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Not to be a contrarian, but...

71.236.58.161

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don't you have to concentrate on the details of a phono pre if you want it to work? ;-)

The Blumlein Garter is pretty straightforward, at least the version that uses only resistors is. You are using individual cathode bias for each tube. Figure out Rk and split the value in half. Tie these two in series from cathode to ground. Now tie a 100K or so resistor from the grid of V1 to between the two cathode resistors for V2. Do the same for the grid of V2. Done.

You can easily add an ammeter to each cathode to monitor (or not). If you do this plus the caps, you can check to make sure the idle current has been balanced by the garter then simply remove the caps and you are done. You could even add/retain the balance pot, but that's an unnecessary expense IMO.

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