All tubes are tested using a Hickok 752A tester. Minimum or "min" micromhos (Gm) values are per the 752A's Minimum Mutual Conductance rejection values roll chart for amplifier tubes and amplifier sections of multi-purpose tubes. Similarly, the rejection values for rectifier and detector type diodes are also listed as "min" values.
*** Listed here is a previously used GE 5R4GYB Rectifier Tube from 1973 with 4 Hole Smooth Black T Plates, Side O Getter, CH date code - Tube #1049 ***
See Test results below and note tested Gm values compared to the "min".
Printing on the tube is mostly intact (see pics). Packed in White Tube Box as original is not available.
Tube will be shipped within two business days and shipping is via USPS First Class Mail / USPS Ground Advantage for items weighing less than 16 ounces as these services are about the fastest delivery method anymore without costing an arm and a leg. Multiple tube purchases at one time will allow combined shipping at a discount. Tube will be packed extremely well for safe delivery.
TEST RESULTS:
Tube #:
1049
Tube Type:
5R4GYB
Brand:
Manufacturer:
GE
Mfg Date:
1973
Production Type:
4 Hole Smooth Black T Plates, Side O Getter, CH date code