Analogue Electronics-"Iron in the Soul"

[dr pepper]

Hi,
Do some research on a vox ac30, its a 60's guitar amplifier combo which is still very popular today, the design doesnt use negative feeback, and the result is a very distinctive, or 'distorted' sound that makes guitarists pay way to much for a old amplifier.
Then you can get into the valves themselves, groove tubes sell them with diffrent hardness's.

 

[JimB]

Did you notice that many singers today can't sing worth a damn....

As per the British Grand Prix last Sunday, where they had some TSB* shrieking out an awful rendition of the National Anthem.
What the hell is all that about? We never had that before, did we?
Sounds far too trashy and American football (?) game to me, us Brits are far more dignified than that.
What is wrong with a GOOD band such as the Royal Marines simply playing the tune? Much more dignified.

JimB

TSB = Tuneless Shrieking Bi*ch

 

[Nigel Goodwin]

As per the British Grand Prix last Sunday, where they had some TSB* shrieking out an awful rendition of the National Anthem.

Never noticed - that's what Sky+ is for

 

[dr pepper]

Its only about one thing these days - £££'s

 

[KeepItSimpleStupid]

Hi Cruts



So how do you define ' Noise ' then ?

S

Noise vs. Music

https://physics.info/music/

You asked!

 

[Musicmanager]

Morning KISS

No I didn't !
I asked Cruts for HIS definition of noise .. .. .. the comparative spectral analysis of the soundwaves produced by either concept is beside the point in discussion, I think.

Good to hear from you

S

 

[audioguru]

I wish the excellent article about music and noise made a comparison with acid rock or RAP and real music.

A common emitter transistor makes the same type of even harmonics distortion (it sounds musical to some people) as an old common cathode vacuum tube (valve) circuit. Half of a waveform is compressed.
Push-pull outputs compress both halves of a waveform equally so the even harmonics cancel and are converted into odd harmonics that sound unmusical.

Old vacuum tube amplifiers need an output transformer to convert the high output impedance of vacuum tubes to a low impedance to drive a low impedance speaker but since the output transformer cuts highs and lows and doing so produces phase shifts then not much negative feedback (or no negative feedback) could be used to cancel distortion. But modern solid state amplifiers have a very wide frequency range without phase shift then an output transformer is not needed so they have LOTS of negative feedback and extremely low distortion.

My first portable radio (1957 I think) had germanium transistors, an output transformer and no negative feedback. Since it was AM with a muffled frequency response the odd harmonic distortion was not too bad. It sounded similar to a vacuum tube amplifier.