lagoausente
Well-known member
I have just finished two Supergreen channels. Setting CMRR on the first channel was ok.
But on the other channel, seems RV1 and RV2 have no effect, or if have is not noticecable.
Although, if conect the output ot the preamp to a headphones amp, setting RV1 and RV2 can make cancel the 100hz tone. But when measure signal between pin1 and 2, or pin1 and 3 can´t get the desired canceling on the Scope, like in the other channel.
Any idea about what may be faulting in this channel?
Edited: Well, now works. I have replaced one transistor and re-soldering some points that seems not properly soldered. Now works ok, CMRR set on both channels ok.
But on the other channel, seems RV1 and RV2 have no effect, or if have is not noticecable.
Although, if conect the output ot the preamp to a headphones amp, setting RV1 and RV2 can make cancel the 100hz tone. But when measure signal between pin1 and 2, or pin1 and 3 can´t get the desired canceling on the Scope, like in the other channel.
Any idea about what may be faulting in this channel?
Edited: Well, now works. I have replaced one transistor and re-soldering some points that seems not properly soldered. Now works ok, CMRR set on both channels ok.
