My 1960 Tremolux blew a power tube

Discussion in 'Amp Tech Center' started by Uncle Mitchy, Sep 24, 2020.

  1. Uncle Mitchy

    Uncle Mitchy TDPRI Member

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    My old Tremolux blew a power tube. My tech suggested replacing both 6L6's with a matched pair. He added some screen resistors (470R) before the power tubes. Can I expect any tonal differences from the resistors? Are they needed?
     
    Last edited: Sep 24, 2020
  2. Jon Snell

    Jon Snell Tele-Holic

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    They should have 470 - 1000 Ohm screen resistors to limit the screen current and help protect the valves.
    They make no difference to the sound.
     
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  3. rangercaster

    rangercaster Poster Extraordinaire

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    Were they the original tubes ???
     
  4. DjimiWrey

    DjimiWrey Tele-Meister

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    I suspect there will be some tonal differences
    I've even noticed tonal differences in 6L6s manufactured in USSR vs USA
    but the differences might not be bad, just different
     
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  5. Uncle Mitchy

    Uncle Mitchy TDPRI Member

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    That's what I hoped! Thank you for answering. Mitch
     
  6. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    If there is a noticed difference, it would most likely be attributable to the different power tubes. New vs worn... build differences, etc.

    Roll some tubes.;)
     
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  7. SnidelyWhiplash

    SnidelyWhiplash Friend of Leo's

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    Has the amp been serviced? Filter caps, etc.???
     
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  8. Wally

    Wally Telefied Ad Free Member

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    +1 on the service. And...the piggyback Tremolux was first introduced in 1961 according what I find. The first ones had 6V6 power tubes followed by 6BQ5/EL84s and then 6L6s. The tone ring cab was discontinued in 1962.
     
  9. archetype

    archetype Fiend of Leo's

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    To build on what @Wally said, what physical configuration (combo or piggy back) and circuit is your amp? Just because your amp had 6L6s in it doesn't guarantee they're the correct tubes for the circuit.
     
  10. Wally

    Wally Telefied Ad Free Member

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    The 5G9 circuit looks like the hottest circuit with more midrange than do the later 6G9 and 6G9A amps. It also does not have a negative feedback loop. The 5G9 carries only three 12A-7s while the later ones carry four of those noval tubes. The 6G9 uses 6BQ5/EL84s while the A version uses 6L6s. If there are four 12A-7s and octal tube sockets for the power tubes, you have a 6G9A....and it is not a 1960 amp, imho. It could be a 1961 fro: later i; the year..or a ‘62 or ‘63. Insufficient data at this point to say for sure about those three years.
    Fwiw, a vintage amp tube tech with the amp on a bench in front of them would know what circuit is there and what year the amp is from, ime.
     
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