
  7. burner

    burner Member

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    Well I was able to return it and exchange for a Custom Vibrolux Reverb.
    Nothing beats the Twin for clean but I've already got one and wanted something else anyway so it worked out great ultimately.

    I agree about the failure curve as well.
    I wish the factory would actually test these things correctly but that might take up too much valuable production time. ;)
     
  8. Trout

    Trout Member

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    Thats a product of mass production, to defeat that problem is fairly simple and exactly why guys buy amps from many of the quality boutique builders.

    They burn in the amps well, they also use better quality and screened parts. Actually, they have to, it only takes a couple bad reviews and they are out of business so to speak.

    I think the personalized services they offer far outweigh any " Mass Production Factory Warranty" in the case of an amp I plan on keeping.

    ymmv
     
  9. burner

    burner Member

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    Oh I totally agree and I would have went that route but:
    a) I already have one 65 RI Twin and it works/sounds great
    b) This was a gift from my mom so I didn't complain about a free Twin ;)
    c) a boutique Twin is out of my broke-azz price range.

    Anyway I ended up with the CVR and it's a very good sounding amp.
    Nothing like a real Vibrolux...it's got a lot of gain and breaks up waaaay early....and it screams! (straight into the amp)
    While i like that aspect for somethings, I'm going to have to tame it in this amp because I play very loud and need it as clean as possible.
    I'm sure I can find a happy medium with it.
    Running it A/B with the Twin makes a great clean/OD combo...best OD pedal there is. ;)
     

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