[R-390] 6C4-The Final Horse Beating?

[Perry Sandeen]

Gents,

Roger nailed it on tube peculiarities and selection.

More could be added about tube production and lot swapping among manufactures but let’s get this
vampire horse wooden staked in the heart, garlands of garlic placed around its neck, and buried in
a mirrored coffin.  Then we can wind down our pacemakers until the next knicker-twister issue or
sheep arrives.  (If we don’t, this could go n as long as the ballast tube comments. HiHi)

The following note is being added to Chapter 7 Parts List Revision.

Note 10:  There is a severe error in the 1956 Army R390-A manual.  It says not to substitute type
6C4W for a 6C4.  It stated that the differences in characteristics are such that the type 6C4W
will not operate properly in the receiver. This is wrong.   Navships 1970 manual lists the 6C4W as
the tube to use.  

The “W” and “WA” postscript designations refer to mechanical ruggedization  specifications. 
Cross-checking of tube reference data bases confirm that the electrical specifications of all
types are identical.  A ‘ruggedized” or “Industrial” equivalent are types  6100 and 6135 among
others.  All  versions will work properly.   Some may be quieter or last longer.  See Chapter 9
supplement for additional tube information.

Regards, Perrier


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