Two, Hammond branded, Westinghouse manufactured, 7591 tubes. Westinghouse can be identified as the original manufacturer based on inspection, but also by the "337" manufacturers code printed on the base that uniquely identifies Westinghouse. Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure. Firm bases, excellent gettering. Tubes are matched for dynamic gain and structure- test at 7500, 7375 where pass/fail is 4250 micromho. The tubes have the same structure inside and out, having matching date codes of "626", the 26th week of 1966.  When you look at these 7591's, you can almost buy them based on the gettering quality and sheen on the bakelite base- because these tubes have a very high output power for their size, 7591 tubes that are "very used", burn the gettering and disintegrate their bakelite bases.  These are very nice on both points.

Many other lots of tubes for sale this week.

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