johnnytoobad
Active member
Hi!
A friend asked me to build him a microphone tube preamp that he can also use as a DI for his Helix and his acoustic guitar.
Talking together about what he likes and wants we went for kind of modified LA2A compressor but without compression, just the amplifier part, but telling me he wants to use ribbon microphones, I was scare it missed some gain so i added a first stage.
Heaters are DC and elevated.
So now it almost sounds fine but I got strange behaviors.
When turning first potentiometer I got some noise but noise disappears when it is all the way up.
And on second potentiometer I got oscillation after turning it up to 1/3.
Do you have any suggestions?
Thank you!
A friend asked me to build him a microphone tube preamp that he can also use as a DI for his Helix and his acoustic guitar.
Talking together about what he likes and wants we went for kind of modified LA2A compressor but without compression, just the amplifier part, but telling me he wants to use ribbon microphones, I was scare it missed some gain so i added a first stage.
Heaters are DC and elevated.
So now it almost sounds fine but I got strange behaviors.
When turning first potentiometer I got some noise but noise disappears when it is all the way up.
And on second potentiometer I got oscillation after turning it up to 1/3.
Do you have any suggestions?
Thank you!