'97 LM6100 bias

marshalltsl said:
Hi all, specially a Big Hello to AMS.

Yesterday I tested bias from my LM6100. I think It has an issue. It works and sound properly. Without power tubes I get on pin5 -49,33 Vcc to -39 Vcc in all 4 power tubes sockets. But when I put power tubes It has a high bias on V11. 455Vcc on plate. 36 mv on V8 V9 and V10. 42 mv on V11. Do is It correct? I think It has a problem on V11. :unsure:
Thanks.
Click to expand...

Follow the tests without installing the output tubes.

1. Measure the DC bias voltage on pin 5 of the output socket - when standby is set to warm-up.
Note the pin 5 DC voltage of each socket.

2. Now turn the standby to operate.
How much did the DC voltage on pin 5 change when the standby is switched to "operate?"
Note the voltage change of each output tube socket.

3. Now compare the pin 5 DC readings between warm-up and operate.

Report what your pin 5 DC readings are.
Did the voltage stay the same? or did it change when you switched to "operate?"
 
Last edited:
Amp Mad Scientist said:
Follow the tests without installing the output tubes.

1. Measure the DC bias voltage on pin 5 of the output socket - when standby is set to warm-up.
Note the pin 5 DC voltage of each socket.

2. Now turn the standby to operate.
How much did the DC voltage on pin 5 change when the standby is switched to "operate?"
Note the voltage change of each output tube socket.

3. Now compare the pin 5 DC readings between warm-up and operate.

Report what your pin 5 DC readings are.
Did the voltage stay the same? or did it change when you switched to "operate?"
Click to expand...
I will do it. I'm driving.
Thanks AMS!
 
Amp Mad Scientist said:
Follow the tests without installing the output tubes.

1. Measure the DC bias voltage on pin 5 of the output socket - when standby is set to warm-up.
Note the pin 5 DC voltage of each socket.

2. Now turn the standby to operate.
How much did the DC voltage on pin 5 change when the standby is switched to "operate?"
Note the voltage change of each output tube socket.

3. Now compare the pin 5 DC readings between warm-up and operate.

Report what your pin 5 DC readings are.
Did the voltage stay the same? or did it change when you switched to "operate?"
Click to expand...
It chance a bit.
No operate.
V8 -49,55
V9 -49,55
V10 -49,55
V11 -49,55
Operate
V8 -49,38
V9 -49,38
V10 -49,38
V11 -49,38
 
You must log in or register to reply here.
Back
Top