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You could approximate, based on turns count, spacing and diameter, or Motorola application notes.
Try posting a photo of the coil in question here as well.
If it has an FCC ID, start there. If it doesn't, it's most likely junk. Ameritron, Metron, Cubic, Ten-Tec, TPL, are old school solid state. Modern day LDMOS, do your research, plenty out there.
If the amp uses HG devices, it is trash.
Not from what I have seen. Horrible construction, the cheapest parts possible and oscillates like a kazoo, when driven below recommended limits. Spurs-a-plenty. But, he says, his amps don't spur. Must be some kind of voodoo in here that makes his junk special.
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