Acknowledging all the reports and notes about the various types and
specs of the 6146-series tubes, I can only add that I use 6146Ws, date
coded in the 80's, in both the modulator and final of both my Valiant I
transmitters without any untoward results, whatever. I also use them in
Collins S-line, again without problems, whatsoever. I can neutralize
each of the above I/A/W the published procedures. I am, however, more
vigilant in tube-changing using these tubes, given the info currently
available.

PatW wrote:

Just a question about 6146's. Can the Viking Valiant be refitted with B types ?
What are the ramifications involved. Has anyone done this ?
Pat W