[ARC5] The 6U8 - what's the big deal with this "toob"

[Leslie Smith]

Hi Glen,
We Aussies have a warped sense of humor.  When I read your e-mail below
I just HAD to laugh.
I'm in the process of building a set - with the idea of "wringing a lot
of performance from a few tubes".
The basis of the idea is a regen (Jones) superhet, along the ideas of
the Simple-X-Super (etc) from the late 50s or early 60s.

Now, as you know this set uses a triode-pentode - either a 6U8 or a
6EA8.  (or maybe 6BL8)
Recently I bought "toobs" from ESRC.
Then I read what you wrote.   Ow GAWD!   Maybe I bought a short-lived
6U8 and not a long-lived 6EA8!!!
Can't remember which.  PANIC, PANIC, PANIC.
Check box of "toobs".   It's a 6EA8.

Thank god!  I'd hate to have one of those shonky 6U8s in MY super-dooper
get everything from nothing set!!!  
As I said, we Aussies have a warped sense of humor.

73 to you
Thanks for replying.
(Just don't frighten me so much next time, ok?)

--
Leslie Smith
[1]vk2bcu at operamail.com


On Thu, Dec 6, 2012, at 9:06, Glen Zook wrote:

The life of the 6U8 generally is nowhere near as long as the 6EA8 which
can be used to replace all of the 6U8 tubes in the KWM-2 and S-Line
equipment EXCEPT for the tone oscillator in the 32S- series and KWM-2
series.  For some reason, the 6EA8 often causes problems when used as
the tone oscillator.  Why?  I really don't know.  Maybe, some day, when
I finally get the time, I might try and see just why the 6U8 functions
considerably better as the tone oscillator.

Glen, K9STH

Website: http://k9sth.com
  __________________________________________________________________

From: Leslie Smith <vk2bcu at operamail.com>
To: ARC-5 List <arc5 at mailman.qth.net>
Sent: Wednesday, December 5, 2012 3:25 PM
Subject: [ARC5] The 6U8 - what's the big deal with this "toob"
Hello List,
I would like to understand the question about 6U8's, in "Collins" mind.
Why is the 6U8 considered to be a "hateful toob".

References

1. mailto:vk2bcu at operamail.com

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