Description

You are looking at a vintage Cunningham CX-250 power triodes. These vintage globe shaped vacuum tubes have been fully tested and matched using a calibrated Hickok 539C tube tester. They have been tested and matched for transconductance in uMhos (Micromhos ) and plate current in milliamps (Ma.) Tested as follows: Tube 1. 2000/950 at 18 milliamps of plate current The 950 number is that level of Gm for a passing tube as of this type using the Hickok 539C tester In addition this tube was checked for shorts and leakage during testing and none were noted. This tube has clean pins, tight base to (Bulb) glass seal. Base of tube is fully engraved and legible, No cracks or chips. Overall this is a surpurb type 50 vacuum tube. Approaching 100 years old. This tube will be shipped USPS Ground Advantage within the USA 50. International Shipping will be USPS First Class Small package. Thanks for looking and see the other items listed by the Museum. The New England Wireless and Steam Museum is a 501(c)(3) non-profit organization established over 60 years ago. We seek to spark curiosity and learning by showcasing engineering achievements of the past and their connection to the technology that fills our lives today. The items listed are surplus to our displays and help support the mission and programs of the museum. Our collection, located in East Greenwich, Rhode Island, exhibits thousands of pieces of early wireless communication gear and stationary steam engines. For further information please visit www.NEWSM.org. Thank you for your support.