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CK6418

Information - Help 
ID = 29670
       
Country:
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, USA (also tubes)
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)
Literature Electronic Universal Vade-Mecum, Electron Valves and Semicondurctor Devices   group 193
-- Original-Prospect   Electronics, July 1957, pg.19
- - Manufacturers Literature

 
ck6418.jpg
CK6418: my collection
Giuseppe Antonio Tusini

 

Usage in Models 1= 1959? ; 1= 1964??
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2

Forum contributions about this tube
CK6418
Threads: 1 | Posts: 5
Hits: 1796     Replies: 4
CK6418 vs JAN6418
Michael Watterson
13.Dec.11
  1

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

 

Emilio Ciardiello
13.Dec.11
  2

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

Michael Watterson
13.Dec.11
  3

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
13.Dec.11
  4

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.

Michael Watterson
13.Dec.11
  5

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)

 

 
CK6418
End of forum contributions about this tube

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