What Is The Difference Between 6JE6, 6JE6A, 6JE6C?

[DavidC]

Follow up to value and replacement cost question for the UPS damaged tubes
- which of the three versions of the 6JE6, plain, A and C is preferable for
the SBE SB2-LA linear? Antique Electronic Supply is asking $40. each!
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Thanks & 73, DavidC AA1FA

[Orville Beach W6BI]

According to the RCA Receiving Tube Manual (1968):

Hmmm... not very enlightening.

For 6JE6, they give no electrical data, just refer to the 6JE6A as the
replacement.
For 6JE6B, they refer you to 6LQ6 as the replacement.
Under 6LQ6, they say the 6JE6C is electrically equivalent to the 6LQ6.

They are physically the same, and what little electrical data is given
appears the same. I suspect that they are sequentially improved
versions of the same tube. I wouldn't mix them in an amp, but I
suspect you could use any of them. If you have the option and the
costs are about the same, I'd go with the latest version. Presumably
they've made improvements in durability, longevity, etc. without
modifying the electrical characteristics. Ideally you'd match them in
a tube tester. Haven't seen one of THOSE since Marconi was a pup...

Of course, I could be way off beam.. Anyone else got any insight into
this?

73 - Orv - W6BI

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Orv Beach W6BI
w6bi@*micom.com
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[Bruce Ferry]

This really takes me back ...

Since these were used as the horizontal output tube for TVs I remember
them well. The "B" version was supposed to be a beefed up version of
the original, the "C" beefier yet. I seem to remember them adding
extra fins on the plate to improve heat dissipation. Common problem
was overheating when the flyback transformer was on it's way out. Some
sets just normally overtaxed the thing and it always ran warm (read
dull red glow).

The 6LQ6 was tougher still - I seem to remember that the actual plate
area was bigger (taller) and it's the preferred replacement (at least
in the TV land).

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Bruce Ferry