Two Tested 6146B/ 8298A GE Matched Audio Receiver Ham Vacuum Tubes Madein the USAMetalbase collars, smooth black plates, alignment tabs, dual spacers, gridradiators, halo wire getter frames and base getter flashes.ExcellentANOS conditionPleasereview the photos for more detail. Excellent strong matched NOS test resultsfor Gm/bias: 5.2 with bias ~41 mA 5.0 with bias ~40 mA For Gm, 2.9 is the 60% reject point No shorts detected &nb...sp; For reference we use a Triplett 3444A TestSetEstimateddelivery within the USA is from 3 to 7 business days.Ourstandard shipping is US Postal 1st class.Wecombine shipping when applicable.Please contact us with any questions