Zergonion
Member
- Joined
- Jan 2, 2015
- Messages
- 11
Hi everyone!
Some time ago I purchased a NTP stero line-amp (Type 4-30322, Serie A 8 ), it houses two identical pcbs with Beyerdynamic TR/BV 310 003 002 input transformers and RC4558 op-amp. The seller gave me wrong pinout, so I'm hoping to get some help here, to wire it up properly.
This is what I figured out:
+ and - marks on pcb are for power (+/-15V);
main inpuit: one input goes through resistor and capacitor to primary start, other input goes through resistor to TR/BV primary end; from TR/BV secondary end goes to -input of opamp, and secondary start goes to +input of opamp; from opamp output the signal goes to gain trim (marked A on pcb), and comes back (marekd B, C on pcb). And there's a main output next to R10 and R11.
Further on I'm lost. There are two pads on PCB marked D and E, that go to the back (Tuchel) connector - fader or gain/volume pot?
Please correct me if I there's something not right.
Here are the pics:
Some time ago I purchased a NTP stero line-amp (Type 4-30322, Serie A 8 ), it houses two identical pcbs with Beyerdynamic TR/BV 310 003 002 input transformers and RC4558 op-amp. The seller gave me wrong pinout, so I'm hoping to get some help here, to wire it up properly.
This is what I figured out:
+ and - marks on pcb are for power (+/-15V);
main inpuit: one input goes through resistor and capacitor to primary start, other input goes through resistor to TR/BV primary end; from TR/BV secondary end goes to -input of opamp, and secondary start goes to +input of opamp; from opamp output the signal goes to gain trim (marked A on pcb), and comes back (marekd B, C on pcb). And there's a main output next to R10 and R11.
Further on I'm lost. There are two pads on PCB marked D and E, that go to the back (Tuchel) connector - fader or gain/volume pot?
Please correct me if I there's something not right.
Here are the pics: