RCA Number Type 38 #38 Vacuum Tube Valve Engraved Base Shoulder Shape NOS NIB 1st Quarter BW01

RCA Number Type 38 #38 Vacuum Tube Valve Engraved Base Shoulder Shape NOS NIB 1st Quarter BW01This new old stock, new in box RCA number type #38 tube tested to spec on our Paul Hart calibrated TV7 U. BECAUSE OF THE BIZARRE, INTRUSIVE AND DRACONIAN GERMAN PACKAGING REGULATIONS AND THE SEVERE FINES AND PRIVACY INTRUSIONS ASSOCIATED WITH THEM WE NO LONGER SHIP TO GERMAN ADDRESSES. WE WILL HAPPILY SEND YOUR PACKAGE TO A NEIGHBORING COUNTRY OR MAKE SUITABLE ARRANGEMENTS. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY

new in box Sylvania-MANUFACTURED

These four US-made 7A7 tubes tested as follows on our Paul Hart-calibrated TV7/U where minimum (65%) is 44 and 100% is 68:

It has 93S6 provenance/date codes

Transconductance measured (From left to right): 41

They have double O getters

This matched pair of RCA black plate 5763 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

From left to right

They have engraved / hot-stamped bases

3 rather than 7

Tube One measured 1900/1900 while Tube Two measured 1900/2250 where new/nominal is 2200

There were no shorts or gas

56/58 and 64/64