[Heathkit] 6293 tube question

[Bob Macklin]

Sometimes the difference is in the filament construction.

Bob Macklin
K5MYJ
Kent (Seattle), Wa,
"Real Radios Glow in the Dark"

----- Original Message ----- 
From: "Ken Kaplan" <krkaplan at cox.net>
To: <heathkit at mailman.qth.net>
Sent: Friday, October 24, 2008 9:53 AM
Subject: [Heathkit] 6293 tube question


> I just got an RCA 6293 (lot 60-22) yesterday. I thought that they were
visibly more robust than
> a 6146. I held it next to an RCA 6146 (lot 58-48) and compared what I
could see of the
> internals and they look the same to me. The plate material is the same
thickness as are all of
> the other visible internal pieces. Am I mistaken about visible internal
differences or - drum roll
> - have I been scammed? The marking on the tube looks original (just like
those $50's I have
> stacked in a shoe box - just kidding). Is there a way to visually verify
its a 6293 and not a
> 6146? No, I'm not getting out my glass cutter. Heath content? It's for my
SB-110A.
>
> 73 Ken kb7rgg
>
>