xefe
Active member
- Joined
- Apr 15, 2009
- Messages
- 43
Hi.
Just bought this one on ebay. It looks like really nice preamps with tranformers on the input and one tranformer on the output.
I collecting some info on this one and as soon as it arrives i will mod it.
What i'm thinking to do (after reading the schematics):
- swap quad opamps on the signal path with modern and faster ondes like LME49740 or LT1359 (will add 0,1uf psu bypasses as well);
- upgrade psu smoothing caps to 2200uf and add a parallel 0,1uf bypass;
- upgrade all EL caps on the signal path to at least 47uf/25v Panasonic FM's;
- change the output voltage on the LM317 regulator from 30v to 34v, or 36v if i use the LT's instead of the LME's (more juice to the opamps and phantom power);
- adding unbalanced outs from each preamp.
What you guys think of the circuit and the mods i'm planning to do?
here's a schematic:
thanks in advance for any answers!
Just bought this one on ebay. It looks like really nice preamps with tranformers on the input and one tranformer on the output.
I collecting some info on this one and as soon as it arrives i will mod it.
What i'm thinking to do (after reading the schematics):
- swap quad opamps on the signal path with modern and faster ondes like LME49740 or LT1359 (will add 0,1uf psu bypasses as well);
- upgrade psu smoothing caps to 2200uf and add a parallel 0,1uf bypass;
- upgrade all EL caps on the signal path to at least 47uf/25v Panasonic FM's;
- change the output voltage on the LM317 regulator from 30v to 34v, or 36v if i use the LT's instead of the LME's (more juice to the opamps and phantom power);
- adding unbalanced outs from each preamp.
What you guys think of the circuit and the mods i'm planning to do?
here's a schematic:
thanks in advance for any answers!