Blue Circle Gear?

I've heard great things about this equipment.  You only live once...

"There is an authorized service shop for Blue Circle."

That would be-

https://www.dtsaudioelectronics.com/Authorized-Service.html

I don’t have experience with their preamps but did own a BC-204 amp that had issues. I would cringe every time I turned the amp on because I sometimes I would hear a loud pop noise. 

Certain defunct brands are worth buying ,  but I just wouldn’t with Blue Circle. 
 

Sonic Frontiers, different story as Parts Connexlon still repairs and mods them.  
 

Wow , that place has exclusive repair for many good brands...good to know .  Most of those brands listed are still in business.