CK6418

Is CK6418 and JAN6418 (CE93257) just alternate markings of the same Raytheon tube?

Yes Michael,

CK6418 is the Raytheon proprietary code for the RMA-EIA registered 6418. The prefix JAN, Joint Army Navy, was sometimes added to the RMA code by those suppliers in the QPL (Qualified Products List) for any specific item. Anyway almost the entire Raytheon subminiature tube production was qualified for military applications.

The CK6418 was also known as CK548DX, the early Raytheon developmental code.

Emilio

so should plain "6418" have a separate page as it currently has?

Should photo & data of JAN6418 be here or 6418 or a new page?

Michael,

you should always refer to the basic type, the 6418 in this case. For some types were also entered duplicate codes with the manufacurer prefixes, as CK for Raytheon od GL for General Electric. I am quite sure that this duplication often causes confusion, since the same manufacturers used alternate coding systems depending upon the production lots and/or the customer orders.

Anyway you can find all the variants entered for a given RMA-EIA code, specifying that the search should 'Contains' the code, rather than 'Starts with' the same. Probably it should be better to change the order of searching criteria, offering the 'Contains' option as default.

About the tubes with code starting for JAN-, remember that JAN is not a code, but just an indication of compliance to a military approved production process and screening. JAN alone was used in the late supplies, when even non US manufacturers were involved in the vacuum tube productions. Often in the past JAN prefix was followed by a group of letter indicating the manufacturer. Refer to this JAN- for a list of known US manufacturer codes.

Thank you that makes perfect sense.

So I will add the tubes I got and photos, data etc to the 6418 page.

I got them really just because only 10mA Filament. I want to compare with 12mA 1.2V Russian 1j24b valves. I think perhaps there is a hearing aid tube even lower power, 0.7V so that two filaments in series run off one 1.4V silver oxide cell or similar. But I don't know a part number to order or search or remember exactly what the filament current might be.

Anyhow it's amazing that in about 25 years the valve designers had reduced the filament power about 1000 fold. (about 10W to almost 10mW)