Hi, Vitor.
I bought TU-8200R and I have to assemble it.
After full assembly, can I just turn it on without connecting any output devices?
ex) no headphone, no speakers.
You can turn it on to check voltages, but do not play music without any output load.
Also turn down the volume or mute the source any time you connect or disconnect speakers or headphones. This applies to all regular tube amps with output transformers.
