2 NOS tubes E88CC 6922 Siemens Munich 1963 "A3 8C" matched pair Lot08 211

FYI: These tubes are measured in autobias mode according the manufacturer data sheet.More information you find at the end of this describtion2 x NOS tubes E88CC 6922 Siemens Halske Munichoriginal boxesmatched pair 1963label inside code: A3 8Clot no: 08 211Flawless test results across all parameters. Like-new condition.Free of other defects such as grid current, vacuum issues, or noiseEmission = Gm 14,400+13,600 and 14,200+13,600 (100% = 12,500 ±2,500 )Current = 15,2 +15,3 and 15,2 + 15,1mA (100% = 15mA ±0,8mA)Produced by Siemens Munich plant What does this test result mean? High emission and symmetrical and balanced tubes.Measuring device used: RoeTestV11.Measurement mode: Autobias as specified by the manufacturer.In autobias mode the tube is measured with a constant anode current. This corresponds to the application in the device.Note: Most tubes offered on ebay are tested with a fixed grid bias voltage. Such a measurement contains a general system error. The desired result in the application is therefore purely random.