Best Valve pre-amp match for ME 550 amp - Page 15

TigerScent · 18th January 2013, 04:35 AM

Quote:

Originally Posted by VaNarn

Douglas Self has discussed the effects of source resistance in ''Electronics World" of May 2003 and that article provides useful information on the subject.

Do you have a link to this article? or a pdf you can upload?

TigerScent · 05:22 AM

...am I reading correctly? Did he say below 1 ohm?

"The frequency response is nearly flat, it doesn't matter if the load is 150 or 32 ohm, the internal resistance is below 1 ohm, the THD are typically for a tube with a lot of second harmonics (K2). They only rise over 5 % even at the output's limit, and below this threshold they decrease linear below 0.1 %."

If that is correct, then surely this would be perfectly matched to the ME550...with regards to impedance.

...but then again, he does say min output impedance = 32 ohms. Still, its pretty low...

Mini Dual Tube Headphone Amp "Blue Velvet" Edition from Mr Nixie | eBay

TigerScent · 18th January 2013, 06:51 AM

Well, I just received the Jadis PCB from Analog Metric, lightning fast --- and I must say I am totally impressed with the quality...It is at least 2mm thick if not more, the tracks are all covered nicely, and there is provision for varying sizes of components --- all nicely tinned etc...

It feels like quite a quality PCB. I have not seen one this well made ever...

Dik Dolan · 18th January 2013, 08:40 AM

The World Designs pre3 kit has an output impedance of about 10ohms, and balanced outputs as an option.
World Designs Preamplifiers

My connection with them is only as a customer (of both the pre3 and phono3 kits) and occasional poster on their forum.

TigerScent · 10:13 AM

Quote:

Originally Posted by Dik Dolan

The World Designs pre3 kit has an output impedance of about 10ohms, and balanced outputs as an option.
World Designs Preamplifiers

My connection with them is only as a customer (of both the pre3 and phono3 kits) and occasional poster on their forum.

Ahhhh, thanks for that Dik ... looks like a super unit ... Of course there is a valve solution ...

I just discovered that leaving my valve Matisse pre-amp with ME550 amp 'on' for a couple of hours, warming up --- sounds like a live performance --- quite moving --- listening to a CD of Brooke Fraser 'Flags" --- sensational --- absolutely moving !!! How much better would a impedance matched valve pre-amp sound then.

lordearl · 18th January 2013, 10:45 AM

No preamp would be even better!!

TigerScent · 18th January 2013, 11:02 AM

Quote:

Originally Posted by lordearl

No preamp would be even better!!

'trolling' again are we !!

lordearl · 18th January 2013, 11:06 AM

Quote:

Originally Posted by TigerScent

'trolling' again are we !!

??

Read the earlier posts from other members...you need a wire only.

TigerScent · 11:43 AM

Quote:

Originally Posted by lordearl

??

Read the earlier posts from other members...you need a wire only.

No volume control nor variable output - explain your statement

TigerScent · 18th January 2013, 12:30 PM

"...The real pleasure in working with a tube preamp is the sound. Not the sound that comes from a carefully tuned amplifier with perfect input levels and no measurable output distortion — for that, you’d be better off with a solid-state amp. Where a tube amplifier comes to life is when the signal from a guitar or other instrument is heavily distorted – approaching 30% total harmonic distortion or more. Whereas solid-state amps sound harsh when driven to this level of distortion, tube amps have a ‘warm’ sound that’s impossible to exactly replicate with modern electronics. I have a couple solid-state modeling amps that come close to the tube sound, but in a side-by-side experiment, there’s no question that the tube amp provides the best sound. If you’re into bass or guitar and searching for your tone, you’ll more likely find it in a tube amp than in a more technologically sophisticated (and typically cheaper) solid-state amp."

Nuts And Volts

18th January 2013, 05:18 AM	#142
TigerScent diyAudio Member Join Date: Mar 2006 Location: Australia	...am I reading correctly? Did he say below 1 ohm? "The frequency response is nearly flat, it doesn't matter if the load is 150 or 32 ohm, the internal resistance is below 1 ohm, the THD are typically for a tube with a lot of second harmonics (K2). They only rise over 5 % even at the output's limit, and below this threshold they decrease linear below 0.1 %." If that is correct, then surely this would be perfectly matched to the ME550...with regards to impedance. ...but then again, he does say min output impedance = 32 ohms. Still, its pretty low... Mini Dual Tube Headphone Amp "Blue Velvet" Edition from Mr Nixie \| eBay Last edited by TigerScent; 18th January 2013 at 05:22 AM.

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
Best type of pre-amp for valve/tube power amp	elgee	Tubes / Valves	10	11th November 2011 10:40 AM
any advice on how to match a headphone level output to valve amp input levels?	mondogenerator	Headphone Systems	1	18th December 2009 03:08 AM
what guideline to match pre and amp?	milen007	Tubes / Valves	5	2nd June 2008 05:58 AM
Valve Pre Amp & Class D Power Amp	Puffin	Tubes / Valves	7	16th June 2006 04:41 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

18th January 2013, 06:51 AM	#143
TigerScent diyAudio Member Join Date: Mar 2006 Location: Australia	Well, I just received the Jadis PCB from Analog Metric, lightning fast --- and I must say I am totally impressed with the quality...It is at least 2mm thick if not more, the tracks are all covered nicely, and there is provision for varying sizes of components --- all nicely tinned etc... It feels like quite a quality PCB. I have not seen one this well made ever...

18th January 2013, 08:40 AM	#144
Dik Dolan diyAudio Member Join Date: Sep 2004 Location: England	The World Designs pre3 kit has an output impedance of about 10ohms, and balanced outputs as an option. World Designs Preamplifiers My connection with them is only as a customer (of both the pre3 and phono3 kits) and occasional poster on their forum.

18th January 2013, 10:45 AM	#146
lordearl diyAudio Member Join Date: Jun 2007	No preamp would be even better!!

18th January 2013, 12:30 PM	#150
TigerScent diyAudio Member Join Date: Mar 2006 Location: Australia	"...The real pleasure in working with a tube preamp is the sound. Not the sound that comes from a carefully tuned amplifier with perfect input levels and no measurable output distortion — for that, you’d be better off with a solid-state amp. Where a tube amplifier comes to life is when the signal from a guitar or other instrument is heavily distorted – approaching 30% total harmonic distortion or more. Whereas solid-state amps sound harsh when driven to this level of distortion, tube amps have a ‘warm’ sound that’s impossible to exactly replicate with modern electronics. I have a couple solid-state modeling amps that come close to the tube sound, but in a side-by-side experiment, there’s no question that the tube amp provides the best sound. If you’re into bass or guitar and searching for your tone, you’ll more likely find it in a tube amp than in a more technologically sophisticated (and typically cheaper) solid-state amp." Nuts And Volts