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In the Forum: Audio Discussions
In the Thread: A quests for an ultimate preamp.
Post Subject: ...they shall not be limited by preamp’s output impedance.Posted by Romy the Cat on: 5/26/2009
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 Lbjefferies7 wrote:
Having said that, the 15 Commandments above look like a fine solution-based pre-amp...and the title reminds me of Mel Brooks as Moses.
  
Yes, it was exactly my point of reference.  
 Lbjefferies7 wrote:
A possible #16 may be an elegant way of current-loading cables.  Perhaps this should include an attenuator to achieve the proper current for a given cable?
 
The Commandments #8 implies it. The current-loading cables is not the functionality of preamps but the properly of the cable load. So, the preamp shall have very low output impedance and the output stage shall run very deep in class A1 with very hot bias, with a lot of heat sinks. The SS devices, most of them run feedback, allow to have ultra low output impedance – a few Ohms - and if the output stage do not oscillates in this operation ten it is very good. The oscillation would the property of the cable capacitance as well, so the few dozen Ohms output anti- oscillation resistor would not be a bad thing…
 
I am sure the right people who do Ultimate Preamps would do this research in SS devises and I am sure would fund the right solution. I personally would like to see the Ultimate Preamp measurements and to observe of it transparency at 50MHz. Yes you did not misread me – at 50MHz - at videos single. I would like to see a preamp made with all rules of HF transmission like with unlimited bandwidth and unlimited power (unlimited for liner level).
 
BTW, having a system configuration like mine – with multiple line level filters is very educational as the output impedance of preamp is the very essential design factor of my playback. Whatever people do they shall not be limited by preamp’s output impedance.

The Cat

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