Hi everyone
I have a pair of program amps from a vintage Gates Studioette console that I would like to convert for mic preamp / DI use.
I have attached the original schematics and it would be great if I can get some ideas and suggestions.
The first decision I need to make is how to modify the gain control.
So far I have wired the potentiometers like on the original schematic but would prefer having stepped gain control instead, for more precise stereo settings.
I am wondering wether I should be considering to implement a feedback based gain control, like on the Telefunken V76 for example.
Do you reckon it would be possible to implement a gain control with a simple 1 pole / 12 position switch ?
Are there particular advantages using a feedback gain control as opposed to the voltage divider approach ?
I guess the ideal position for the feedback control is between 1st and 2nd tube like on the Telefunken, but since here we also have feedback from the output transformer back into the 3rd tube, could that potentially be used as an additional gain control for adding harmonic distortion ?
Regarding the DI input, where you think is best to place that in the circuit, right after the input transformer or perhaps just in front of the output stage ? The REDDI di box has a very similar circuit with just a single tube with parallel connected triodes and it seems to have enough gain for DI use.
Thanks in advance
I have a pair of program amps from a vintage Gates Studioette console that I would like to convert for mic preamp / DI use.
I have attached the original schematics and it would be great if I can get some ideas and suggestions.
The first decision I need to make is how to modify the gain control.
So far I have wired the potentiometers like on the original schematic but would prefer having stepped gain control instead, for more precise stereo settings.
I am wondering wether I should be considering to implement a feedback based gain control, like on the Telefunken V76 for example.
Do you reckon it would be possible to implement a gain control with a simple 1 pole / 12 position switch ?
Are there particular advantages using a feedback gain control as opposed to the voltage divider approach ?
I guess the ideal position for the feedback control is between 1st and 2nd tube like on the Telefunken, but since here we also have feedback from the output transformer back into the 3rd tube, could that potentially be used as an additional gain control for adding harmonic distortion ?
Regarding the DI input, where you think is best to place that in the circuit, right after the input transformer or perhaps just in front of the output stage ? The REDDI di box has a very similar circuit with just a single tube with parallel connected triodes and it seems to have enough gain for DI use.
Thanks in advance