Who makes these 6550's ??

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Just bought a bunch of tubes at the local hamfest & found a pair of NOS 6550 tubes. Boxes trashed by mice, tubes look great. They are marked "INTERNATIONAL" in white ink & have etched "6550" with "U S A" etched just below "6550". A pair of round getters up top & one round getter on the side. Date cod is 922-1281. Cheap junk or keepers??
bob

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Topic - Who makes these 6550's ?? - rja1 14:02:12 03/23/06 (2)

Re: Who makes these 6550's ?? - MIchael Samra 21:13:03 03/23/06 (0)

Re: Who makes these 6550's ?? - tvr2500m 17:25:15 03/23/06 (0)

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