[Heathkit] DX-60 Final Amplifier Tube Question

[Glen Zook]

With a few exceptions, manufacturers which actually turned out some very poor examples, the 6146W, made after mid 1964, is exactly the same as the 6146B/8298A.  Usually, a "W" suffix means ruggedized for military use.  However, the 6146B/8298A was designed by RCA for commercial two-way use which has basically the same need for a rugged tube.
 
Glen, K9STH


Website:  http://k9sth.com


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 From: Richard Knoppow <1oldlens1 at ix.netcom.com>
    One source, which I can not now find, states that tubes 
with a W suffix were made for military contractors. They may 
have had different tollerances than the civilian versions 
but do not appear to be different tubes.