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Information - Help 
ID = 29670
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  Vacuum Pentode   Text 
Identical to CK6418 = 6418 = CK548DX

Base Subminiatur (wire-ends, flat) B5A Wires only.
Filament Vf 1.25 Volts / If 0.01 Ampere / Direct / Battery =
Description Long-life tube also proposed for high-rel, low-power computer applications. Registered code for Raytheon CK648DX, subminiature power pentode for use as hearing aid output amplifier. T1.5x2 bulb, flat press.
22.5V at 0.24mA max plate, -1.2V G1, 22.5V at 0.06mA G2. 2.2mW across 100K load. 
Dimensions (WHD)
incl. pins / tip
7 x 32 x mm / 0.28 x 1.26 x inch
Tube prices 1 Tube prices (visible for members only)
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   group 193
-- Original prospect or advert   Electronics, July 1957, pg.19
- - Manufacturers Literature
  CK6418: Funkschau 19/66 S.605
Egon Strampe
CK6418: my collection
Giuseppe Antonio Tusini


from Just Qvigstad

Usage in Models 1= 1959? ; 2= 1964?? ; 2= 1966 ; 1= 1968

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):6

Forum contributions about this tube
Threads: 1 | Posts: 5
Hits: 3756     Replies: 4
CK6418 vs JAN6418
Michael Watterson

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


Emilio Ciardiello

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.


Michael Watterson

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?

Emilio Ciardiello


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.

Michael Watterson

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)


End of forum contributions about this tube

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