Hold off a bit. What did you install at R6? If there is a resistor there you may be ok.
Let me check the photo again....
Let me check the photo again....
I am hoping and praying that mkane's Aleph J will sing eventually. His amp and all the trials and tribulations he is going through (together with the experts) here is an excellent point-by-point approach of troubleshooting an Aleph J.
I am also in the midst of building a J and about to power up with the boards for the first time. Godspeed.
I am also in the midst of building a J and about to power up with the boards for the first time. Godspeed.
mkane77g - Excellent! Waiting for wonderful news.
docjrev - Congratulations! Can't wait to hear what you think.
docjrev - Congratulations! Can't wait to hear what you think.
Houston, we have a problem. Left side not getting warm. Were getting 25VDC to it but somethings amiss. The resistors you measure across to set bias shows zero
Hmmm....let's get a few measurements:
Check the rail voltages on this PCB.
Please measure the voltages across D1, R8, R7, R16, R17, R18 and R19 as well
as the DC offset.
Check the rail voltages on this PCB.
Please measure the voltages across D1, R8, R7, R16, R17, R18 and R19 as well
as the DC offset.
Sorry for the delay, I had to figure out what was where. R8 shows-4.3VDC. The other R's are .001. Don't know how to measure D1 but the board is getting -25VDC
Please verify you have about +25V at V+, 0V at GND and -25V at V-.
Have you tried adjusting the bias pot to see if you can get the voltage across, R18 to rise?
Have you tried adjusting the bias pot to see if you can get the voltage across, R18 to rise?
+25VDC / -25VDC don't know how to gat at checking for 0V @ ground. The embarrassing part is turning the bias pot got me .400VDC
That lit the other LED.
That lit the other LED.
