Valvole contro transistors

[PrandiniFabio]

Grazie Ciroschi, molto interessante

[C7P8]

Salve,
riguardo al costruttore dei "grandi" preamplificatori, non credo che esista solo lui che li sa fare, io ho i due pre, costruiti da Luca Kiomenti, è
sicuramente vanno molto bene, anzi benissimo, lo disse anche il progettista della Nagra. Di luca ho anche lo scherzo, che funziona da una
quindicina di anni, e i parametri, sono sempre gli stessi. Un amico compro i tamp di plastica, e venne da me per confrontarlo con lo scherzo,
non li ha buttati ma, una lo ha dato a me, gli altri li ha regalati ad altre persone.


Con il gruppo Euterpe, abbiamo fatto vari ampli valvolari a triodo, e qualcuno a pentodo, nessuno ancora ci ha chiamato per riparazioni,
quindi, forse erano buoni.
Saluti.

Ma come? Le valvole non si sono esaurite? Non hanno ascoltato il decadimento dei tubi???

[F.Calabrese]

Ecco l'articolo di James Moir che fece da spunto a quello postato da Ciroschi, che ho spostato in questo thread per farlo rintracciare più facilmente in futuro.



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[F.Calabrese]

Ecco la Pag.2



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F.C.

[F.Calabrese]

Ecco la Pag.3



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[F.Calabrese]

Ed infine ecco la Pag.4



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Saluti
F.C.

[elettro]

Con l'inglese vado poco veloce, potrei tradurre i segnali binari degli Alieni, ma qui mi soffermo..

[queledsasol]

1978..................una vita fa................ero un ragazzuolo...................
Va be che il settore è fermo...............ma .............sono passati 40 anni........di acqua sotto i ponti....................

[oblomov]

- un' analisi sulle differenze all'ascolto fra stato solido e valvole

Tubes Vs. Transistors - Audibly Different

Russel O. Hamm Sear Sound Studios N.Y. 1973

http://milbert.com/Files/articles/TvsT/tstxt.pdf

trovato su questo...

http://www.amplimos.it/linkutili.htm

viewtopic.php?f=5&t=7727


Tubes Versus Transistors-
Is There an Audible Difference?*

RUSSELL O. HAMM

Sear Sound Studios, New York, N. Y.

Engineers and musicians have long debated the question of tube sound versus
transistor sound. Previous attempts to measure this difference have always assumed
linear operation' of the test amplifier. This conventional method of frequency re-
sponse, distortion, and noise measurement has shown that no significant difference
exists. This paper, however, points out that amplifiers are often severely overloaded
by signal transients (THD 30%). Under this condition there is a major difference
in the harmonic distortion components of the amplified signal, with tubes, transistors,
and operational amplifiers separating into distinct groups.

INTRODUCTION: As a recording engineer we became
directly involved with the tube sound versus transistor
sound controversy as it related to pop recording. The dif-
ference became markedly noticeable as more solid-state
consoles made their appearance. Of course there are so
many sound problems related to studio acoustics that
electronic problems are generally considered the least
of one's worries. After acoustically rebuilding several
studios, however, we began to question just how much of
a role acoustics played.

During one session in a studio notorious for bad sound
we plugged the microphones into Ampex portable
mixers instead of the regular console. The change in
sound quality was nothing short of incredible. All the
acoustic changes we had made in that studio never had
brought about the vast improvement in the sound that a
single change in electronics had. Over a period of sev-
eral years we continued this rather informal investiga-
tion of the electronic sound problem. In the past, we have
heard many widely varied theories that explain the prob-
lem, but no one, however, could actually measure it
in meaningful terms.

PSYCHOACOUSTICS

Anyone who listens to phonograph records closely can
tell that tubes sound different from transistors. Defin-
ing what this difference is, however, is a complex psy-
choacoustical problem. Any investigation of this admit-
tedly subtle phenomenon must really begin with a few
human observations. Some people try to point out and
describe valid differences. Others just object to the en-
tire thesis and resort to spouting opinions. It is the lis-
tener's job to sort out the facts from the fiction.

Electrical engineers, especially the ones who design
recording equipment, can prove that there is no differ-
ence in tube or transistor sound. They do this by show-
ing the latest specification sheets and quoting electronic
figures which are visually quite impressive. It is true, ac-
cording to the parameters being measured, that there is
....


* Presented September 14, 1972, at the 43 rd Conven-
tion of the Audio Engineering Society, New York.

MAY 1973, VOLUME 21, NUMBER 4

https://en.wikipedia.org/wiki/Tube_sound

ENORME bibliografia...

[mariorossi186]

Ecco l'articolo di James Moir che fece da spunto a quello postato da Ciroschi, che ho spostato in questo thread per farlo rintracciare più facilmente in futuro.



https://farm5.staticflickr.com/4595/253 ... 418c_c.jpg

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1973 / 8 ?
okay