Monday, February 26, 2018

Analog Simulation of magnetic tape music recording part ?


Perhaps a good idea would be to treat the interstage saturating transformer in the same way as on an electron tube class A (electrons flowing all the time) biased amplifier.


So arranging the DC electron current to be such that we are near the mid point of the B H magnetic hysterissis curve of the core material used.


Also arranging low inductance so that coil be current fed rather than voltage fed. Just like electron tubes driving magnetic reel to reel recorder heads with their high output impedance creating a constant current source with respect to frequency. So just like tape recording ie a rising recording voltage with respect to frequency. This is done automaticaly as the reactance of a coil increases with frequency so impedance increases and there is less shunt load across the electron tube output. So less voltage drop therefore rising response with increasing frequency. This is exactly the principle used on Pleiades filters for high pass EQ on microphones for compensating for proximity bass increase and other effects.


Constant current gives the chance at all the frequencies to saturate at high levels.


Would this instantenious peak limiting method resemble or simulate well enough the miracle of magnetic tape music recording?


Perhaps some more stages may be added to the Pleiades V6 battery electron tube preamplifier. The derivative amp will be possibly called V7.


The amplifying stage after the interstage transformer would do mathematical integration or high cut filtering at 6dB per octave for de emphasis. Same as on reel to reel tape playback pre amplifiers.












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