Here are four developmental PM tubes. Each carries a label which reads "This developmental product is being supplied for experimental purposes. Before crystallizing any equipment designs, please contact your RCA field representative concerning future availability. The warranty period for developmental products is 180 days from the date of shipment by RCA.
|This valve has graphite paint covering all the glass except for the input
window. The paint is connected electrically to a base pin via a wire. The type number is C31036, serial K09220,
with D19 written in pen. The number 11336 appears as well but the label is damaged.|
|This sample has a different internal construction, see below.
|This sample carries the type number C7253H10 and the serial A00238. What appears to be
Y9 is written in pen and the number 12362 also appears.|
|This sample has type number C7253H, serial X08563. There are no other marks.|
This file was last modified11:44:32, Sunday July 24, 2016