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Thread: 6v6, 6f6

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    Member gayler's Avatar
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    6v6, 6f6

    Can they be interchanged?

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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.

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    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.

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    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

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    Building a better world (one tube amp at a time)

    "I have never had to invoke a formula to fight oscillation in a guitar amp."- Enzo

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    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.

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    ...and the Devil said: "...yes, but it's a DRY heat!"

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