Discussion:
OT: diamond making machine for 200,000 dollars on alibaba
(too old to reply)
Jan Panteltje
2024-09-11 05:36:05 UTC
Permalink
Diamond making machine for 200,000 dollars on alibaba:
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-making-machine-for-200000-on-alibaba/

Now there is a profit opportunity:-)
Cursitor Doom
2024-09-11 10:21:09 UTC
Permalink
Post by Jan Panteltje
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-making-
machine-for-200000-on-alibaba/
Post by Jan Panteltje
Now there is a profit opportunity:-)
It's amazing there's still a market for diamonds at all now this is
possible.
Jan Panteltje
2024-09-11 11:48:57 UTC
Permalink
On a sunny day (Wed, 11 Sep 2024 10:21:09 -0000 (UTC)) it happened Cursitor
Post by Jan Panteltje
Post by Jan Panteltje
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-making-
machine-for-200000-on-alibaba/
Post by Jan Panteltje
Now there is a profit opportunity:-)
It's amazing there's still a market for diamonds at all now this is
possible.
Old record players used diamond needles, I have read vinyl is 'in' again these days
Audiophiles will pay big money for superior sound.
Liz Tuddenham
2024-09-11 13:11:07 UTC
Permalink
Post by Jan Panteltje
On a sunny day (Wed, 11 Sep 2024 10:21:09 -0000 (UTC)) it happened Cursitor
Post by Jan Panteltje
Post by Jan Panteltje
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-making-
machine-for-200000-on-alibaba/
Post by Jan Panteltje
Now there is a profit opportunity:-)
It's amazing there's still a market for diamonds at all now this is
possible.
Old record players used diamond needles, I have read vinyl is 'in' again
these days Audiophiles will pay big money for superior sound.
The cost of a replacement stylus is in the manufacturing, not the
materials. There are brand-new mass-produced styli for microgroove
records available at around 30 UKP - but I've just paid over 90 UKP for
a specialised one for 78s. For an even more specialised L.P. profile I
was quoted 120 UKP.
--
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
Cursitor Doom
2024-09-11 17:02:23 UTC
Permalink
Post by Liz Tuddenham
Post by Jan Panteltje
On a sunny day (Wed, 11 Sep 2024 10:21:09 -0000 (UTC)) it happened
Post by Jan Panteltje
Post by Jan Panteltje
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-
making-
Post by Liz Tuddenham
Post by Jan Panteltje
Post by Jan Panteltje
machine-for-200000-on-alibaba/
Post by Jan Panteltje
Now there is a profit opportunity:-)
It's amazing there's still a market for diamonds at all now this is
possible.
Old record players used diamond needles, I have read vinyl is 'in'
again these days Audiophiles will pay big money for superior sound.
The cost of a replacement stylus is in the manufacturing, not the
materials. There are brand-new mass-produced styli for microgroove
records available at around 30 UKP - but I've just paid over 90 UKP for
a specialised one for 78s. For an even more specialised L.P. profile I
was quoted 120 UKP.
Liz, can you recommend any genuinely good, high quality stylus/cartridge
manufacturers in Yurp currently? Preferably English or Scandinavian?
Liz Tuddenham
2024-09-11 19:07:54 UTC
Permalink
Post by Jan Panteltje
Post by Liz Tuddenham
Post by Jan Panteltje
On a sunny day (Wed, 11 Sep 2024 10:21:09 -0000 (UTC)) it happened
Post by Jan Panteltje
Post by Jan Panteltje
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-
making-
Post by Liz Tuddenham
Post by Jan Panteltje
Post by Jan Panteltje
machine-for-200000-on-alibaba/
Post by Jan Panteltje
Now there is a profit opportunity:-)
It's amazing there's still a market for diamonds at all now this is
possible.
Old record players used diamond needles, I have read vinyl is 'in'
again these days Audiophiles will pay big money for superior sound.
The cost of a replacement stylus is in the manufacturing, not the
materials. There are brand-new mass-produced styli for microgroove
records available at around 30 UKP - but I've just paid over 90 UKP for
a specialised one for 78s. For an even more specialised L.P. profile I
was quoted 120 UKP.
Liz, can you recommend any genuinely good, high quality stylus/cartridge
manufacturers in Yurp currently? Preferably English or Scandinavian?
I don't really know much about the esoteric end of the L.P. market, but
a good general-purpose workhorse would be something from the Shure 75 or
44 range (but they are American). The person to ask is Paul Hodgson of
Expert Stylys Co. but his prices are not cheap as the styli are made
individually on the premises.

You need to consider the sort of record you intend to play, presumably
you are thinking of microgroove, not coarse-grooved 78s, or similar?
For older records and those with damage, a conical stylus might pick up
less noise than a top-of-the-range elliptical or similar. Some high-end
styli are very fragile, so they might be damaged more easily.

A friend who works at the very top of the transcription business uses a
moving coil cartridge by Wilson Benesch, which is hand-made in the UK
and claims to give the ultimate in performance. It needs a special
pre-pre amplifier as the impedance is less than 30 ohms and the output
voltage would be down in the noise level of a moving-magnet
pre-amplifier. He keeps it for only the highest quality work and uses
a Shure 44 for the 'ordinary' jobs.

Elliptical styli will only give the best performance if they are angled
correctly to the .line of the groove; despite all the hype, there is no
radial pickup arm that achieves this, so a parallel-tracker is an
absolute 'must' (especially if you are using some types of analogue
de-clickers).
--
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
Cursitor Doom
2024-09-11 22:18:07 UTC
Permalink
Post by Liz Tuddenham
Post by Jan Panteltje
Post by Liz Tuddenham
Post by Jan Panteltje
On a sunny day (Wed, 11 Sep 2024 10:21:09 -0000 (UTC)) it happened
Post by Jan Panteltje
Post by Jan Panteltje
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-
making-
Post by Liz Tuddenham
Post by Jan Panteltje
Post by Jan Panteltje
machine-for-200000-on-alibaba/
Post by Jan Panteltje
Now there is a profit opportunity:-)
It's amazing there's still a market for diamonds at all now this is
possible.
Old record players used diamond needles, I have read vinyl is 'in'
again these days Audiophiles will pay big money for superior sound.
The cost of a replacement stylus is in the manufacturing, not the
materials. There are brand-new mass-produced styli for microgroove
records available at around 30 UKP - but I've just paid over 90 UKP
for a specialised one for 78s. For an even more specialised L.P.
profile I was quoted 120 UKP.
Liz, can you recommend any genuinely good, high quality
stylus/cartridge manufacturers in Yurp currently? Preferably English or
Scandinavian?
I don't really know much about the esoteric end of the L.P. market, but
a good general-purpose workhorse would be something from the Shure 75 or
44 range (but they are American). The person to ask is Paul Hodgson of
Expert Stylys Co. but his prices are not cheap as the styli are made
individually on the premises.
Excellent; many thanks.
Cursitor Doom
2024-09-11 16:59:15 UTC
Permalink
Post by Jan Panteltje
On a sunny day (Wed, 11 Sep 2024 10:21:09 -0000 (UTC)) it happened
Post by Jan Panteltje
Post by Jan Panteltje
https://arstechnica.com/science/2024/09/you-can-buy-a-diamond-making-
machine-for-200000-on-alibaba/
Post by Jan Panteltje
Now there is a profit opportunity:-)
It's amazing there's still a market for diamonds at all now this is
possible.
Old record players used diamond needles, I have read vinyl is 'in' again
these days Audiophiles will pay big money for superior sound.
They had no choice. That was back in the days when natural diamonds were
the only game in town, De Beers controlled the price of these gems and
only Superman could make them artificially (from lumps of coal IIRC).
Ralph Mowery
2024-09-11 20:52:12 UTC
Permalink
In article <vbsi92$3n5bv$***@dont-email.me>, ***@notformail.com
says...
Post by Cursitor Doom
Post by Jan Panteltje
Old record players used diamond needles, I have read vinyl is 'in' again
these days Audiophiles will pay big money for superior sound.
They had no choice. That was back in the days when natural diamonds were
the only game in town, De Beers controlled the price of these gems and
only Superman could make them artificially (from lumps of coal IIRC).
Audiophiles will pay big money for stupid things. Best example I have
seen is they will pay around $ 100 for about 6 feet of some special wire
to go from the eqipment to the AC receptical. Little good that does
when there is 20 to 50 feet of cheap copper or even aluminum cable from
there to the breaker box and other junk cable back to the power pole.

Not sure about the diamonds usen in the record players but industrial
diamonds aver vey cheap. It is just the stuff they can sell to women
that they get a large amount of money for. Had it not been for them to
convience women they needed them they would still be very cheap cmpaired
to what they are now.
Cursitor Doom
2024-09-11 22:04:38 UTC
Permalink
Post by Ralph Mowery
says...
Post by Cursitor Doom
Post by Jan Panteltje
Old record players used diamond needles, I have read vinyl is 'in'
again these days Audiophiles will pay big money for superior sound.
They had no choice. That was back in the days when natural diamonds
were the only game in town, De Beers controlled the price of these gems
and only Superman could make them artificially (from lumps of coal
IIRC).
Audiophiles will pay big money for stupid things. Best example I have
seen is they will pay around $ 100 for about 6 feet of some special wire
to go from the eqipment to the AC receptical. Little good that does
when there is 20 to 50 feet of cheap copper or even aluminum cable from
there to the breaker box and other junk cable back to the power pole.
Very true. Likewise speaker cable. I managed to get *very* many yards of
excellent low-loss 50 ohm millimetre wave coax cable at a very reasonable
price from some audiophool who'd been using it as speaker cable. He must
have had incredible hearing, that guy. ;->
Post by Ralph Mowery
Not sure about the diamonds usen in the record players but industrial
diamonds aver vey cheap. It is just the stuff they can sell to women
that they get a large amount of money for. Had it not been for them to
convience women they needed them they would still be very cheap cmpaired
to what they are now.
Also very true!
Liz Tuddenham
2024-09-12 12:21:01 UTC
Permalink
[...]
Post by Cursitor Doom
Post by Ralph Mowery
Audiophiles will pay big money for stupid things. Best example I have
seen is they will pay around $ 100 for about 6 feet of some special wire
to go from the eqipment to the AC receptical. Little good that does
when there is 20 to 50 feet of cheap copper or even aluminum cable from
there to the breaker box and other junk cable back to the power pole.
Very true. Likewise speaker cable. I managed to get *very* many yards of
excellent low-loss 50 ohm millimetre wave coax cable at a very reasonable
price from some audiophool who'd been using it as speaker cable. He must
have had incredible hearing, that guy. ;->
The business of speaker cables sounding different may have had some
passing acquaintance with the truth. Apparently the crossover networks
in loudspeaker assemblies can present the amplifier with zero impedance
under certain circumstances and may even try to feed stored energy back
into it.

Under those conditions it wouldn't be surprising if the impedance of the
cables and the current-limiting behaviour of the amplifier output stage
produced audible differences, even thouigh tests under 'normal'
conditions, with resistive dummy loads, failed to find any difference.

The cheapest answer is to have a separate amplifier for each loudspeaker
drive unit and do the crossover with active filters ahead of the power
stages. With amplifier chips being fairly cheap,it is easy to build
them into the speaker enclosures. For even better results, tailor the
frequency response of each amplifier to suit the particular drive unit
and cabinet.

The only disadvantages of this method are the need to distribute the
signal at low level and to have a power supply to each loudspeaker box.
--
~ Liz Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk
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