Hi All
I had always been under the impression that a 12KP4 tube did not require an ion trap. Yet today, I was looking at the descriptions for the 12KP4 and 12KP4A, and correct me if I am wrong, but is it only the 12KP4A that does not require an ion trap.
12KP4 description, states "prevents ion spot blemishes" which makes me wonder if it means it still used an ion trap
http://tubedata.milbert.com/sheets/093/1/12KP4.pdf
12KP4A description states "does not require an external ion trap magnet"
http://tubedata.milbert.com/sheets/093/1/12KP4A.pdf
Pardon my ignorance, but am wondering if there is any difference between a 12KP4 vs 12KP4A
thanks
Ross