Re: Tube/Valve Amp Noise

"flipper" <flipper@[EMAIL PROTECTED]
> wrote in message 
news:u5rrt3psv46d3ktj266eu75kgvqqth9kb8@[EMAIL PROTECTED]
> On Mon, 17 Mar 2008 07:19:59 +1100, "Trevor Wilson"
> <trevor@[EMAIL PROTECTED]
> wrote:
>
>>
>>"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.
>
> Lilienfeld's FET is not a jFET.
>
>> 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.
>
> There was the not entirely trivial problem of being unable to make
> them.
>
> As the story goes, Shockley was unsuccessfully trying to make a field
> effect device (FET) like Lilienfeld's and, in investigating the
> problem, Bardeen and Brattain stumbled upon the point-contact bipolar
> transistor.
>
> You have a similar 'theory' vs 'make it' problem with lasers, the
> basic theory stemming from Einstein in 1917 but it took till 1960 for
> the first ruby laser to work. And Gabor developed the theory of
> holography in 1948, over a decade before there was a laser to make one
> with.

**You're wrong. I saw a MacGyver episode which clearly showed a practical,

working laser, from the 4th or 5th century.

:-)

Trevor Wilson