Thor Audio repair?

Don't know about Thor but in general if this unit 'broke down' as a result of a tube failure, which you replaced, and will not now turn on, it could be a couple of things, neither of which would be difficult for a techie to service, i.e. blown fuse or a resistor in the bias circuit. Tell folks where you live and you'll probably get some recommendations for a repair shop nearby. 

Thanks newbee. I live in southern California, San Diego area. Will search for local stereo repair shops and ask them.

Stereo Unlimited was a go-to place when I lived in SD (nearly 35 years ago), and they are still in the high-end business. They are located in the Sports Arena area. You might ask them to recommend a repair shop.

Thanks Mike.
I found this place in Oceanside, TubeAmpRepairShop.com.
The owner seems to be very knowledgeable in tube gears. I dropped off the preamp this afternoon for him to inspect. Shall see.

Here’s an option: Mike Zuccaro.

San Diego

http://www.audiocraftsman.com/

Thanks, tvad!
This is exactly what I am looking for!