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Questions about tubes and gear that glows. FAQ

RE: so which would you recommend...

The 6BL8 is the Fisher phase inverter tube that requires the adapter socket to replace the 7199. The pentode section is the amplifier section and the triode is the actual PI.

7199s have a unique pin out and any substitute will require the socket adapter.

What amp are you proposing the change? For example, in the Scott 340B I use a Mullard E80CF.


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