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RE: tube reverb driver in Guitar amp - impedance matching question

I once ran a test on a E6400 reverb drive xfmr from a Gibson, and found the turns ratio to be 2.6:1.

Gibson always used a 4FBxxxx tank, which has a 1,457 Ohm input impedence (it will measure around 200 Ohms DCR).

You can calculate the plate load from this info. In practice, I have found it to be not very critical. I ended up using a 70V speaker line stepdown transformer and selecting a secondary tap that gave good drive to the tank without distortion.


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