The indispensible Phil Allison tells us:

*******
The Quad ESL57 input transformer has an overall turns ratio of 292:1.

The bias voltage on the bass panels is 6.2kV and they require 18 kV
volts
p-p of audio to reach full output.

The bias voltage on the mid/high panel is 1.5 kV and requires 6 kV p-p
of
audio to reach full output.

The Quad ESL63 has a bias voltage of 5.2 kV on the panels and requires
16 kV
p-p of audio to reach full output.


To achieve this feat:

The ESL57 uses a single, modest size, C-core transformer to provide the
two
levels of audio drive.

The ESL63 uses a pair of modest size, C- core transformers to provide
the
audio drive.

*********

These are born-dangerous truth-telling loudspeakers of very great
refinement. But behind the engaging smile, it's all high tension! I am
proud to own Quad speakers. I have never heard another speaker that
gives so much longterm satisfaction.

Andre Jute
Visit Jute on Amps at http://members.lycos.co.uk/fiultra/
"wonderfully well written and reasoned information
for the tube audio constructor"
John Broskie TubeCAD & GlassWare
"an unbelievably comprehensive web site
containing vital gems of wisdom"
Stuart Perry Hi-Fi News & Record Review

Andrew Jute McCoy exuded:

stuff on Quads.

Yes, and? You do this to see your pseudonym on the screen? This reminds
me of the scene in Alice, where the jurors are writing their names lest
they forget them by the end of the trial...

It is not certain what Mr. McCoy is, or what it believes its name to
be, so a little self-supplied reassurance must be critical to the
maintenance of its fantasies.

Peter Wieck
Wyncote, PA

Worthless Wiecky whined:

stuff on Quads.

Yes, and?

Jute did not say the words you falsely attribute to him, Worthless.

What's your latest plot with Lyin' Bwian? Are you going to abet his
conspiracies to rip people off, or are you satisfied with indulging his
insatiable desire to slander and calumniate?




--
A day without Krooger is like a day without radiation poisoning.

George M. Middius wrote:

Jute did not say the words you falsely attribute to him.

McCoy seldom "says" much at all, twit. But its pseudopods sure are
working overtime. You are one ignorant bit of snot, aren't you?

Peter Wieck
Wyncote, PA

Worthless Wiecky learns how to include quoted text in his ****-missives.

Jute did not say the words you falsely attribute to him.

McCoy seldom "says" much

One step at a time, even for a psychopath like you, Worthless.

BTW, how do you justify collaborating with Bwian McFraudster while setting
yourself up as an arbiter of morality? Aside from your obvious mental
illness, of course.





--
A day without Krooger is like a day without radiation poisoning.

Andre Jute wrote:


These are born-dangerous truth-telling loudspeakers of very great
refinement.

This week's winner on "State the bleeding obvious" is.....

Roy.

Andre Jute wrote:
The indispensible Phil Allison tells us:

*******
The Quad ESL57 input transformer has an overall turns ratio of 292:1.

The bias voltage on the bass panels is 6.2kV and they require 18 kV
volts
p-p of audio to reach full output.

The bias voltage on the mid/high panel is 1.5 kV and requires 6 kV p-p
of
audio to reach full output.

The Quad ESL63 has a bias voltage of 5.2 kV on the panels and requires
16 kV
p-p of audio to reach full output.

I doubt that Phil ever told such a whopper.
The audio voltage never exceeds the diaphragm voltage.

--
Eiron

No good deed ever goes unpunished.

"Eiron" wrote in message
...
Andre Jute wrote:
The indispensible Phil Allison tells us:

*******
The Quad ESL57 input transformer has an overall turns ratio of 292:1.

The bias voltage on the bass panels is 6.2kV and they require 18 kV
volts
p-p of audio to reach full output.

The bias voltage on the mid/high panel is 1.5 kV and requires 6 kV p-p
of
audio to reach full output.

The Quad ESL63 has a bias voltage of 5.2 kV on the panels and requires
16 kV
p-p of audio to reach full output.

I doubt that Phil ever told such a whopper.
The audio voltage never exceeds the diaphragm voltage.

Exception:

http://sound.westhost.com/project105.htm

polarization is speced at 1.5 KV, and maximum drive is 2.5 KV RMS

Other authority:

http://www.geocities.com/quad_esl63/...atic/esl63.jpg

Gives the power supply voltage as 5.25 KV.


The turns ratio of ESL speakers is usually in the 80-100:1 range. The
maximum RMS input of the ESL-63 is given by some as 10 volts RMS. This would
lead to no more than about 1 KV.

"Arny Krueger"
Andre Jute wrote:
The indispensible Phil Allison tells us:

*******
The Quad ESL57 input transformer has an overall turns ratio of 292:1.

The bias voltage on the bass panels is 6.2kV and they require 18 kV
volts p-p of audio to reach full output.

The bias voltage on the mid/high panel is 1.5 kV and requires 6 kV p-p
of audio to reach full output.

The Quad ESL63 has a bias voltage of 5.2 kV on the panels and requires
16 kV p-p of audio to reach full output.

I doubt that Phil ever told such a whopper.
The audio voltage never exceeds the diaphragm voltage.

Exception:

http://sound.westhost.com/project105.htm

polarization is speced at 1.5 KV, and maximum drive is 2.5 KV RMS


** Actually, the page says 3kV rms max. This is due soley to the cheap
transformer used - apparaently it's a 100 volt line tranny for PA systems.


The turns ratio of ESL speakers is usually in the 80-100:1 range. The
maximum RMS input of the ESL-63 is given by some as 10 volts RMS. This
would lead to no more than about 1 KV.


** More complete ******** from Arny.

Here are the FACTS:

The "Instruction Book" says the ESL63 is designed to work with amplifiers
of 100 watts per channel at 8 ohms - eg the Quad 405 ( I have a copy in
front of me). Such an amp can deliver 28.3 volts rms or 40 volts peak
(undistorted) to the speaker.

The published specs for "Maximum Input" a

" Continuous input ( sine wave) voltage 10 V rms

Programme peak for undistorted output 40 V

Permitted peak input 55 V "


The ESL 63 has TWO input transformers with primaries in parallel and
secondaries in series with the centre connected to speaker ground. Each
transformer has a turns ratio of 94:1 - ie when driven with 1 volt rms
the output is 94 volts rms.

This makes the overall ratio 188 : 1 - see schematic:

http://www.quadesl.com/schematics/quad63_schematic.gif


Now, 28.3 times 188 = 5,320 volts rms

(= the max drive voltage to all sections of the speaker)

5320 volts rms = 15 kV p-p.

QED.




........ Phil

Phil Allison wrote:

"Arny Krueger"

Andre Jute wrote:

The indispensible Phil Allison tells us:

*******
The Quad ESL57 input transformer has an overall turns ratio of 292:1.

The bias voltage on the bass panels is 6.2kV and they require 18 kV
volts p-p of audio to reach full output.

The bias voltage on the mid/high panel is 1.5 kV and requires 6 kV p-p
of audio to reach full output.

The Quad ESL63 has a bias voltage of 5.2 kV on the panels and requires
16 kV p-p of audio to reach full output.

I doubt that Phil ever told such a whopper.
The audio voltage never exceeds the diaphragm voltage.

Exception:

http://sound.westhost.com/project105.htm

polarization is speced at 1.5 KV, and maximum drive is 2.5 KV RMS



** Actually, the page says 3kV rms max. This is due soley to the cheap
transformer used - apparaently it's a 100 volt line tranny for PA systems.



The turns ratio of ESL speakers is usually in the 80-100:1 range. The
maximum RMS input of the ESL-63 is given by some as 10 volts RMS. This
would lead to no more than about 1 KV.



** More complete ******** from Arny.

Here are the FACTS:

The "Instruction Book" says the ESL63 is designed to work with amplifiers
of 100 watts per channel at 8 ohms - eg the Quad 405 ( I have a copy in
front of me). Such an amp can deliver 28.3 volts rms or 40 volts peak
(undistorted) to the speaker.

The published specs for "Maximum Input" a

" Continuous input ( sine wave) voltage 10 V rms

Programme peak for undistorted output 40 V

Permitted peak input 55 V "


The ESL 63 has TWO input transformers with primaries in parallel and
secondaries in series with the centre connected to speaker ground. Each
transformer has a turns ratio of 94:1 - ie when driven with 1 volt rms
the output is 94 volts rms.

This makes the overall ratio 188 : 1 - see schematic:

http://www.quadesl.com/schematics/quad63_schematic.gif


Now, 28.3 times 188 = 5,320 volts rms

(= the max drive voltage to all sections of the speaker)

5320 volts rms = 15 kV p-p.

QED.

So Andre was repeating Phil's error without correcting it.

In Phil's descrption of the ESL63 above, one transformer drives each plate.
So with "Programme peak for undistorted output 40 V", which is 28.3v RMS,
each plate gets 2657v RMS or 3760V peak, relative to ground, which is less than
the diaphragm's HT voltage of 5250v. QED again!

As the two plates are in antiphase, you could claim a peak-to-peak
plate-to-plate voltage of 7520v but there is no excuse for doubling it again.

And while looking at quad63_schematic.gif, check out the zener voltage D40-D71.

--
Eiron

No good deed ever goes unpunished.