Thinking on it a bit today, I think these are probably made by Tung-Sol.

The 45 circle emblem and the mica supports on the side support this.

New Old Stock S-Silvertone 45 pair in original boxes.

Test 2650 & 2650 where 1100 is good in Triplett 3444/Westmore 501 laboratory tube analyzer, restored and calibrated by Paul Hart.

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