Two, NEW in box, Hytron-National Union, #45, matching date pr, UX-245, CX-345 eq For Sale

Two, NEW in box, Hytron #45 tubes, with the shouldered glass envelope. These are branded Hytron, but they were actually made by National Union (wartime manufactured 45 tubes were uniquely sourced from only Sylvania, Tung Sol, National Union, and rarely RCA with the other brands buying 45 stock from these manufacturers and re-branding). These are of course exact equivalents to the UX245/UX-245, CX345/CX-345, 245, and 145 tubes. Silver, printed logos, black plates. Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure. Firm bases, excellent silvering. Tubes are matched for dynamic gain and structure- test at 2300, 2200 where pass/fail is 1170 micromho. The tubes have the same structure inside and out, having matching date codes of \"7A4\", MR (maintainance and repai,r a wartime term for tube manufactured for the civilian market).

Many other lots of tubes for sale this week.

Shipping is free within the continental US. Elsewhere- exact postage only, no packing fee.