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RE: Ah yes - a toroid interstage!

LL1660/20 will be about right for 71A in 4.5:2+2, otherwise its 1:0.9+0.9 but needing ~40mA for 0.9T. depends on your gain structure. i've been here with 01A - 71A both fil. biased into 1660S PP to 300B, but it was custom gapped for the latter config. sounded good. bud purvine winds a good IT. Goodluck.

shane

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