5881 vs. 6L6GC

Discussion in 'Amps and Cabs' started by longgonedaddy, May 10, 2008.

  1. longgonedaddy

    longgonedaddy Supporting Member

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    I tried to do a search, but I got way too many threads that didn't directly answer my question. If I have an amp that requires 6L6 tubes, and has an adjustable bias, can I safely use 5881's?
     
  2. Sean French

    Sean French Supporting Member

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  3. Blue Strat

    Blue Strat Member

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    Not necessarily unless you're talking about Russian "5881s" which aren't really 5881s.

    REAL (US made) 5881s won't handle the same plate voltage or produce the same power as 6L6GCs (the GC suffix is critical to this discussion. "6L6" doesn't include enough information).

    What amp are we talking about?
     
  4. Sean French

    Sean French Supporting Member

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    Well,the 5881' I tried in my 6L6 based TR were Sovtek.
    Had tried TAD 6L6' too and and stayed with my fav 7581'.




     
  5. Blue Strat

    Blue Strat Member

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    Yep, the Sovtek (Russian) 5881s are ok in 6L6GC circuits. NOS, US made, 5881s may not work in all 6L6GC circuits.
     
  6. longgonedaddy

    longgonedaddy Supporting Member

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    I have a Heritage Patriot, and the 5881's in question are MojoTone label. There are no other markings on the tube.
     
  7. Blue Strat

    Blue Strat Member

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    Those are probably the Russian ones. A photo would help.
     
  8. longgonedaddy

    longgonedaddy Supporting Member

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  9. solitaire

    solitaire Senior Member

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    Yeah, these are clearly modern vintage sounding valves. You can see on the platestructure and the base it's not 6L6WGBs (ruggedised 6L6GBs), which basically is another name for the 5881. These are what are commonly known as 6L6WGCs, which is C speced valves.

    To date the only modern 5881s and GB valves are those manufactured by Tung-Sol; the short-bottle and the coke-bottle valves.
     
  10. Blue Strat

    Blue Strat Member

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    Actually, there are two, both from New Sensor.

    The older one is usually branded Sovtek and called 5881/6L6WGC. The Tung Sol REISSUE "5881" is also made in the New Sensor owned factory in Russia.

    The Tung Sol company has been gone for decades. New Sensor (owner of the Sovtek, Electro Harmonix, Mullard Reissue, Gold Lion Reissue, etc) brand names now owns the Tung Sol name as well. As they say, "what's in a name?". Not very much as it turns out.
     
  11. longgonedaddy

    longgonedaddy Supporting Member

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    Thanks for all the help:BEER
     

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