Re: Tube/Valve Amp Noise

"Patrick Turner" <info@[EMAIL PROTECTED]
> wrote in message 
news:47DD0B84.E12FE8B9@[EMAIL PROTECTED]
>

<SNIP>
>
> More about noise and its causes is in RDH4, and because j-fets were not
> invented in 1953
> when RDH4 was being written, I suggest interested ppl search on the net
> and read many books to put themselves
> in touch with what makes a quiet preamp.

**Thanks for all that, Patrick. As always, very interesting. Just a minor 
nit-pick though. FETs have actually been around for a long time. A very
long 
time. Here's a few patent references:

http://v3.espacenet.com/origdoc?DB=EPODOC&IDX=US1745175&RPN=CA272437&DOC=ca9239e0872ee7a55e19d3915900a7771e

http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=GB439457

Of course, neither device was commercially available. Imagine if people
had 
paid attention to this technology back in the 1930s. Having said all that,

practical FETs did not arrive until around 1958. Long after RDH4 was 
written.

Trevor Wilson