Hi everybody
I got hold of a pair of preamp boards from a Gates "Studioette" broadcast console.
These preamps feature 3x EF86 and 1x12AU7 tubes and were used as program amps in the console.
I would like to rack up the modules as stand alone mic preamps.
I have located a suitable power transformer, that should be enough for powering two channels.
https://www.tube-town.net/ttstore/Transformer/Power-Transformer/Toroidal/Toroidal-56VA::4908.html
I need to design some sort of power supply for powering the modules, I was wondering how much filtering should be used, each preamps already have filter capacitors on each preamp stage. Might be enough just using a single reservoir capacitor or better cascading a few rc filter stages ?
I have attached a schematic for this circuit
I got hold of a pair of preamp boards from a Gates "Studioette" broadcast console.
These preamps feature 3x EF86 and 1x12AU7 tubes and were used as program amps in the console.
I would like to rack up the modules as stand alone mic preamps.
I have located a suitable power transformer, that should be enough for powering two channels.
https://www.tube-town.net/ttstore/Transformer/Power-Transformer/Toroidal/Toroidal-56VA::4908.html
I need to design some sort of power supply for powering the modules, I was wondering how much filtering should be used, each preamps already have filter capacitors on each preamp stage. Might be enough just using a single reservoir capacitor or better cascading a few rc filter stages ?
I have attached a schematic for this circuit