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Thread: 6v6, 6f6

  1. #1
    Member gayler's Avatar
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    6v6, 6f6

    Can they be interchanged?

  2. #2
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    Quote Originally Posted by gayler View Post
    Can they be interchanged?
    Doesn't look like it.
    Compare the data sheets and the application data if very different in almost all cases.

  3. #3
    Member gayler's Avatar
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    Thanks for the reply. I could see voltages are lower, but I didn't know if they would live. Also didn't know if the amp, 5F1, would be damaged.

  4. #4
    Supporting Member tubeswell's Avatar
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    Pin-out's the same. Bias is about the same. Plate voltage might need to be watched but it shouldn't be an issue with a 5F1 if you were idling the plate at about 340 I reckon. The recommended plate dissipation is 4.5W, so just run a slightly higher cathode resistor, and/or zener down the B+ a bit if it redplates.

    6F6GT/G @ The National Valve Museum
    Building a better world (one tube amp at a time)

  5. #5
    Senior Member Old Tele man's Avatar
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    ...6F6 is a 'true' five-element pentode, while the 6V6 is a beam tetrode...which means different plate Eb-Ib "knee" characteristics for sure.
    ...and the Devil said: "...yes, but it's a DRY heat!"

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