EL34/6CA7/KT77

Introduced in 1949 by Philips, the EL34 is a high power pentode power tube commonly found in guitar amplifiers of European design. The American equivalent is the 6CA7. The EL34 delivers a very different sound than the 6L6 because the EL34 is a pentode and the 6L6 is a beam tetrode. With some modifications most EL34 amplifiers can be modified to use 6L6 tubes, and vice versa.

The E34L tube is a variation which can handle a higher grid bias and is generally interchangeable. The E34L can be set up to offer a cleaner sound with a little more bottom end than an EL34.

The 6CA7 is constructed very differently with a larger glass envelope and a beam forming plate like a beam tetrode uses, but has very similar electrical characteristics than the EL34, and a different sound.

The KT77 was released by GEC as a superior version of the 6CA7 optimized for high fidelity audio and is the cleanest EL34 variant. It is generally interchangeable with all EL34 tubes, but check with your equipment manufacturer to be sure.
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    Valve Art Power Vacuum Tube, EL34 SKU#: T-VA-EL34
    $14.95
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    Tube Amp Doctor Power Tube, EL34 SKU#: T-TAD-EL34
    $23.50
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    Mullard Reissue Power Vacuum Tube, EL34 SKU#: T-MUL-EL34
    $27.25
  4. Rating:
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    JJ Power Vacuum Tube, KT77 SKU#: T-JJ-KT77
    $19.75
  5. Rating:
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    JJ Power Vacuum Tube, EL34 SKU#: T-JJ-EL34
    $19.75
  6. Rating:
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    JJ Power Vacuum Tube, E34L Blue Glass SKU#: T-JJ-E34L-BU
    $20.10
  7. Rating:
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    JJ Power Vacuum Tube, E34L SKU#: T-JJ-E34L
    $19.75
  8. Rating:
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    JJ Power Vacuum Tube, 6CA7 SKU#: T-JJ-6CA7
    $24.63
  9. Rating:
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    Electro-Harmonix Power Vacuum Tube, 6550 SKU#: T-EH-EL34
    $21.35
  10. Rating:
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    Electro-Harmonix Power Vacuum Tube, 6CA7 SKU#: T-EH-6CA7
    $28.65
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