Paul and the reflector, CQ magazine for November 1957, the annual antenna issue, has a very good and lengthy article on the construction of an HF amplifier utilizing two 4-400 A tubes. It uses a multiband switching grid input and I think the grid coil turret was the Harrington. It used a B&W final tank coil. I think there might have also been an AM modulator, I really don't remember for sure. My magazines are in Louisiana and i am in Colorado, otherwise, I could pass along the page number. 73, John, K5PGW
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