Description: 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 MATCHED PAIR of NOS (new old stock) RCA 5R4GYB Vacuum Tubes from 1966 and 1964 with Fat Bottles, Brown Bases, Black 4 Hole T Plates, Top Side Hanging O Getters and 6635 & 6426 date codes respectively - PAIR #145 (Tube #931 & Tube #934) *** See Test results below and note tested Gm values compared to the "min". Printing on the tubes is excellent. Packed in Original Tube Boxes. Tubes will be shipped within two business days and shipping is via USPS First Class Mail for items weighing less than 16 ounces as First Class Mail is just 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. Tubes will be packed extremely well for safe delivery. TEST RESULTS: Tube #: 931 Tube Type: 5R4GYB Brand: Manufacturer: RCA Mfg Date: 1966 Production Type: NOS, Fat Bottle, Brown Base, Black 4 Hole T Plates, Top Side Hanging O Getter, 6635 date code Test Date: 10/1/2022 Grouping: PAIR 145 Gm 1: 975 Gm 2: 925 Min 1: 650 Min2: 650 Leak: No Tube #: 934 Tube Type: 5R4GYB Brand: Manufacturer: RCA Mfg Date: 1964 Production Type: NOS, Fat Bottle, Brown Base, Black 4 Hole T Plates, Top Side Hanging O Getter, 6426 date code Test Date: 10/1/2022 Grouping: PAIR 145 Gm 1: 950 Gm 2: 900 Min 1: 650 Min2: 650 Leak: No
Price: 49 USD
Location: Avon, Colorado
End Time: 2023-10-19T03:55:59.000Z
Shipping Cost: 7 USD
Product Images
Item Specifics
All returns accepted: ReturnsNotAccepted
Brand: RCA
Type: Vacuum Tube
Model: 5R4GYB
Country/Region of Manufacture: United States
