What is the best current production EL34 for a Marshall Plexi?

Discussion in 'Amps and Cabs' started by VICOwner, Sep 14, 2019.

  1. big mike

    big mike Plexi Loving Admin Staff Member

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    With all the preamp clipping in the Yeti schematic I doubt you'll hear much difference.
     
  2. big mike

    big mike Plexi Loving Admin Staff Member

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    Absolutely the circuit is important. Just cuz something is 'marshally' doesn't mean the power tube will have a large impact on tone.
    Most of this stuff is splitting hairs.
     
  3. big mike

    big mike Plexi Loving Admin Staff Member

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    Dont make a blanket judgment of them all being 'hot' based on the one set you tried in your amp.
     
  4. VICOwner

    VICOwner Supporting Member

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    No of course not, just the two I have are smoking. I wished they were cooler. I got them cheap, usually the cheap ones are weak. Not the case here.
    The match is spot on too. They at this point pass equal current. The Marshall has no hum! Never before have I had a quieter Marshall. Now the winged C’s are not like that. They are about 4mA apart and have a little hum.
     
    Last edited: Sep 18, 2019
  5. big mike

    big mike Plexi Loving Admin Staff Member

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    Luckily one resistor change can get your bias pot into a range you like more.
     
  6. gunslinger

    gunslinger Member

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    I've got to try those.
     
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  7. gunslinger

    gunslinger Member

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    I'm digging the new Svetlanas.
     
  8. RayBarbeeMusic

    RayBarbeeMusic Member

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    I've always just called them Siemens. But I thought they were out of the tube making business long ago; has something changed? Or are we talking NOS?
     
  9. Zado

    Zado Member

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    Maybe, but I have to put new power Amp tubes in there anyway, so it's worth trying
     
  10. big mike

    big mike Plexi Loving Admin Staff Member

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    Nos
     
  11. Humble Texan Fan

    Humble Texan Fan Member

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    Siemens/ RFTs usually have like a dimple on too, hence nicknamed "dimpletops" - super stuff!. And yes: they're NOS, probably made during the cold war.
     
  12. hitchcaster

    hitchcaster Member

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    oh i just picked a random ad.. you could find another seller with no errors in listing for the el34s. and if you bought a 6sn7 you can use it in 12axy slot. just need an adapter and it's a little less gain. they make that as well in this quality version. i tried that but haven't found an amp i like them in better yet.
     
  13. DonP

    DonP Member

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    Interesting. I see 6SN7's used in hi-fi a lot. I've never had an amp (guitar or hi-fi) that used those octal base pre-amp tubes.
     
  14. RayBarbeeMusic

    RayBarbeeMusic Member

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    Ok; not sure why people don't call them Siemens. Back in the day, my 800s came with them, as well as a 50/50 stereo power amp from that era. They were labelled Siemens.
     
  15. big mike

    big mike Plexi Loving Admin Staff Member

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    That's what I always called them as well, but Siemens just contracted them out to RFT.
    I switched to calling them RFT here and other places because that's the flow of the conversation.
    Great tubes, my last 'quad' is spread into 2 amps I have. When they're dead, I'll go with new sensor svetlanas.
     
  16. big mike

    big mike Plexi Loving Admin Staff Member

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    This amp is using the NOS Welded plate Tesla's. Tested NOS when I got from Tube tramp, wherever he got them buffed the blue color off with the GT logo. LOL
    Sound very good, and very very close to the Siemens/RFT. I ran Svetlana in this first for awhile, and the difference was very subtle. Enough I'd forget what was in there.

     
  17. hitchcaster

    hitchcaster Member

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    i have a octal matchless clubman. i tried octal on V1 tweed deluxe recently. i liked the 12ay7 a little better tho. you can get the adapters on ebay and try.
     
  18. DonP

    DonP Member

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    I have a VT-1000 and an old Heathkit tube tester (not that good with it). Sadly, the VT-1000 sort of "locks me in" to tubes that I can easily test with it.
     
  19. jcarpenter

    jcarpenter Supporting Member

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    If your amp can handle it...:dunno switch to KT88's. Or even 6550's
     

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