Joe,
Thanks again for your posting at Audiogon.
Like you say, a picture is worth a thousand words, and I wonder, if perhaps you could email me a few JPGs indicating the two points, where I have to put the black and red probes of my multimeter.
I think, I will manage to unscrew the bottom part, and sides of my JOR and put it back together.
The location of the bias potentiometers are obvious
I guess, and if I know what the values are (110mv), adjusting the bias should be no big problem.
Basically what I don't know is, where I have to put the black and red probes of my multimeter.
I also don't know, if the value of 110mV stays the same for KT90, KT88, KT77 and EL34 tubes, or if the value changes accordingly, and if it does, what the values for each kind of tubes are.
Perhaps changing the driver tubes, lets say from 12ax7 to
5751 or within different 12AX7s affects the bias settings
as well. I don't know.
Unfortunately I am not living in Canada or the US, otherwise I could ask Pierre Gabriel
The dealer here in Thailand has told me, the JOR has auto-bias, but obviously, it has a fixed bias setting. So, the local dealer seems not to be of great help in this case.
Thanks again for your help.
Best regards,
Robert
Thanks again for your posting at Audiogon.
Like you say, a picture is worth a thousand words, and I wonder, if perhaps you could email me a few JPGs indicating the two points, where I have to put the black and red probes of my multimeter.
I think, I will manage to unscrew the bottom part, and sides of my JOR and put it back together.
The location of the bias potentiometers are obvious
I guess, and if I know what the values are (110mv), adjusting the bias should be no big problem.
Basically what I don't know is, where I have to put the black and red probes of my multimeter.
I also don't know, if the value of 110mV stays the same for KT90, KT88, KT77 and EL34 tubes, or if the value changes accordingly, and if it does, what the values for each kind of tubes are.
Perhaps changing the driver tubes, lets say from 12ax7 to
5751 or within different 12AX7s affects the bias settings
as well. I don't know.
Unfortunately I am not living in Canada or the US, otherwise I could ask Pierre Gabriel
The dealer here in Thailand has told me, the JOR has auto-bias, but obviously, it has a fixed bias setting. So, the local dealer seems not to be of great help in this case.
Thanks again for your help.
Best regards,
Robert