I have a little practical experience with various "B" & "W" variations.
The GE 6146B and ECG-Philips (old Sylvania) 6146W tubes work well in the
Kenwood HF transceivers, and have comparable life spans. This has been
verified by one Kenwood service shop which has used hundreds of the ECG tubes
over the last several years.
The generally available GE 6146W definitely DOES NOT hold up in the same
application.
I would suspect that the GE 6146W may be of the "A" category.
Merit, W6NQ
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