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That is a nice one. I've got a later 6 tube hybrid panny....Mine was missing the damper, installing a new one showed the confusing combo of red-plating H Out Tube, and good grid drive. Eventually i found a red 2KV paper in oil cap out side the HV cage above the tubes that was dead shorted to under 2ohms of resistance...The cap was across a winding of the fly. Needless to say it worked a LOT better after I changed that cap....Heck all it needed beyond that was control cleaning and adjustments.
Beware those Japanese paper in oil caps especially the older grey ones...Most of them will test VERY leaky to shorted.
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