R&D
Phono Stage Amplifier
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**************This page will be fulfilled after the end of development. *********************
There are many transistor (solid state) based Op Amp-s with excellent parameters. All you need to do is connect power to it and it is done. Even no adjustments needed- you will get exact parameters promised by manufacturer.
But I want tubes in my devices , as we have talked before. |
I focused again on tube based schematics and again it was about classics.
The only thing I had to do was to make it conforming to modern sound recording level requirements which became much higher by any specific parameters . There are two most important parameters in Phone Preamplifier building: Noise and Distortion. First is solving by special layout and the second by meticulous tuning (tubes electronic modes adjustments). As we are dealing with tiniest siglas levels electrical interference from air becoming comparable with signal from cartridge. Especially nowadays when we are surrounded with EM emission from WiFi-s, transmitters on the roofs,cell phones, switching power supplies in computers, appliances etc., certain efforts has to be done to reach deep isolation from them. |
In this Phono Preamplifier xxxx and xxxx series tubes are applied. [This feature is temporarily hidden as it makes this device completely different .It will be available right before production launching ] These "pencil" Tubs with golden grids had been developed for space research. They are per se unic as are able to work with Zero Bias. It means that you can ground cathode without resistor thereby eliminating resistor's noise in first amplification circuit, which in most critical for final signal noise rate (and the purity of signal ultimately) Eliminating capacitors from main amplification path excludes their chance to alter (damage) musical signal. |
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As most physical works on this was done parallel to Headphone Amplifier and I would not show on this page much about engineering as you can see it there.
I will just put here some pictures from the flow of working process which may be interesting to see......
I will just put here some pictures from the flow of working process which may be interesting to see......
Housing of Phono Amplifier will be redesigned before launching to the concept line of Headphone Amplifier with remote power supply and black colour finish before release.
**************This page will be fulfilled after the end of development. *********************