daveythomas
Well-known member
There are 6 12ax7 preamp tubes in the road king (v1, v2, v3, v4, v5, v6). Anyone know what each of these is responsibe for?
I just got my RKII on Friday. Sunday, CHs 3 and 4 faded in volume over a period of two to three minutes and were then very quiet. I pulled out the manual and thought that it might be the preamp tubes since it was only happening on certain channels, and I had tried the different power amp tubes with all the channels and found the same results.
So I started pulling preamp tubes and switching their positions. I did things like V1 for V5, V3 for V4, and so on. One time I lost all channels, another I lost the reverb, and another I lost CH2. The first mistake I made was not labeling the tubes so I could put them back in their factory order.
Here is the thing. The way I have them in now, everything works. Any ideas? If I have a bad preamp tube or two, would it be possible to have everything work if the bad ones are in lower gain positions?
Do you think there is a problem? Should I get them tested?
I just got my RKII on Friday. Sunday, CHs 3 and 4 faded in volume over a period of two to three minutes and were then very quiet. I pulled out the manual and thought that it might be the preamp tubes since it was only happening on certain channels, and I had tried the different power amp tubes with all the channels and found the same results.
So I started pulling preamp tubes and switching their positions. I did things like V1 for V5, V3 for V4, and so on. One time I lost all channels, another I lost the reverb, and another I lost CH2. The first mistake I made was not labeling the tubes so I could put them back in their factory order.
Here is the thing. The way I have them in now, everything works. Any ideas? If I have a bad preamp tube or two, would it be possible to have everything work if the bad ones are in lower gain positions?
Do you think there is a problem? Should I get them tested?