mata_haze
Well-known member
hi everybody.
I have just finished wiring a soundcraft 2400 channel strip up (thanks NRG recording for the boards!), but there is a problem on the microphone input stage.
there is a distortion phenomena happening right after the array of transistors named TR1 through TR6 which are responsible for the gain staging.
the picture below shows the distortion, which is also gain dependant,
on my scope (TOP scope Collector of TR6, BOTTOM scope Input signal to the channel) .
to make sure there wasn't anything else loading the circuit I momentary unplugged all the OPamps following that stage.
Could this distortion be due to a bad transistor?I wonder if just a bad one will compromise the functioning of the entire stage.
any help will be much appreciated..
here is the scope picture
and this is the schematic
I have just finished wiring a soundcraft 2400 channel strip up (thanks NRG recording for the boards!), but there is a problem on the microphone input stage.
there is a distortion phenomena happening right after the array of transistors named TR1 through TR6 which are responsible for the gain staging.
the picture below shows the distortion, which is also gain dependant,
on my scope (TOP scope Collector of TR6, BOTTOM scope Input signal to the channel) .
to make sure there wasn't anything else loading the circuit I momentary unplugged all the OPamps following that stage.
Could this distortion be due to a bad transistor?I wonder if just a bad one will compromise the functioning of the entire stage.
any help will be much appreciated..
here is the scope picture
and this is the schematic