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This is a fresh amp that i finished 3 days ago. First the 2 channels worked but after i played the normal channel at loud volume it stopped working. The tmb channel still work fine. Maybe its a solder joint. Where are the places i should check first for problems for this channel?

Yes, it sounds like a bad connection somewhere. Check the easy things first. Make sure the voltages measure good at V1. Check the connections at the input jacks, V1 socket, tone and volume controls. Then check the resistors, capacitors and flying leads on the board. Most problems like this are caused by a short on the shielded cable at the input jacks.

Ok thank you i will check this tonight. But its weird that the channel worked properly for a while and then stopped working .. the volume at 10 I can ear a tiny sound .

I measured the voltages on v1
Pin 1: 132v (155)
Pin 3: 0.92v (1)
Pin 6: 2.90v (155)
Pin 8: 2.0 v (1)
a
This is my first build . So i have a lot to learn . From where do you think the voltage loss on v1 pin 6 come from?
The wire of the pin 6 go to the turret board below a sozo .0047uf and beside a 100k resistor ,the voltage of the turret is the same than v1 pin6.

That's why your normal channel isn't working. Check the connections at each end of the 100k resistor that feeds pin 6. Make sure they are soldered properly.

Measure the 100k resistor too and make sure it's good.

The resistor is good and i resosdered the 2 ends of the resistor. I am still have the same problem. When the resistor is connected to 1 of the turret it measure the right value but when i connect it to the other turret the value rise by progression until it reach 75-80k . Any idea ? I resoldered many times and it dont change anything.

Try a different tube in the same spot. Even v2 as a test. Make sure the cathode connections to ground are good. The low voltage is the problem. Could also be a bad wire from board to pin.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

I swap the tube on v1 and the normal channel is working.
Thanks mitch and stephen for your help !

Good to hear that.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

My favorite sound of the amp is the mix of the 2 channels with a patch cable. Really nice classic rock sound!

Mine too!

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps