VOX AC30C2 - Top Boost has less output/volume than Normal channel.

[spunko]

Hola amigos. I having some trouble with this VOX AC30C2 and I need your valuable help.
Like the tittle says, the top boost channel has less volume than the normal channel. I know is hard to explain, also I don't have a scope to see an image, and the only way to explain would be Top boost at 8, and Normal at 5 to have them sound even.

I already tried some basic stuff and the result was the same:
 - changed tubes.
 - swaped input PCBs - changed the wires from top boost to normal and viceversa. The result was expected, low volume on Normal input.
 - tested without power tubes and PI tube, sent preamp signal to another power amp, same result

I checked for DC voltages and I think some are not present on V1 (pins 3, 7 and 8) compared to V2 and V3.
Here is what I got. What would you suggest to check next?
Thanks.


https://el34world.com/charts/Schematics/Files/Vox/Vox_ac30c2.pdf

[sluckey]

I don't trust your voltage reading. Check again.

[spunko]

I have typed everything wrong    Thanks for pointing it out. 

Rechecked V1/2/3. First reading was taken without power tubes. I have added a seccond reading with all tubes installed.

[sluckey]

Those voltages look fine. No problems.

[spunko]

Thank you very much. I was looking for voltages on the schematic and couldn’t find them to compare.
Pots were super dirty and scratchy. Cleaned them, resit all conectors and tested again and  now it has life and it sounds loud. Maybe one conector wasn’t pushed all the way. I did the chop stick test from the start but nothing happened.

I don’t know if I’m going crazy but I still fell like it lacks some volume. It sounds loud, but not as loud as the normal channel, like if normal is on 5, top boost is on 4.
What could I check next?

[sluckey]

I think you may be chasing rabbits. Don't follow down the hole!   

[pdf64]

The V3 LTP anode voltages seem somewhat different to each other, how about if the valve is swapped out?

[AlNewman]

Shouldn't there be a differential between pins 8 and 7 of V2?

[sluckey]

Shouldn't there be a differential between pins 8 and 7 of V2?

Yes. Probably about a volt.