Large inverted cup getter / round bell getter. Engraved base / etched / hot stamp. Two National Union NX-45 tubes. Matched N date codes, both made in 1930’s. Type 45 tubes. Tubes test at 2280 and 2230 where 1300 micromhos is pass/fail.
Large inverted cup getter / round bell getter. Engraved base / etched / hot stamp. Two National Union NX-45 tubes. Matched N date codes, both made in 1930’s. Type 45 tubes. Tubes test at 2280 and 2230 where 1300 micromhos is pass/fail.