Description

This is a NOS pair fairly close matched pair Jan CHS VT-100/807 power vacuum tubes. These were manufactured for the Navy by Sylvania Corporation. Acceptance date on the original boxes is April 1945. They have been fully tested using a calibrated Hickok 539C tube tester. These tubes are in excellent electrical and physical condition. Tested as follows for transconductance and plate current. Tube#1. 4500/2500 at 35 ma plate current Tube#2. 4600/2400 at 30 ma plate current The 2400 is what the 539C tube tester accepts as a passing grade. However tubes below this figure ae not bad but merely express the variation in tube transconductance compared to a new tube. Vacuum tubes transconductance below this level are still good tubes and in most conditions were perform quite well. These tubes 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.