From rafael2pop@yahoo.com.ar Wed Apr 05 17:44:16 2006
Subject:Re: Hypothetically....

Hi Bruce,

I got amazed with your response as changed almost my
overall concept about warmth (sweeteness ?) of tubes ,
unless to get better powered sound for sampled sounds
(or modeled clones) thru MIDI keyboards

I got a technical paper from a site not far from my
house :)

This link went from the 1st page googling result,
search by "MOSFET versus TUBE".

http://www.vn-amps.com.ar/tubes_e.htm

(English text version)

I will reconsider MOSFET again for bass frequencies,
to get enough power to drive my home made woofer
speaker.

Seems a good new that MOSFET results should be the
same or yet with better "warmth" for the bass side of
the equation, furthermore when power is needed to feed
a hungry Eminence 15"

********************************

Here the partial content of the above link:

http://www.vn-amps.com.ar/tubes_e.htm

TUBES and MOSFET's has very similar curves
characteristics, in particular if we compares TUBE's
in pentode configuration with the called
"depletion mode MOSFET".

***There are more similitude between MOSFET's and
TUBE's than MOSFET's and BJT's***

MOSFET advantage TUBES in all aspects:

-Very higher transconductance (two magnitude order,
typically 3,5 mhos)

-Direct load coupling (transformless) this mean higher
bandwidth, less distortion, more damping factor.

-Better gain bandwidth product.

-Power bandwith one magnitude order higher than TUBES.

-Easy paralleling.

http://www.vn-amps.com.ar/paper_e.htm

Later this paper was a base to a postgraduate course
in the Communication Society of Argentine IEEE (1992)

**************************

Guess that overdrive should be an issue for many
clonewheelers , i.e. those "á la Jon Lord"

In my case as distortion is not crucial (mainly R&B)
have more reasons to take advantage of the great
amount of power available on the MOSFET side without
sacrificing "warmth".

Regards,

Rafael

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