View Single Post
  #10   Report Post  
Posted to rec.audio.pro
Scott Dorsey Scott Dorsey is offline
external usenet poster
 
Posts: 16,853
Default Simple Test Circuit for Tube Noise

Mark wrote:

true enough,

but if you put an equal amount of effort into the design and impedance
using a low noise FET, it will beat the tube hands down...


Not really. There's a really nice paper from Marshall Leach on the subject,
too. It's probably referenced on his website.

Tubes and FETs come out about neck and neck, with similar transformers.
Transformerless bipolar input stage comes out hands down, though, assuming
600 ohm source impedance.

That said, Fred Forssell makes a transformerless tube preamp that really
is shockingly quiet. It's not as quiet as the Great River or the Millennia
Media, but it's way more quiet than it has any right to be.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."