plasma on e-bay

inertial · 28th December 2008, 01:52 PM

Hi,

In your opinion is it a joke?

http://cgi.ebay.it/Plasma-tweeter-se...QQcmdZViewItem

Cheers,
Paolo

analog_sa · 28th December 2008, 03:52 PM

Why would it be a joke?

If everyone was using these there would be no problems with the ozone layer. (this is a joke)

inertial · 28th December 2008, 04:09 PM

bear · 28th December 2008, 11:04 PM

At least in the USA, and likely in EU, an illegal RFI generator...

Might sound ok, but it is not shielded, the plate of the tube is exposed, etc. etc.

_-_-bear

Cauhtemoc · 29th December 2008, 06:48 AM

Probably something like this:

http://www.plasmatweeter.de/eng_plasma.htm

Calvin · 29th December 2008, 08:32 AM

Hi,

well the seller won´t regard it as a joke and it might in praxi even work sufficiently, but --and this is a big but-- besides the problem bear already mentioned, there are at least two more problems.
The first is: how and how often to replace the electrode
and second: where to place the thing? Every designer of decent speakers places the drivers in close proximity to each other to cope with phase issues. The shown plasma won´t allow for this. So, independent of the sheer driver´s sound qualitity, this completely impractical design renders itself rather useless. It´s a nice gimmick for show and tell, but no serious driver for a firstclass loudspeaker....that´s all.

jauu
Calvin

Franz Gysi · 29th December 2008, 08:42 AM

I strongly recommend, to be critical reading this link mentionned above

http://www.plasmatweeter.de/eng_plasma.htm

Why?

Ulrich Haumann made a mistake by adapting the circuit from DuKane and used wrong voltages.

He has overseen that the psu from DuKane was driven by 117V and not 230V

And you can find many rebuilders, doing the same error.

O.K., the PL509 can stand the Haumann 600V, but does it sound good?

Smile
Franz

/Edit: be also critical with this original circuit: there is no tranny at the input of the psu and therefore no galvanic separation!

inertial · 29th December 2008, 09:08 AM

Quote:

Originally posted by Calvin
Hi,

and second: where to place the thing? Every designer of decent speakers places the drivers in close proximity to each other to cope with phase issues. The shown plasma won´t allow for this. So, independent of the sheer driver´s sound qualitity, this completely impractical design renders itself rather useless. It´s a nice gimmick for show and tell, but no serious driver for a firstclass loudspeaker....that´s all.

jauu
Calvin

Hi guys,
I am in total agreement here. To not talk about the diffraction effects of that "stuff" all around !

Cheers
Paolo

stokessd · 15th January 2009, 12:46 AM

From looking at the auction he has created a tweeter and toaster oven in one easy to use package.

Nobody mentioned the fact that it's a Nitrous Oxide generator too.

Sheldon

Javachip · 15th January 2009, 12:04 PM

Does "150,00 Euros" mean 150 Euros, i.e. about US$190 per tweeter? That's a lot cheaper than the Acapella or Lansche plasma tweeters, which cost many thousands of dollars per tweeter last time I checked.

28th December 2008, 01:52 PM	#1
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	plasma on e-bay Hi, In your opinion is it a joke? http://cgi.ebay.it/Plasma-tweeter-se...QQcmdZViewItem Cheers, Paolo

28th December 2008, 11:04 PM	#4
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	At least in the USA, and likely in EU, an illegal RFI generator... Might sound ok, but it is not shielded, the plate of the tube is exposed, etc. etc. _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Plasma Arc speakers	merlin2069er	Planars & Exotics	5	8th June 2009 02:49 AM
Plasma speaker	deadlyvj	Planars & Exotics	19	4th July 2008 04:42 PM
Plasma/ion tweeters	Prune	Tubes / Valves	0	16th June 2004 04:31 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

28th December 2008, 03:52 PM	#2
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Why would it be a joke? If everyone was using these there would be no problems with the ozone layer. (this is a joke)

28th December 2008, 04:09 PM	#3
inertial diyAudio Member Join Date: Aug 2004 Location: Italy

29th December 2008, 06:48 AM	#5
Cauhtemoc diyAudio Member Join Date: Jun 2007	Probably something like this: http://www.plasmatweeter.de/eng_plasma.htm

29th December 2008, 08:32 AM	#6
Calvin diyAudio Member Join Date: Nov 2004 Location: close to Basel	Hi, well the seller won´t regard it as a joke and it might in praxi even work sufficiently, but --and this is a big but-- besides the problem bear already mentioned, there are at least two more problems. The first is: how and how often to replace the electrode and second: where to place the thing? Every designer of decent speakers places the drivers in close proximity to each other to cope with phase issues. The shown plasma won´t allow for this. So, independent of the sheer driver´s sound qualitity, this completely impractical design renders itself rather useless. It´s a nice gimmick for show and tell, but no serious driver for a firstclass loudspeaker....that´s all. jauu Calvin

29th December 2008, 08:42 AM	#7
Franz Gysi diyAudio Member Join Date: Oct 2007	I strongly recommend, to be critical reading this link mentionned above http://www.plasmatweeter.de/eng_plasma.htm Why? Ulrich Haumann made a mistake by adapting the circuit from DuKane and used wrong voltages. He has overseen that the psu from DuKane was driven by 117V and not 230V And you can find many rebuilders, doing the same error. O.K., the PL509 can stand the Haumann 600V, but does it sound good? Smile Franz /Edit: be also critical with this original circuit: there is no tranny at the input of the psu and therefore no galvanic separation!

15th January 2009, 12:46 AM	#9
stokessd diyAudio Member Join Date: Nov 2002 Location: Fort Wayne, IN	From looking at the auction he has created a tweeter and toaster oven in one easy to use package. Nobody mentioned the fact that it's a Nitrous Oxide generator too. Sheldon

15th January 2009, 12:04 PM	#10
Javachip diyAudio Member Join Date: Dec 2005 Location: CA	Does "150,00 Euros" mean 150 Euros, i.e. about US$190 per tweeter? That's a lot cheaper than the Acapella or Lansche plasma tweeters, which cost many thousands of dollars per tweeter last time I checked.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)