Subj : Re: 3d printing
To : Vk3jed
From : Moondog
Date : Sat Sep 21 2019 12:43 am
Re: Re: 3d printing
By: Vk3jed to Moondog on Fri Sep 20 2019 08:18 pm
> 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
> musicians, who want those even harmonics. Tube aplifiers also almost aways
> have transformer coupled outputs, which are another source of distortion (fo
> better or worse), due to their iron core. Modern (hi fi) amps are generally
> 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.
Speaking of high end audio, I remember a challenge presented by the Amazing
Randi to a maker of high end audio cables. He challenged them by saying even i
self proclaimed and well established audiophiles would not be able to tell
the[ difference between their high end cables and a set of Monster cables he
picked up at Best Buy. The problem was none of these "audio experts" would suc
bmit to a blind test because choosing the cheaper cable may ruin their
reputations. I also recall Denon or a simialr company was trying to market a
proprietary cable format to compete with HDMI, and they were charging $300
for a 6 foot cable. The product reviewer needed a longer cable in order to
perform his testing, so he asked a friend to figure out the wiring scheme.
The "proprietary format" turned out the same pinout as a CAT 6 patch cable.
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