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Ian Iveson
Guest
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 Posted:
Wed Dec 01, 2004 12:11 pm Post subject:
HTML Catastrophe |
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Anyone know anything about the philosophy of music? Or HTML? I feel
about half-way there.
http://www.ivesonaudio.pwp.blueyonder.co.uk
The 6CH6 amp page looks nearly OK to me, the other amp needs writing
up, and I need help with the philosophy, or "performance" page. The
essential thesis is that music is an interactive pursuit, and so the
listener must play an active part in the performance. Somehow the
reproductionists and creationists must both be right, and the
continuing debate between the two is part of the process of music.
Placing this in the context of established thought is hard, I find.
BTW, I think I have decided to replace the input and concertina
stages of the 6CH6 amp with a direct coupled pair of LTP, using a SS
current source under the second LTP. An ECC88 and ECC82 gives me
enough gain for global nfb. What's good for dropping 100V or so at
around 10mA?
cheers, Ian
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Choky
Guest
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| Posted:
Wed Dec 01, 2004 3:42 pm Post subject:
Re: HTML Catastrophe |
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nice site (for start ;) - in any case better than my page(s) , hehe.........
for dropping-ya mean on dropping 100 V of Ub?
in that case , plain 3W 10K resistor + 47uF will do fine .
I'll try to avoid any form of active stab for that stage
--
..........................................................................
Choky
Prodanovic Aleksandar
YU
"don't use force, "don't use force,
use a larger hammer" use a larger tube
- Choky and IST"
- ZM
.............................................................................
"Ian Iveson" <IanIveson.home@blueyonder.co.uk> wrote in message
news:VRgrd.56598$F7.15855@fe1.news.blueyonder.co.uk...
| Quote: | Anyone know anything about the philosophy of music? Or HTML? I feel
about half-way there.
http://www.ivesonaudio.pwp.blueyonder.co.uk
The 6CH6 amp page looks nearly OK to me, the other amp needs writing
up, and I need help with the philosophy, or "performance" page. The
essential thesis is that music is an interactive pursuit, and so the
listener must play an active part in the performance. Somehow the
reproductionists and creationists must both be right, and the
continuing debate between the two is part of the process of music.
Placing this in the context of established thought is hard, I find.
BTW, I think I have decided to replace the input and concertina
stages of the 6CH6 amp with a direct coupled pair of LTP, using a SS
current source under the second LTP. An ECC88 and ECC82 gives me
enough gain for global nfb. What's good for dropping 100V or so at
around 10mA?
cheers, Ian
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Ian Iveson
Guest
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| Posted:
Wed Dec 01, 2004 6:12 pm Post subject:
Re: HTML Catastrophe |
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"Choky" <choky@eunet.yu> wrote
| Quote: | nice site (for start ;) - in any case better than my page(s) ,
hehe.........
for dropping-ya mean on dropping 100 V of Ub?
in that case , plain 3W 10K resistor + 47uF will do fine .
I'll try to avoid any form of active stab for that stage
|
Perhaps lifting would be a better way of putting it. For the second
LTP I want an ss current source that lifts the cathodes about 100V
at about 10mA. Obvious choice would be a pentode but no space or
socket.
Circuit would be something like
http://www.ivesonaudio.pwp.blueyonder.co.uk/cfb6cH6FB1.GIF
where the triangle is the same output stage as shown in my web
pages.
cheers, Ian |
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Tim Williams
Guest
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| Posted:
Wed Dec 01, 2004 6:12 pm Post subject:
Re: HTML Catastrophe |
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"Ian Iveson" <IanIveson.home@blueyonder.co.uk> wrote in message
news:VRgrd.56598$F7.15855@fe1.news.blueyonder.co.uk...
| Quote: | Anyone know anything about the philosophy of music? Or HTML? I feel
about half-way there.
|
I know my share of HTML. I typed my website in Notepad, anyway.
I can do a bit of philosophizing but for the most part, to me it is old men
arguing in a manner which to the ordinary layman is trancedental thought but
to one in the know, it is just what it is - arguing, a far cry from the true
persuit of knowledge which the sciences bring to someone who seeks it.
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms |
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kseely
Guest
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| Posted:
Wed Dec 01, 2004 6:13 pm Post subject:
Re: HTML Catastrophe |
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Ian Iveson wrote:
| Quote: | Anyone know anything about the philosophy of music? Or HTML? I feel
about half-way there.
http://www.ivesonaudio.pwp.blueyonder.co.uk
The 6CH6 amp page looks nearly OK to me, the other amp needs writing
up, and I need help with the philosophy, or "performance" page. The
essential thesis is that music is an interactive pursuit, and so the
listener must play an active part in the performance. Somehow the
reproductionists and creationists must both be right, and the
continuing debate between the two is part of the process of music.
Placing this in the context of established thought is hard, I find.
BTW, I think I have decided to replace the input and concertina
stages of the 6CH6 amp with a direct coupled pair of LTP, using a SS
current source under the second LTP. An ECC88 and ECC82 gives me
enough gain for global nfb. What's good for dropping 100V or so at
around 10mA?
cheers, Ian
|
I don't understand what you mean by "philosophy" here, but I like the
V-4 amp. When it clips does it make a (*smirk*) triangle wave?
Karl |
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Yves
Guest
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| Posted:
Wed Dec 01, 2004 11:57 pm Post subject:
Re: HTML Catastrophe |
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"Ian Iveson" <IanIveson.home@blueyonder.co.uk> a écrit dans le message de
news: VRgrd.56598$F7.15855@fe1.news.blueyonder.co.uk...
| Quote: | Anyone know anything about the philosophy of music? Or HTML? I feel
about half-way there.
http://www.ivesonaudio.pwp.blueyonder.co.uk
The 6CH6 amp page looks nearly OK to me, the other amp needs writing
up, and I need help with the philosophy, or "performance" page. The
essential thesis is that music is an interactive pursuit, and so the
listener must play an active part in the performance. Somehow the
reproductionists and creationists must both be right, and the
continuing debate between the two is part of the process of music.
|
WAHOU !!
So beautifull !
So instructing plate curves !
| Quote: |
Placing this in the context of established thought is hard, I find.
BTW, I think I have decided to replace the input and concertina
stages of the 6CH6 amp with a direct coupled pair of LTP, using a SS
current source under the second LTP. An ECC88 and ECC82 gives me
enough gain for global nfb. What's good for dropping 100V or so at
around 10mA?
|
MJE340, TIP50 ?
Yves.
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John Stewart
Guest
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| Posted:
Thu Dec 02, 2004 12:12 am Post subject:
Re: HTML Catastrophe |
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Ian Iveson wrote:
| Quote: | Anyone know anything about the philosophy of music? Or HTML? I feel
about half-way there.
http://www.ivesonaudio.pwp.blueyonder.co.uk
The 6CH6 amp page looks nearly OK to me, the other amp needs writing
up, and I need help with the philosophy, or "performance" page. The
essential thesis is that music is an interactive pursuit, and so the
listener must play an active part in the performance. Somehow the
reproductionists and creationists must both be right, and the
continuing debate between the two is part of the process of music.
Placing this in the context of established thought is hard, I find.
BTW, I think I have decided to replace the input and concertina
stages of the 6CH6 amp with a direct coupled pair of LTP, using a SS
current source under the second LTP. An ECC88 and ECC82 gives me
enough gain for global nfb. What's good for dropping 100V or so at
around 10mA?
cheers, Ian
|
Here is a concertina circuit that works very well. By using both
sections
of a 12AU7 paralleled as the concertina this circuit easily drives a
pair of
6L6GC's in ultralinear right up to grid current. The pot in the cathode
can
be adjusted so that even order harmonics are all but eliminated. A DC
NFB connexion from the 12AU7 cathode to the input pentode screen
stabilizes the operating points of both tubes so that while aging they
are
maintained close to optimum conditions.
I built two of these amps around 1960 & used them continuously for
more than 15 years. They are still here & I run them in the lab now
& then for experimental use.
The schema is posted a ABSE. Please excuse the hand drawing,
circa 1960 when I was not as sophisticated!! I've included as well
a note which I had posted with this same circuit some time ago.
Having recommended this circuit I have to admit that all of my more
recent work with PP amps have used a two stage diff amp as a driver.
I also always use a negative supply for the CCS since these days
that kind of thing is easy to do.
Someone suggested a cap across the 2nd stage cathode resistor.
Needless to say, that would defeat the differential function at that
point.
Cheers, John Stewart |
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Ian Iveson
Guest
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| Posted:
Thu Dec 02, 2004 5:47 am Post subject:
Re: HTML Catastrophe |
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"Yves" <y.monmagnon@wanadoo.fr> wrote
| Quote: | WAHOU !!
So beautifull !
So instructing plate curves !
|
Thanks Yves!
Some day I should do the same set of curves for a PP pair.
Ah, I have a few MJE340. Also have some mosfets from when I was
tinkering with a mu stage and didn't manage to blow them up as
usual. So little experience or theory of SS I don't know where to go
so I usually just copy stuff. Suppose I should learn...
cheers, Ian |
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Ian Iveson
Guest
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| Posted:
Thu Dec 02, 2004 5:47 am Post subject:
Re: HTML Catastrophe |
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"kseely" <kseely@gmail.com> wrote
| Quote: | I don't understand what you mean by "philosophy" here, but I like
the
V-4 amp. When it clips does it make a (*smirk*) triangle wave?
|
Questions like "what is music?" and, if music is a social process,
what is the role of a domestic audio system within that process?
What, to put it simply, are my amplifiers for?
I wonder if I can introduce the word "orthogonal" to the vocabulary
of audiofoolishness. Something to do with fields, perhaps.
Clipping is messy actually because of the combination of class A and
concertina. That's one reason why I want to change to a LTP.
cheers, Ian |
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Ian Iveson
Guest
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| Posted:
Thu Dec 02, 2004 6:10 am Post subject:
Re: HTML Catastrophe |
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"John Stewart" <jh.stewart@sympatico.ca> wrote
Thanks John! I had planned on doubling up the concertina and using
a ECC83/mosfet mu stage for the input (don't want to tangle with
small pentodes). That would avoid the extra 100V needed to jack up
the second LTP. All in all I like the cascaded LTP better though,
and I happen to have a suitable mains transformer.
I have no spare pins on the umbilical cord for a -ve supply. Is it
better to direct-couple the driver stage to the output stage, rather
than the input to the driver? With parallel output valves it is a
lot simpler to couple with caps.
What do you use as a current source for the second LTP?
cheers, Ian |
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Yves
Guest
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| Posted:
Thu Dec 02, 2004 11:35 am Post subject:
Re: HTML Catastrophe |
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"Ian Iveson" <IanIveson.home@blueyonder.co.uk> a écrit dans le message de
news: yCtrd.61100$F7.27751@fe1.news.blueyonder.co.uk...
| Quote: | "Yves" <y.monmagnon@wanadoo.fr> wrote
WAHOU !!
So beautifull !
So instructing plate curves !
Thanks Yves!
Some day I should do the same set of curves for a PP pair.
MJE340, TIP50 ?
Ah, I have a few MJE340. Also have some mosfets from when I was
tinkering with a mu stage and didn't manage to blow them up as
usual. So little experience or theory of SS I don't know where to go
so I usually just copy stuff. Suppose I should learn...
cheers, Ian
Hi Ian |
My notes at:
http://perso.wanadoo.fr/yves.monmagnon/SSCCS.GIF
Cheers, Yves. |
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RdM
Guest
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| Posted:
Thu Dec 02, 2004 11:47 am Post subject:
Re: HTML Catastrophe |
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"Tim Williams" inscribes in
rec.audio.tubes<jClrd.24$3b4.23@fe03.lga>:
: I can do a bit of philosophizing but for the most part, to me it is old men
: arguing in a manner which to the ordinary layman is trancedental thought but
: to one in the know, it is just what it is - arguing, a far cry from the true
: persuit of knowledge which the sciences bring to someone who seeks it.
:
: Tim
Philosophising, I'd think, from philosophise. There are rules for "s" and "z"
Transcendental
Pursuit.
Actually, science tends to advance by argument, does it not?
--
RdM
[NB that two hypens and a space followed by a new line denotes a sig.] |
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RdM
Guest
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| Posted:
Thu Dec 02, 2004 11:48 am Post subject:
Re: HTML Catastrophe |
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"Ian Iveson" <IanIveson.home@blueyonder.co.uk> writes:
: Anyone know anything about the philosophy of music? Or HTML? I feel
: about half-way there.
:
: http://www.ivesonaudio.pwp.blueyonder.co.uk
The 6CH6 green machine is a triumph!
: The 6CH6 amp page looks nearly OK to me, the other amp needs writing
: up, and I need help with the philosophy, or "performance" page. The
: essential thesis is that music is an interactive pursuit, and so the
: listener must play an active part in the performance. Somehow the
: reproductionists and creationists must both be right, and the
: continuing debate between the two is part of the process of music.
:
: Placing this in the context of established thought is hard, I find.
For some time now, perhaps ever since you broached this thought, I have had
in mind and been searching for an early small book, 80's, perhaps, perhaps
also Philips related, which had a speculative chapter on the future of music
reproduction, a la the usual technological future decades fantasies, because
they projected amplifier controls for all sorts of listener preferential
adjustments, colourations of all sorts, preshadowing, maybe even beyond, in
imagination, what DSP and other spatial and tonal arrangments came since.
Heh! Well, I'll still try and find it ...
<snip unanswerable>
: cheers, Ian
regards, Ross |
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RdM
Guest
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| Posted:
Thu Dec 02, 2004 12:03 pm Post subject:
Re: HTML Catastrophe |
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: : Placing this in the context of established thought is hard, I find.
:
: For some time now, perhaps ever since you broached this thought, I have had
: in mind and been searching for an early small book, 80's, perhaps, perhaps
: also Philips related, which had a speculative chapter on the future of music
: reproduction, a la the usual technological future decades fantasies, because
: they projected amplifier controls for all sorts of listener preferential
: adjustments, colourations of all sorts, preshadowing, maybe even beyond, in
: imagination, what DSP and other spatial and tonal arrangments came since.
:
: Heh! Well, I'll still try and find it ...
:
: <snip unanswerable>
:
: : cheers, Ian
:
: regards, Ross
! I meant ' 60's ... not ' 80s !
I've wanted to quote it for ages ... I know I used to have it.
There is a place where both meet, surely ... perhaps we are all but in it?
--
RdM
"Where a calculator on the ENIAC is equipped with 18,000 vacuum tubes and
weighs 30 tons, computers in the future by the year 2000, may have only
1,000 vacuum tubes and weigh only 1.5 tons"
Popular Mechanics, March 1949 |
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mick
Guest
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| Posted:
Thu Dec 02, 2004 12:09 pm Post subject:
Re: HTML Catastrophe |
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On Wed, 01 Dec 2004 10:16:21 +0000, Ian Iveson wrote:
Lovely! I really enjoyed your web page - even if you feel that it is
incomplete. That green meanie setup is excellent! The looks remind me of
steam engines & things like that... :-)
--
Mick
(no M$ software on here... :-) )
Web: http://www.nascom.info
Web: http://projectedsound.tk |
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