Lanzar 100q

[mike49504]

The problem iim having is the right front channel distorts like crazy i put new op amps in check the outputs for the channel all seem fine i checked the drivers and they seem fine also wondering whats the next step?

[Perry Babin]

I know nothing about this amp. I may be able to help get it going but I'm going to need much better photos that on the ampguts site.

A scope would make the process much easier.

[mike49504]

Back to this amp the right channels still disorts and everything is testing fine. wondering where i might go from here and what to check?

[mike49504]

Ok somemore checking into this amp. The amp has 4 op amps in it 1 for each channel.

3 of them measure
1=0
2=0
3=0
4= -14.79
5=0
6=0
7=0
8= 14.57

theese channels work perfect


the left distorts channel the op amp reads

1=13.65
2=13.66
3=6.22
4=-14.38
5=6.22
6=13.70
7=13.70
8=14.56

is the op amp defective or do you think something is driving the voltage up on this ?

[Perry Babin]

It appears to be defective.

Are pins 1 and 2 tied together?

Are pins 6 and 7 tied together?

[mike49504]

pins 1 and 2 are tied together

pins 6 and 7 are tied together

[Perry Babin]

If those pins are tied together and the output of the op-amp doesn't match the voltage on the non-inverting input of the op-amp, that op-amp is almost certainly defective.

[mike49504]

Unless this op amp is suppose to have thoose voltages or something else is blown i have the same reading on a new op-amp

[Perry Babin]

When an op-amp is used as a buffer (output pin and inverting input pin tied together) the output should match the voltage on the non-inverting input within a few millivolts. If it doesn't, the op-amp is almost always defective.

If the new op-amp has the same voltages, something connected to the output of the op-amp has to be driving voltage to the op-amp output.

Are you 100% sure that you didn't accidentally reinstall the old op-amp?

[mike49504]

positive ill try another one just to be sure.