trinityamps.com

Hi everyone, I just finished building a Trinity 18 kit, and it sounds great overall, but I’m getting a noticeable hum when the volume is above 5 even with nothing plugged into the input. I’ve double-checked my grounding and lead dress, but I’m still fairly new to amp builds, so I might be missing something subtle. Could this be related to heater wiring or maybe a grounding loop specific to this model? Any advice on where to troubleshoot next would be really appreciated.
Ragdoll Hit