Can you do this? TA 2:90 Help!

[BigMesa]

I just unpacked my TA/2:90 from storage to get ready to sell and there is a problem with side A. If I use the instrument selector switch and plug straight in to the 2:90 with my guitar it is loud and clean. If I switch it back and run the guitar through the TA to the 2:90 is has extremely low volume out of the cabinet on side A, Side B works just fine. I know it's not tube related (preamp or power amp) or cable related. I don't think it would be the TA because I just got it back from Mesa a couple months ago to have a noisey transformer and some segmented LED's replaced and it got a clean bill of health at that time.

The Question is....can I put headphones in the TA's output and test to see if I'm getting proper volume out of the TA in each output without causing damage to the TA?

 

[crane]

First switch cable connection from channel A and B between the TA and the 2:90. If the volume on side A stay low, it's not your TA.

 

[BigMesa]

I feel like an idiot. I really need to go through my cables as I found that I had two bad cables....one was in the rig, one I tested with lol. Third time is a charm and everything is working 100% again, thx!