On Nov 30, 3:59*pm, John Byrns wrote:
In article ,
*Peter Wieck wrote:
What massive, incredibly mis-informed crap.
Please note the interpolations:
On Nov 30, 6:31*am, Andre Jute wrote:
that the most accurate tubes existed
well before the war: 845, 211, 212E, 300A and B, 6L6 which spawned the
KT66 and KT88 that you still like, and, as a byblow of patent
circumvention, the development of the wonderful EL34 and its little
sister the EL84.
Ah, the EL84 - 7-pin miniature.
Did that poor little man Worthless Wiecky really say that? Now you can
see why I have him in my killfile. Even a newbie tube-roller shouldn't
make such a dumb mistake.
Peter's comment about the EL84 is obviously a joke that I am too dense to
understand, can someone please explain?
Ah! You think Worthless has a sense of humour. Methinks that is a
doubtful proposition. The nearest Worthless Wiecky ever came to a
sense of humour was when he was a janitor at a college building, where
his employers used to send him out to walk the cat on a lead, cruel
humour to be sure, but somehow apt to the little man.
As to the rest in that pre-war line-up, most of them were developed by
Western Electric for telephonic and theatre-sound (Recording and
Playback) use. Where reliability and long life meant a great deal more
than absolute accuracy. And with telephoney, 300 - 3400 HZ is all one
got. And with theatre reproduction, even 10%+ distortion was entirely
acceptable.
What massive, incredibly mis-informed crap.
Worthless Wiecky just says the opposite of what I say, whatever I say;
I don't think he cares if no one believes him, if everyone sees
through his pathetic attempts to be a swinging dick.
You obviously have little understanding of telephoney. *Multichannel carrier
systems were in widespread use well before WW2, I suggest you peruse the Bell
System Technical Journal from the 1920s and 1930s to better understand the
implications. *It's been many years since I studied these carrier systems so I
have forgotten many of the precise details, but IIRC these systems required flat
response from the tubes to at least 100 kHz, if not 200 kHz, your 3,400 Hz
response would hardly do. *Even more importantly, a high degree of linearity was
required from the tubes to prevent intermodulation distortion which causes cross
talk between the multiplicity of voice channels transported by the carrier
systems. *Intercity cables would have multiple repeaters, further compounding
the linearity and intermodulation distortion problem.
Bottom line, yes long life was very important in tubes designed for telephoney,
but so was a very high degree of linearity or freedom from distortion, and
frequency response extending to a couple hundred kHz.
And we still get the benefit of their work in the 300B...
--
Regards,
John Byrns
Surf my web pages at, *http://fmamradios.com/
I admire your saintly patience in correcting Worthless Wiecky's
multitudinous errors, but I can't say I aspire to it. Not enough
decades left in my life to turn Worthless into an even half-competent
audiophile.
Andre Jute
Visit Jute on Amps at
http://members.lycos.co.uk/fiultra/
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