Audio Gods AG 7000.1D

[chrisg4]

Yeah I could remove those 4

 

[Perry Babin]

For some reason, I never saw the 'more pics' post. Probably because I use the 'go to last post' option. No need for more photos.

Remove the drivers and check/compare the amplitude on the collector of Q7 and 11. Also confirm that they're swinging to their corresponding rails.

 

[chrisg4]

amplitude is still not matching, please see below:

positive rail/drive

An externally hosted image should be here but it was not working when we last tested it.

neg rail/drive

An externally hosted image should be here but it was not working when we last tested it.

 

[Perry Babin]

Just to confirm, the waveforms on the bases and emitters of Q7 and 11 are of the same amplitude. Is that correct?

And the resistors R22, 29, 13 and 27 are all within tolerance. Is that correct?

 

[chrisg4]

Yes the waveforms are of equal amplitudes. The 470 ohm above the transistors are within tolerance, will confirm the rest tomorrow.

 

[chrisg4]

R13 measures 4.13kohm, out of tolerance
R27 is 1.03kohm.

 

[chrisg4]

Replacing R13 has resolved the amplitude issue, they are now equal.

 

[Perry Babin]

That out of tolerance resistor could have been causing shoot-through and high current draw.

 

[chrisg4]

Hi Perry,

what voltages should i expect on PT-IN, PT-OUT & MOD

 

[Perry Babin]

Are you posting images as described below?

To upload photos click the following:

Go Advanced
Manage Attachments
Browse
Upload

Repeat as necessary

Preview post to see how the post will look.

Click Submit Reply to send it to the forum.

 

[chrisg4]

Ok, uploaded as per your instruction.

what voltages should i expect on PT-IN, PT-OUT & MOD

 

[Perry Babin]

Please upload all images that way. All of the other images were lost.

The PT-in will be at the negative rail.

PT-out will be near 0v.

MOD will be a square wave swinging ±5v.