Hi all,
I've got an Ampeg SVP1600 that had no output on either channel. I traced the signal through to IC101 (a NE5532 dual op amp) and lost it. Pulled the board out and put in a socket. As I didn't have a 5532 in hand, I put in a TL072 to test.
Now I have some output, but not much. TP4, the pin 1 output of the opamp. has 12VDC on it with no signal and it should read +/- 1VDC.
I'm guessing that the problem won't go away when I install the proper op amp, and I should dig deeper. Any suggestions?
I attached a partial schematic, I apologize for the quality of the scan. I've had the amp and the hard copy schematic for a couple of years and don't know what I did with the electronic version of the schematic. Now someone needs a big bass amp and wants to buy it, so I've dusted off this project.
Thanks, Tom
I've got an Ampeg SVP1600 that had no output on either channel. I traced the signal through to IC101 (a NE5532 dual op amp) and lost it. Pulled the board out and put in a socket. As I didn't have a 5532 in hand, I put in a TL072 to test.
Now I have some output, but not much. TP4, the pin 1 output of the opamp. has 12VDC on it with no signal and it should read +/- 1VDC.
I'm guessing that the problem won't go away when I install the proper op amp, and I should dig deeper. Any suggestions?
I attached a partial schematic, I apologize for the quality of the scan. I've had the amp and the hard copy schematic for a couple of years and don't know what I did with the electronic version of the schematic. Now someone needs a big bass amp and wants to buy it, so I've dusted off this project.
Thanks, Tom
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