Red Plating

Discussion in 'Amps and Cabs' started by Red Planet, Oct 15, 2005.


  1. Red Planet

    Red Planet Member

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    I was playing my 100 watt Marshall and cranked it up a little. Then noticed the sound get a little funny. Looked in the Back of the Amp and two of the EL34's were Red Plating.

    Shut it off and let it set a minute and it was doing fine.

    Should I change the Tubes out?

    What are some really good EL34'S in Current Production?
     
  2. Blue Strat

    Blue Strat Member

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    They're likely red plating because the bias is set too hot or something is wrong with the bias circuit.

    Simply changing tubes without rebiasing or fixing the problem could put you in the same situation. If you continue to run the amp like this you'll surely shorten the life of your EL34s.

    In new production, the SED EL34s are excellent.
     
  3. Red Planet

    Red Planet Member

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    I've got two quads of those I had put in a Lonestar Combo and finally had to take em out. They sounded great but rattled til it drove me insane.

    I might try one set of em and get it biased. Maybe in the Head they wont rattle so bad.

    Its got some kind of Ruby Tubes in it. Chineese I guess. Big Bottles with a brown Base.

    Funny its kind of an Oxymoron. It has Chineese Power Tubes and a Set of NOS Mullard ECC83's in the Preamp.

    When I put the Mullards in it I couldnt tell a difference in the tone. Might be the Power Tubes or the Modern Amp?

    The Mullards make a huge difference in my 18 watter.

    I dont know what the preamp tubes are I took out. They say Marshall VLVE-00041 WK39 or VLVE-00035-18 WK37
     
  4. Blue Strat

    Blue Strat Member

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    Yes, but did you bias the amp for the tubes or at least check the bias? You can't assess new tubes without biasing the amp for them.
     
  5. Red Planet

    Red Planet Member

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    The Lonestar is a Boogie. Boogies dont Bias without solder. They sounded great in it just rattled like hell.

    I might try a Quad of em in the Marshall and get it biased for em. Do you think they will sound better than those Rubys and be more reliable?
     
  6. Blue Strat

    Blue Strat Member

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    If the tubes were selected for the Mesa, they should've been ok. Just because there's no bias pot doesn't mean that you're relieved of checking the bias to be sure they're ok.

    I don't know which Ruby's you had. They sell everthing including Svetlanas with the Ruby label on them.
     
  7. Red Planet

    Red Planet Member

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    The Rubys are big bottles. Not quite as big as a 6CA7 but much larger than most EL34's I've seen.

    Whats kinda screwy though when they red plated only two of em did.

    If your looking at the back of the amp the two on the right end.
     
  8. Blue Strat

    Blue Strat Member

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    Try swapping the tubes around and see if the red plating stays with the sockets or the tubes.

    I highly recommend having a tech check this out for you.
     
  9. Red Planet

    Red Planet Member

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    I'll try swapping them around. Good Idea!

    It only did it one time and hasnt done it since. I've had this happen many times before with lots of different amps and tubes. I knew what to look for when it happened and shut the amp off imedeately. In the past I allways just put new tubes in.

    I'll get it checked out this week. Probably have the SED's dropped in there and biased. I have eight of em matched and could go a while without Biasing. Plus I know what these are so I could just buy some matched to these in the future.

    I looked on the Ruby sight and they appear to be the New Chineese EL34BSTR.

    Would you say the SED's are better?
     
  10. Blue Strat

    Blue Strat Member

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    The Chinese tubes don't seem to have the durability of some of the others though some do like the tone.
     
  11. Red Planet

    Red Planet Member

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    Thank you for your time dude. :)
     
  12. Roccaforte Amps

    Roccaforte Amps Member

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    You're having a bias failure, or the tubes are running away.
    Were they both on the same side?
     
  13. Red Planet

    Red Planet Member

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    Yes they were both on the same side. It was the two on the right end. In other words if they are numbered from left to right 1 2 3 4 . It would be 3 and 4.

    I recently bought the amp used and it has the factory Tubes in it. It is about a year old and wasnt ever used very much.

    It sounds great and has only done this one time. I better get those tubes out of there.
     
  14. rastaman

    rastaman Member

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    Red Planet is Red Plating, is that where you came up with your moniker.
     
  15. Red Planet

    Red Planet Member

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    No.

    I got it from Mars where I origionaly originated from.

    Nano Nano. :D
     

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