Hi @NarenT
This makes sense because the first speaker jack has open load protection. Without anything connected to it, the Power Station is locked into bypass/standby.
You have done a great job of eliminating the other possibilities. Here is the No Sound troubleshooting guide, just check if there are anythings you have not yet tried, Power Station: Troubleshooting Guide
If your line-out functions, then this indeed isolates the issue to the tube side of things, meaning your reactive load is fine.
Can you see the heater filaments of your tubes glow when the unit is powered on? It could be a lot of things, such as a bad relay or even a power supply issue. It would be good to arrange a service.
Here are some options for that:
- How can I send my product to Fryette for a repair (RMA Request)?
- Can I get my Fryette product repaired at a local repair shop?
Regards,
Dan