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The Heathkit IT-5320 uses a Beltron-style method that requires varying filament volts while monitoring current on the 300 vdc it uses to rejuv. In 40 years, it has never let me down or stripped a cathode. There are some tubes that were not restorable.
My BK 467 and 466 are in the junk pile, as they both need some repairs.
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"When resistors increase in value, they're worthless"
-Dave G
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