Subj : Re: 3d printing
To : Moondog
From : Vk3jed
Date : Fri Sep 20 2019 08:18 pm
-=> On 09-20-19 01:29, Moondog wrote to Vk3jed <=-
Mo> Most musicians choose an amplifier not for it's accurate sound
Mo> reproduction, but for it's flawed design characteristics (harmonic
Mo> distortion, uneven frequency response.) Same goes with vintage
Mo> speakers. The only time a guitarist wants a clean amp and good speakers
That's true, and the introducton of musician's equipment into a thread that was
originally about the fidenity of recording media (vinyl and digital) really
muddied the waters, because there is a big difference between creation (where
imperfections can be part of the artistic process) and faithful reproduction of
music
Mo> is when they produce their sound before the amp via effects boards or
Mo> pedals,and want only amplification. How it was explained to me was
Mo> vacuum tubes produce warm even harmonics, while transistors produce
Mo> harsher odd harmonics. Some of this is aged information or heresay,
Mo> due to the changes over the years from germanium to silicon
Tubes have a couple of differences to transistors in practical circuits.
Firstly, for moderate power levels, tube power amplifiers are often "single
ended", which has the second harmonic as its strongest harmonic.
Transistorised amps, including MOSFETs are usually configured as a
complementary pair, which tends to cancel out even harmonics. Not the best for
musicians, who want those even harmonics. Tube aplifiers also almost aways
have transformer coupled outputs, which are another source of distortion (for
better or worse), due to their iron core. Modern (hi fi) amps are generally DC
coupled to the speakers.
Mo> transistors, and CMOS JFETS have been observed behaving harmonically
Mo> similar to vacumm tubes. Even among basic bulk components such as op
Mo> amps there are folks who swear one vendor's version of the same chip
Mo> sounds way better even though their specs are slightly different.
It also depends on the exact circuit design used.
... Dachshund kennel ad: Get a long little doggie.
--- MultiMail/Win v0.51
� Synchronet � Freeway BBS, Bendigo Australia. freeway.apana.org.au
