closest tubes (current & NOS) to 7581A's and sylvania STR's?

Discussion in 'Amps and Cabs' started by coolhand78, Jul 17, 2008.

  1. coolhand78

    coolhand78 Supporting Member

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    Just looking for some options for tubes for my vibroverb....

    currently have JAN Philips 7581A's in them coz i like the extra headroom...

    any other suggestions trying to cap the price around $200 for a matched pair..

    cheers
     
  2. Bluewail

    Bluewail Tone curmudgeon Silver Supporting Member

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    No good suggestions but I love the Phillps 7581A's. If anyone knows a source, let me know.
     
  3. GuitarsFromMars

    GuitarsFromMars Member

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    I believe 7581A's are a mil spec version of the 6L6GC...Blue Strat will know.
     
  4. veldt666

    veldt666 Member

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    I have used 7581's in my various Fender & more recently Fuchs amps, & IMHO, no other 6L6 type comes close.

    I have done extensive comparisons over a 5 year period, not just bench tests, but doing 3 -5 gigs a week, changing out valves after a few gigs, to compare other makes.

    If the day came when I had no 7581's left, then I would use NOS wgb's,(slightly more around than the 7581's).
    Current production fav, is TAD6L6GC big bottle.

    Iv'e not yet tried the Tung sol re - issues, so the jury is out on those at this time.
     
  5. coolhand78

    coolhand78 Supporting Member

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    they really are great tubes (7581A's) does anyone know where u can get good matched pairs...

    Any particular wgb's? What about winged c's, i need a good back up set if i cant find the 7581a's...
     
  6. clunk

    clunk Member

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    7581A's are a milspec version but rated for 5 watts more than a 6l6gc. 5 watts more on the screen? grid? I can't remember. Im no tube expert. Bluestrat? Care to chime in?
    Anyway love the sound of these tubes. Very hard to find these days. I know the prices have gone up over the past few years. I remember about 4 years ago being able to find them for around $250 a quad. Seems the price has nearly doubled since then, unless you score a good deal.
     
  7. sickboy79

    sickboy79 Member

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    Tonewise - IMO - for new production stuff - Winged C. Not exactly a 7581A - but, close to the Sylvania STRs.
     
  8. Trout

    Trout Member

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    I read that 7581's are a ruggedized version of the 6L6G,/GB not GC.

    The data sheets I have show " Lower " dissapation than a 6L6GC.

    7581
    Pentode
    Plate Voltage ................................. 360 V
    Grid No. 2 Voltage ............................ 270 V
    Plate Dissipation ............................. 19 W
    Grid No. 2 Dissipation ........................ 2.5 W

    6L6G
    Pentode
    Plate Voltage ................................. 360 V
    Grid No. 2 Voltage ............................ 270 V
    Plate Dissipation ............................. 19 W
    Grid No. 2 Dissipation ........................ 2.5 W


    6L6GB
    Pentode
    Plate Voltage ................................. 360 V
    Grid No. 2 Voltage ............................ 270 V
    Plate Dissipation ............................. 19 W
    Grid No. 2 Dissipation ........................ 2.5 W

    6L6GC
    Pentode
    Plate Voltage ................................. 500 V
    Grid No. 2 Voltage ............................ 450 V
    Plate Dissipation ............................. 30 W
    Grid No. 2 Dissipation ........................ 5 W
     
  9. clunk

    clunk Member

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  10. pfflam

    pfflam Silver Supporting Member

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    I have a pair of GE 5881 in my Vibroverb and they sound frickin-fantastic!
     
  11. DoobieK

    DoobieK Member

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    Phillips NOS 7581 are great tubes. I have a set of TAD 6L6GC that remind me of that tube. Very loud and lots of headroom. Good tone too.
     
  12. coolhand78

    coolhand78 Supporting Member

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    Long or short bottle?
     
  13. Blue Strat

    Blue Strat Member

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    GCs are the long bottle. WGCs are the short bottle.
     

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