There were tens or hundreds of thousands of 8877/YU-158/YU-209/3CPX1500/YC 257 made by Eimac. Many still out there NOS in the box. You can find hams selling some of these NOS in the box fo r $500.00 You can still get Eimac 3CPX1500's for about 400-500 with a money back guarantee or a free replacement if you get a bad or poor one. These tubes easily have a 30 year or more shelf life. I would never pay $2000+ for a brand new date coded 8877. Chinese 8877 tubes are OK but I would prefer a used medical 3CPX1500 over a new Chinese tube. OTOH I am certain that the quality of run of the mill "brand with your name" 8877 from China is nowhere near as good as the pulse rated MKS 3CPX1500 medical pulls. MKS must have insisted on a certain quality and GOT IT. I have tested hundreds of 8877 tubes and a typical Eimac medical pull can last a ham many years of service. The the price of a new one you can buy 4 or 5 pulls with a MBG or replacement. You will be set for a lifetime with tubes. The RF deck would e an Al-1500.