machineghost
New member
I have been working on this project since July 2010. I did not want to make any mention of it on the forum with reason.
It has now reached a stage where its becoming a tangible reality and I think I can dare yapping about it here.
This is a dual channel vacuum tube microphone pre amplifier that has been designed (and busy being built) by request from a few of my sound-engineer friends. I guess you can sum it as a "dare".
The circuit is based around plain old common cathode triode stages with transformer input and output - floating balanced in and out as will as high-impedance instrument input (i.e. electric guitar). Zero feedback and isolated power supplies on all the feeds.
Gain attenuation is done with a shunt-type stepped system in 12 steps.
48 VDC power is supplied on the mic lines for solid-state condenser microphones.
The unit features over 200 VA of toroid transformers (custom wound).
Chassis was manufactured at a renowned facility in Pretoria.
All wiring (will) is done point-to-point - no PCBs.
Gloria in excelsis Deo
It has now reached a stage where its becoming a tangible reality and I think I can dare yapping about it here.
This is a dual channel vacuum tube microphone pre amplifier that has been designed (and busy being built) by request from a few of my sound-engineer friends. I guess you can sum it as a "dare".
The circuit is based around plain old common cathode triode stages with transformer input and output - floating balanced in and out as will as high-impedance instrument input (i.e. electric guitar). Zero feedback and isolated power supplies on all the feeds.
Gain attenuation is done with a shunt-type stepped system in 12 steps.
48 VDC power is supplied on the mic lines for solid-state condenser microphones.
The unit features over 200 VA of toroid transformers (custom wound).
Chassis was manufactured at a renowned facility in Pretoria.
All wiring (will) is done point-to-point - no PCBs.
Gloria in excelsis Deo