What value pot did you use? The diagram shows 500 ohms but you previously gave it as a 500k.
What value was installed?
Did the pot actually affect the DC offset?
VR9 on your board?
What value was installed?
Did the pot actually affect the DC offset?
VR9 on your board?
500 ohm, my mistake I meant 500ohm (I ordered a replacement)
501 ohm was installed.
yes, it did.
VR9, yes the same one.
501 ohm was installed.
yes, it did.
VR9, yes the same one.
How different is the circuit for the jfet?
I don't see the pot SVR1. What else is different?
What's the DCV on pins 8, 9 and 10 on U9?
I don't see the pot SVR1. What else is different?
What's the DCV on pins 8, 9 and 10 on U9?
JFET circuit
D: connected to Pin14 5470
S: connected to pin3 of 5470 as per the diagram
G: driven by Pin7 of 5470
will post voltages later on, we have an electricity outage
pin8 & pin9 are bridged on U9
D: connected to Pin14 5470
S: connected to pin3 of 5470 as per the diagram
G: driven by Pin7 of 5470
will post voltages later on, we have an electricity outage
pin8 & pin9 are bridged on U9
I hadn't heard of that in years. I didn't know it was till a problem.
When you get power back:
U9 on 9001 diagram (left)
On your amp (right side)
Pin 1: =
Pin 2: =
Pin 3: =
Pin 4: =
Pin 5: =
Pin 6: =
Pin 7: =
Pin 8: =
Pin 9: =
Pin 10: =
Pin 11: =
Pin 12: =
Pin 13: =
Pin 14: =
When you get power back:
U9 on 9001 diagram (left)
On your amp (right side)
Pin 1: =
Pin 2: =
Pin 3: =
Pin 4: =
Pin 5: =
Pin 6: =
Pin 7: =
Pin 8: =
Pin 9: =
Pin 10: =
Pin 11: =
Pin 12: =
Pin 13: =
Pin 14: =
its an ongoing issue for SA
Pin 1: = 6v
Pin 2: = 6.5v
Pin 3: = 6.5v
Pin 4: = 11.7v
Pin 5: = 11.7v
Pin 6: = 0.02v
Pin 7: = 10.9v
Pin 8: = 5.9v
Pin 9: = 5.9v
Pin 10: = 5.4v (amp draws current limited to 4A)
Pin 11: = 0v
Pin 12: = 6v
Pin 13: = 5.9
Pin 14: = 5.4v
Pin 1: = 6v
Pin 2: = 6.5v
Pin 3: = 6.5v
Pin 4: = 11.7v
Pin 5: = 11.7v
Pin 6: = 0.02v
Pin 7: = 10.9v
Pin 8: = 5.9v
Pin 9: = 5.9v
Pin 10: = 5.4v (amp draws current limited to 4A)
Pin 11: = 0v
Pin 12: = 6v
Pin 13: = 5.9
Pin 14: = 5.4v
Are you sure that you have pins 8, 9 and 12 correct for your amp?
I'd expect the audio in to be on the same op-amp section as the bridged pins.
I'd expect the audio in to be on the same op-amp section as the bridged pins.
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