jsefer
Well-known member
I just built myself a preamp out of an old M8, I practically gutted and rebuilt the units using a new design. Took some ideas from other sites and added my own flavor. Coupling Caps are russian PIOs, Power caps are Sprague and Russian PIOs. Tubes are telefunken. Tran-x are cinemag.
Im getting some oscillation at high levels, and the ecc83 seems to distort very early as a bus insert but as a DI seems to sound really good, a little muddy on the bass side, but other wise its a very usable unit.
EF86 is quiet with about a -60db noise floor.
Im posting the schematic to see if there is anything anyone sees that I might be able to try and keep redefining the unit. So far the only issue I see is that it has no negative feedback so I asume thats why its a little bit noisy on the ecc83 side.
Im no expert and this is my first tube project, so Im looking for ideas. I had posted the schematic before and got some good ideas that I implemented so with the new ideas, Im trying to see if theres any other possible things i can try. This unit is going to live as my mic preamp and bus insert to color anything i run through it.
If anyone has any comments or tips, I very much appreciate your time.
Im getting some oscillation at high levels, and the ecc83 seems to distort very early as a bus insert but as a DI seems to sound really good, a little muddy on the bass side, but other wise its a very usable unit.
EF86 is quiet with about a -60db noise floor.
Im posting the schematic to see if there is anything anyone sees that I might be able to try and keep redefining the unit. So far the only issue I see is that it has no negative feedback so I asume thats why its a little bit noisy on the ecc83 side.
Im no expert and this is my first tube project, so Im looking for ideas. I had posted the schematic before and got some good ideas that I implemented so with the new ideas, Im trying to see if theres any other possible things i can try. This unit is going to live as my mic preamp and bus insert to color anything i run through it.
If anyone has any comments or tips, I very much appreciate your time.