[Patrick Turner]

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

[JohnnyCanuck]

Patrick Turner wrote:
I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html


Very impressive!

[tubegarden]

Hi RATs!

Nice stuff

Happy Ears!
Al

[Andre Jute[_2_]]

Patrick Turner wrote:

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Stunning design and craftsmanship, Patrick. I like the liberal (but
not thoughtlessly stupid) use of chokes; they're an underrated
component these days. You will not be surprised to discover I have
already downloaded your protection schematic...

There are no browsing problems but there is a formatting solecism in
that your software has added a hard break at the end of lines. Would
you like me to download that page, fix it and email it to you to post
back up?

Andre Jute
Mucho impressed

[Patrick Turner]

Andre Jute wrote:

Patrick Turner wrote:

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Stunning design and craftsmanship, Patrick. I like the liberal (but
not thoughtlessly stupid) use of chokes; they're an underrated
component these days. You will not be surprised to discover I have
already downloaded your protection schematic...

Chokes are good, no doubt about it. the alternative
woud have been more R&C sections, which I sometimes employ where
there isn't room to put a choke.

So if you have large C values, like the seriesed 470uF caps for 235uF,
it has 6.8 ohms reactance at 100 Hz. If R is 68 ohms, you have 100Hz
attenuation facto of 1/10.
3 such sections give AF = 1/1,000. so if Idc was 200mA, then Vdc drop
over 204 ohms = 40V,
and PdR = 8W, which isn't too bad, and Vripple at C3 = 1.9mV.

A choke of 4H has X = 2.5k, so one LC section after C1 has AF = 1/2,700,
so Vr = 0.7mV.
But there is an LC resonance between 4H and 235uF at 5.2Hz, and the amp
load isn't low enough
to damp it with its shunt loading across the C. So the other way to damp
it is to have
some added series R of approximately 1.4 x XL or XC at Fo, ie, 180 ohms.
The dcr of the choke is about 40 ohms, so an added 100 ohms gives a
dampiing effect to stop
LF noise from mains noise causing somewhat high undulations of the B+
centred around 5.2Hz.
Ad to assist further, I've added another R&C section of 100 ohms plus
235uF,
so the PS B+ ands B- rails are fairly quiet, and well damped against LF
transients
generated either from the damn mains or the amp itself.
Very slow frequencies in PS rails below 5Hz
are highly attenuated elsewhere in the amp circuit.



There are no browsing problems but there is a formatting solecism in
that your software has added a hard break at the end of lines. Would
you like me to download that page, fix it and email it to you to post
back up?

What is a hard break? formatting solecism?

The Mozzilla wyswyg composer does not promt you about such things, and I
just blithely
carry on ingnorantly sometimes.......

The trouble with computing is that the human cannot fully know or
remember what he's doing.

Yes, you may return a corrected version of the page, pehaps without the
images included
because of the email size.
Maybe its easier to somehow apply a simple command like "remove all hard
breaks" at this end.

BTW, KR Audio make a range of amplifiers using their own tubes.
One is a 30W + 30W integrated amp with a KRT100 tube, which is very like
the 845,
but Ra = 1.2k instead of 2.2k at the same Ea and Ia as the 845.
Biasing is about the same as the 845, and the KRT100 would work in any
circuit needing an 845
Except for one DAMN thing, the cathode heating needed is 2.5V x 2A,
which means the KRT100 is NOT
a plug in replacement for the 845.
There is one of these integrated KR 3030 amps in alocal hi-fi shop here
and the price is usd 14,400.
It will take them years to sell that amp here.
It uses a solid state input and drive amp circuit.
So it just ain't the full real Mc'coy tube amp.

However, the KRT100 will run happily at Ea = 800V, and with Ia at a safe
100mA for Pda = 80W,
and because RL could be 5.6k, then DF will be about 4 without loop FB,
and
nearly as good as an 845 with Ea = 1,050V, and RL = 12k, with DF = about
5.
The lower RL at the lower Ea means you could have a 50H choke fed anode,
and use a 50uF polypropylene
cap to couple a Hammond 1650P OPT which is rated for 6k6 : 4,8, and 16
ohms.
Ppl would not have to construct or buy a complex and expensive air
gapped OPT.

I thought of doing choke feed in my 845 amps, but chickened out in
favour
of doing things traditionally, with the only "compromise" of the split
rail
to avoid HV dc across the OPT insulations.

Prices for KR845 AND KRT100 are about usd $534 retail now from what I
see.

But availablity is whole other issue, and apparently there are no stocks
in Prague
where the KR company operates, and production of 845 is not due to
commence until October 08,
and lord only knows if any quanity will emerge.

Meanwhile, the most basic cheap version of Shuguang 845 works just fine
at less than 1/3 the KR price.

This Chinese triode seems like a faithful copy of the original US mades,
and comes without frills such a a copper base which seems to only add to
the price.

A pair of 845 used in SE parallel and Ea = about 1,000V can have a 50H
choke feed,
and have a cap coupled Hammond 1650P, OK for 60W into 6.6k, or maybe
better 1650R, rated for 100W into 5k 4,8,16 if you wish.

The 50H choke for the choke feed isn't very difficult to make.
In my OPT, only about 1/3 of the winding space in the 76mm x 25 mm
window is used for the primary wire.
That is because of the space needed for P-S insulation and the
secondaries.
The core has a 51mm tongue x 72mm stack, and if 3/4 of the winding
window was filled only with
fine wire as for a choke, there'd be about 6,000 turns, and the L value
would become huge.
Its probably better is to have two slightly smaller chokes in series to
make the Cshunt of the choke feed lower,
and the halve the ac voltages across the coils.
The chokes don't need to have GOSS, and any old lams you have laying
around or from
cooked old PT will do, and the winding need not be layer wound and can
be random wound but
using a fairly slow traversing speed to keep wire crossing angles very
shallow.
Varnish can be sprayed on from a can of clear varnish from a hardware
store
as you wind, and you don't need to count the turns, just fill the
bobbin, using about 0.45 Cu dia wire.




Patrick Turner.

Andre Jute
Mucho impressed

[Andre Jute[_2_]]

Fascinating stuff, Patrick. I had some vintage transformers once for
845 and, instead of letting them go on amps, should have saved at
least one to take apart and get copied. Water under the bridge.

****

Your formatting problem is that the hard returns at the end of lines
makes your page (and others on your site) difficult and sometimes ugly
reading unless the reader uses *exactly* the same font, font size
preferences and window width as you. That never happens, so your site
will never be pretty while you have those hard line returns. What
happens is that the paragraphs do not reformat smoothly as the window
width is made narrower. Instead you get line and a half, line and a
half and so on.

You're right, you should really learn how to do it rather than me
doing a single page for you and leaving you with the rest.

Okay. You can fix it easily in Microsoft Word or any other text
processor, using search and replace.

First, understand the structure of your page. Text is real simple. A
paragraph is two hits of the return key. A piccie fits in the middle
line of three hits of the return key. That makes for a simple, elegant
structure anyone's browser will read. There should be no other
paragraph marks, particularly not in the middle of sentences (the line-
end breaks we're trying to lose). To see paragraph marks, switch on
whatever they call Show Formatting in the text processor you use; be
sure to switch it off again when you no longer need it or you might
carry garbage into HTML and that can be hell to get rid of. (Don't try
for fancy stuff -- the ladylike elegance of my site is because I know
all the fancy stuff and save it for paying customers. At most, centre
each of your illustrations on its line, by simply selecting the Centre
picon on the formatting palette, which should automatically centre the
piccie too.

Next, protect the paragraph breaks of double paragraph marks (two hits
of the return key) by finding all double par marks (copy a set and
paste in the Find box) and replacing them with hash marks or something
else you don't use in your text.

Now find and replace all single par marks with a space (spacebar in
the Replace With box). Now you have one long piece of text with hash
marks indicating the par breaks.

Find the hash marks and Replace each one with a double hit of the
return key. Automatically, eh, with Find and Replace facility.

Manually add an additional return for each illustration and check feed
back to the HTML to check that the gubbins haven't screwed you again.

In MSW you can save web pages; make one and test it. If you just use
text from MSW, the form in which you save it may also add linespaces,
so experiment with the options before you commit to a lot of work. I
find it useful when I do that sort of editing on multiple files
(admittedly very large ones in most of my cases) to have a written
list of actions to be performed in sequence.

You will of course work in a copy, keeping an original in a safe place
lest you screw up and have to start over.

Here's the biggest tip of all: MSW will work with Find and Replace on
all open files together. You just have to select the All Open Files
tickbox in the dialogue box. So you make separate files of all the
pages you want to tidy up, close everything on your desktop, then open
only these files, and tell Word to work with all open files, and you
can reformat a lot of stuff very quickly.

Once you have a satisfactory page, save a copy under another name as a
template to save time in future.

HTH.

Andre Jute
Neddy tips from Neddy himself

On Sep 14, 2:50*am, Patrick Turner wrote:
Andre Jute wrote:

Patrick Turner wrote:

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Stunning design and craftsmanship, Patrick. I like the liberal (but
not thoughtlessly stupid) use of chokes; they're an underrated
component these days. You will not be surprised to discover I have
already downloaded your protection schematic...

Chokes are good, no doubt about it. the alternative
woud have been more R&C sections, which I sometimes employ where
there isn't room to put a choke.

So if you have large C values, like the seriesed 470uF caps for 235uF,
it has 6.8 ohms reactance at 100 Hz. If R is 68 ohms, you have 100Hz
attenuation facto of 1/10.
3 such sections give AF = 1/1,000. so if Idc was 200mA, then Vdc drop
over 204 ohms = 40V,
and PdR = 8W, which isn't too bad, and Vripple at C3 = 1.9mV.

A choke of 4H has X = 2.5k, so one LC section after C1 has AF = 1/2,700,
so Vr = 0.7mV.
But there is an LC resonance between 4H and 235uF at 5.2Hz, and the amp
load isn't low enough
to damp it with its shunt loading across the C. So the other way to damp
it is to have
some added series R of approximately 1.4 x XL or XC at Fo, ie, 180 ohms.
The dcr of the choke is about 40 ohms, so an added 100 ohms gives a
dampiing effect to stop
LF noise from mains noise causing somewhat high undulations of the B+
centred around 5.2Hz.
Ad to assist further, I've added another R&C section of 100 ohms plus
235uF,
so the PS B+ ands B- rails are fairly quiet, and well damped against LF
transients
generated either from the damn mains or the amp itself.
Very slow frequencies in PS rails below 5Hz
are highly attenuated elsewhere in the amp circuit.



There are no browsing problems but there is a formatting solecism in
that your software has added a hard break at the end of lines. Would
you like me to download that page, fix it and email it to you to post
back up?

What is a hard break? formatting solecism?

The Mozzilla wyswyg composer does not promt you about such things, and I
just blithely
carry on ingnorantly sometimes.......

The trouble with computing is that the human cannot fully know or
remember what he's doing.

Yes, you may return a corrected version of the page, pehaps without the
images included
because of the email size.
Maybe its easier to somehow apply a simple command like "remove all hard
breaks" at this end.

BTW, KR Audio make a range of amplifiers using their own tubes.
One is a 30W + 30W integrated amp with a KRT100 tube, which is very like
the 845,
but Ra = 1.2k instead of 2.2k at the same Ea and Ia as the 845.
Biasing is about the same as the 845, and the KRT100 would work in any
circuit needing an 845
Except for one DAMN thing, the cathode heating needed is 2.5V x 2A,
which means the KRT100 is NOT
a plug in replacement for the 845.
There is one of these integrated KR 3030 amps in alocal hi-fi shop here
and the price is usd 14,400.
It will take them years to sell that amp here.
It uses a solid state input and drive amp circuit.
So it just ain't the full real Mc'coy tube amp.

However, the KRT100 will run happily at Ea = 800V, and with Ia at a safe
100mA for Pda = 80W,
and because RL could be 5.6k, then DF will be about 4 without loop FB,
and
nearly as good as an 845 with Ea = 1,050V, and RL = 12k, with DF = about
5.
The lower RL at the lower Ea means you could have a 50H choke fed anode,
and use a 50uF polypropylene
cap to couple a Hammond 1650P OPT which is rated for 6k6 : 4,8, and 16
ohms.
Ppl would not have to construct or buy a complex and expensive air
gapped OPT.

I thought of doing choke feed in my 845 amps, but chickened out in
favour
of doing things traditionally, with the only "compromise" of the split
rail
to avoid HV dc across the OPT insulations.

Prices for KR845 AND KRT100 are about usd $534 retail now from what I
see.

But availablity is whole other issue, and apparently there are no stocks
in Prague
where the KR company operates, and production of 845 is not due to
commence until October 08,
and lord only knows if any quanity will emerge.

Meanwhile, the most basic cheap version of Shuguang 845 works just fine
at less than 1/3 the KR price.

This Chinese triode seems like a faithful copy of the original US mades,
and comes without frills such a a copper base which seems to only add to
the price.

A pair of 845 used in SE parallel and Ea = about 1,000V can have a 50H
choke feed,
and have a cap coupled Hammond 1650P, OK for 60W into 6.6k, or maybe
better 1650R, rated for 100W into 5k 4,8,16 if you wish.

The 50H choke for the choke feed isn't very difficult to make.
In my OPT, only about 1/3 of the winding space in the 76mm x 25 mm
window is used for the primary wire.
That is because of the space needed for P-S insulation and the
secondaries.
The core has a 51mm tongue x 72mm stack, and if 3/4 of the winding
window was filled only with
fine wire as for a choke, there'd be about 6,000 turns, and the L value
would become huge.
Its probably better is to have two slightly smaller chokes in series to
make the Cshunt of the choke feed lower,
and the halve the ac voltages across the coils.
The chokes don't need to have GOSS, and any old lams you have laying
around or from
cooked old PT will do, and the winding need not be layer wound and can
be random wound but
using a fairly slow traversing speed to keep wire crossing angles very
shallow.
Varnish can be sprayed on from a can of clear varnish from a hardware
store
as you wind, and you don't need to count the turns, just fill the
bobbin, using about 0.45 Cu dia wire.

Patrick Turner. *



Andre Jute
Mucho impressed

[Patrick Turner]

Andre Jute wrote:

Fascinating stuff, Patrick. I had some vintage transformers once for
845 and, instead of letting them go on amps, should have saved at
least one to take apart and get copied. Water under the bridge.

Vintage trannies for 845?

That'd mean they probably were for PP op.
And being vintage, expect poor bandwidth, because 100Hz to 8kHz
was thought of as good in 1940 as an industry standard in a world
when the best audio to be heard came from an AM radio during a direct
broadcast.

So let that water run free under that bridge.....


****

Your formatting problem is that the hard returns at the end of lines
makes your page (and others on your site) difficult and sometimes ugly
reading unless the reader uses *exactly* the same font, font size
preferences and window width as you. That never happens, so your site
will never be pretty while you have those hard line returns. What
happens is that the paragraphs do not reformat smoothly as the window
width is made narrower. Instead you get line and a half, line and a
half and so on.

OK, I don't have a clue how to fix that this end.
I am using Mozilla to compose pages though, wysiwyg.....



You're right, you should really learn how to do it rather than me
doing a single page for you and leaving you with the rest.

Okay. You can fix it easily in Microsoft Word or any other text
processor, using search and replace.

Gee, that's already looking like I have to walk a tightrope.......

First, understand the structure of your page. Text is real simple. A
paragraph is two hits of the return key.

I don't appear to have a key labelled "return".

I'm already lost.

A piccie fits in the middle
line of three hits of the return key. That makes for a simple, elegant
structure anyone's browser will read.

But I don't know what key you mean.

I am dumber than the most dumb when it comes to PC use
and unless someone assumes I am really dumb, as they should,
then I won't understand the advice which of course I'd like to be able
to take
to make the website more easily digestible if possible.
I have half a dozen new pages still to prepare and post up.



There should be no other
paragraph marks, particularly not in the middle of sentences (the line-
end breaks we're trying to lose). To see paragraph marks, switch on
whatever they call Show Formatting in the text processor you use; be
sure to switch it off again when you no longer need it or you might
carry garbage into HTML and that can be hell to get rid of. (Don't try
for fancy stuff -- the ladylike elegance of my site is because I know
all the fancy stuff and save it for paying customers. At most, centre
each of your illustrations on its line, by simply selecting the Centre
picon on the formatting palette, which should automatically centre the
piccie too.

I rarely ever click 'source' to see the html coding behind what appears
as I compose except perhaps to change a title of a page, because I
always
somehow cock up the addresses of images, and its always good luck that
I get a page to work when it does with images.

And I don't do this stuff all the time....so I don't get better....



Next, protect the paragraph breaks of double paragraph marks (two hits
of the return key) by finding all double par marks (copy a set and
paste in the Find box) and replacing them with hash marks or something
else you don't use in your text.

Now find and replace all single par marks with a space (spacebar in
the Replace With box). Now you have one long piece of text with hash
marks indicating the par breaks.

Find the hash marks and Replace each one with a double hit of the
return key. Automatically, eh, with Find and Replace facility.

Manually add an additional return for each illustration and check feed
back to the HTML to check that the gubbins haven't screwed you again.

In MSW you can save web pages; make one and test it. If you just use
text from MSW, the form in which you save it may also add linespaces,
so experiment with the options before you commit to a lot of work. I
find it useful when I do that sort of editing on multiple files
(admittedly very large ones in most of my cases) to have a written
list of actions to be performed in sequence.

You will of course work in a copy, keeping an original in a safe place
lest you screw up and have to start over.

Here's the biggest tip of all: MSW will work with Find and Replace on
all open files together. You just have to select the All Open Files
tickbox in the dialogue box. So you make separate files of all the
pages you want to tidy up, close everything on your desktop, then open
only these files, and tell Word to work with all open files, and you
can reformat a lot of stuff very quickly.

Once you have a satisfactory page, save a copy under another name as a
template to save time in future.

Thanks a lot for the explanation, but I don't quite get it.

Two dumb.

Maybe three dumb, and just a triodologist.



HTH.

Andre Jute
Neddy tips from Neddy himself

But Blim Bottle was none the wiser either, but there's hope,
I usually wake up before the explosion......

If I work out what the return key is, I'll be on the window ledge.
I'd still have to step out onto the wire between the me and the next
skyscraper.....

People wondered what the heck went on in my brain while designing OPT.

So did I.

I seemed to just read a few books, wind 3 of 4 trannies, test them,
and then what i read made sense with the test results, and I was away.

Well, during the last 5 years, at least two IT university students have
tried to convert what my mind
says into code, and thus build a program to design an OPT
and including the preparation of a bobbin section drawing that can be
handed to a
tradesman or tradeswoman on a winding lathe and ask "Could you have that
wound by 3pm please?"

So I finally identified all the steps of thought and choices and
considerations and checks
and tests and parameters to get from zero tranny to having something you
bolt to a chassis.
These multiple steps are listed out on my website.

But the two uni students both gave up trying to produce a working
program which tells you
a design including actual wire sizes, interleaving patterns, and
insulation thicknesses,
and allows you to change the turn ratio, load, power output max, make a
click,
and have an alternative winding design presented.


I'm getting more than 500 hits a day at my site.

I'd like to improve the way it appears though if that is easily
possible, bearing
in mind someone has to explain how extremely simply.

Maybe you or someone else knows a URL which spells it out for
complete IT idiots.

I use wysiwyg to avoid having to touch any html at all, or use any other
programs that don't assume I am a complete ****wit about the finer
points
of webpage composition.

I did try MS Front Page but found that way too hard to learn.
One of my local customers
made an attempt to prepare the last edition of my site in FP.
I didn't like it much because it made me look too slick and commercial
like so many other websites, and information-less.
My site is about information, not sales talk BS.

My pages appear OK if I browse them with Firefox or other browsers,
but not with my old Netscape 4.7 about 12 years old.

It would also be nice if I could prepare the website so that when
someone tries to download
the whole caboodle, now about 20MB, they could print it out into lord
knows how many A4 pages,
but each page looking well, and numbered, reminiscent of RDH4.
I'd like to prepare the website in hard copies as a kind of design
manual
that ppl can read in bed. Not essential though, because regardless of
format bother
I think ppl get my drift mostly.

And I have limited time.


Patrick Turner.

[Peter Wieck]

On Sep 15, 4:49*am, Patrick Turner wrote:

Patrick:

Don't sweat it. Your work speaks for itself, the pictures are
excellent, the text cohesive and comprehensive, the schematic clear -
and the work simply stunning.

As to the rest of it, Andre is jealous. And sufficiently small-minded
as to be forced to demonstrate his "superiority" with a bunch of smoke
and chaff of no actual utility to you.

Didn't the transformer remark right out of the gate give it away?

Peter Wieck
Melrose Park, PA

[Andre Jute[_2_]]

On Sep 15, 9:49 am, Patrick Turner wrote:
Andre Jute wrote:

Fascinating stuff, Patrick. I had some vintage transformers once for
845 and, instead of letting them go on amps, should have saved at
least one to take apart and get copied. Water under the bridge.

Vintage trannies for 845?

That'd mean they probably were for PP op.
And being vintage, expect poor bandwidth, because 100Hz to 8kHz
was thought of as good in 1940 as an industry standard in a world
when the best audio to be heard came from an AM radio during a direct
broadcast.

They were intended for a radio station in Berlin that was never built
because the Berlin Blockade ended. They were stranded in Ireland and
eventually came to me. I thought they sounded just fine, and so did
everyone else who heard them. What I had in mind when I said I shoulda
kept one for reverse engineering that even with your low labour rates,
it would still probably be cheaper to get one of those copied by
winders in the north who actually wind some famous transformers for
the owners of the famous names...

So let that water run free under that bridge.....

Regrets, of which men our age should probably be able to list a
truckload, are unproductive and a waste of time.

Your other minor problem, the formatting: I've sent you three files
with the formatting sorted, one in MSWord format, one in HTML (the net
language), and one as plaintext *without lines returns". If the HTML
doesn't work for you, try the plaintext and then the Word format. All
you have to do is add the graphics back and repost the page.

The RETURN key of which I speak is probably labelled ENTER on your
keyboard; it is simply the key that ends a paragraph.

Andre Jute
Boy Scout

[Jon Yaeger]

in article , Patrick Turner at
wrote on 9/13/08 1:36 AM:

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.



A masterpiece, Patrick. Brilliantly executed in all respects. BRAVO!

Jon

[Patrick Turner]

Jon Yaeger wrote:

in article , Patrick Turner at
wrote on 9/13/08 1:36 AM:

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

A masterpiece, Patrick. Brilliantly executed in all respects. BRAVO!

Jon

Thanks Jon.

I'm now slowly proceeding to include details and schematics for total or
partial
reformation in the following list of amps including...

My SEUL22W monblocs with 13E1,

ARC VT100, 8585W dual channel,
Manley Labs Snapper monos, 85W,
Jolida 502 5050W integrated,
Audion Silver Knight 25W monos with 2 x pp 300B,
CR audio Developments Woodham, 5050W integrated.

And anything else interesting I may have done in the last few years.

I have a pair of Dynaco Mk-III to totally re-wire.
I also have a old and humming VTL 4040 stero amp to fix, but I doubt it
needs a full re-wire.

Patrick Turner.

[Angus Stewart Pinkerton]

Originally Posted by Patrick Turner

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Deeply, deeply impressive design, engineering and implementation. If you really have to have a SET amplifier, this is definitely the one to have! Would it be rude to enquire how much a replica would cost, hand-crafted by your good self?

[keithr]

Patrick Turner wrote:
I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Very pretty Patrick, but 92KG weight 1224 volts on the output stage and
a 500 VA power transformer needed to get 110 watts. No wonder the world
has moved on.

Keith

[Patrick Turner]

Keithr wrote:

Patrick Turner wrote:
I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Very pretty Patrick, but 92KG weight 1224 volts on the output stage and
a 500 VA power transformer needed to get 110 watts. No wonder the world
has moved on.

Indeed, no wonder.

But there is still a demand........

Patrick Turner

Keith

[flipper]

On Sat, 13 Sep 2008 05:36:34 GMT, Patrick Turner
wrote:

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Beautiful!

I did run across a slight browsing problem, though. A blooming
hurricane.

Just got land phone service back but I'm low on battery power by now
so just a quick post.

[Patrick Turner]

Flipper wrote:

On Sat, 13 Sep 2008 05:36:34 GMT, Patrick Turner
wrote:

I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Beautiful!

I did run across a slight browsing problem, though. A blooming
hurricane.

Just got land phone service back but I'm low on battery power by now
so just a quick post.

Hope you are OK. Didn't you mean a slight breezing problem?

Patrick Turner.

[Andre Jute[_2_]]

On Sep 16, 9:42*pm, Flipper wrote:
On Sat, 13 Sep 2008 05:36:34 GMT, Patrick Turner

wrote:
I have just uploaded the page on the 845 amps I completed last month.

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Please let me know if there are any browsing problems.

Patrick Turner.

Beautiful!

I did run across a slight browsing problem, though. A blooming
hurricane.

Just got land phone service back but I'm low on battery power by now
so just a quick post.

I hope you're okay, Flipper. -- Andre Jute

[Ian Iveson]

Patrick wrote:

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Impressive engineering, Patrick. Congratulations.

One thing I would have agonised over: how did you decide
which way to run each set of bars on the cages? I would have
ended up with both, and used a mesh, because anything else
would have looked unresolved, but actually looking as an
outsider at yours, I wonder if it matters. But then it does
seem to naturally raise a question, which I suppose is what
unresolved means.

Ian

[Patrick Turner]

Ian Iveson wrote:

Patrick wrote:

I invite you all to try the link to see the amps at

http://www.turneraudio.com.au/monobloc845se55.html

Impressive engineering, Patrick. Congratulations.

One thing I would have agonised over: how did you decide
which way to run each set of bars on the cages? I would have
ended up with both, and used a mesh, because anything else
would have looked unresolved, but actually looking as an
outsider at yours, I wonder if it matters. But then it does
seem to naturally raise a question, which I suppose is what
unresolved means.

The cages over the tubes gurad them from most missles
heading their way, such as a pair of drunken yuppies
falling down on them during a Motzartian moment in lovemaking.

My style isn't all mincy pretty but industrial ruggedness.

Like 1940 stuff brought forward to 2008 but with dramatic
improvements like wide hi-fi bandwidth and very low distortion.

There are far uglier audio components around the Net
than the ones I make though.

Vertical bars on the vertical planes of the cages
mean things heading towards a tube slide downwards, and don't get caught
by a horizontal bar. And vertical bars don't get very dusty.
The cages are made using 5mm dia round steel bars and 10mm square
steel bars.
The square section is arc welded at corners, and bars
sweat soldered into neat 5mm holes in the bars.
The structure becomes integrally strong, and one top cross
bar can be unscrewed to allow easy removal of an 845
without removal of the whole cage. Its so people won't
try to remove the cages and then lose them which happens a lot.
Then tubes get broken.

Some people might remember there is a bar with a thread and
others won't so they'll do things the hard way.

I'm now working on the 845 page to make it tidier, and replacing
some bull**** in the text.

If the tubes get fed up with their yuppy owners and try to leave
they find it hard to get a grip on the vertical bars and they
just slip back into their sockets.

Patrick Turner.


Ian