12-19-2014, 06:49 PM
It appears to be a homebrew trf set. If it were a production set the bus wire would be straighter and neater, also the rheostats would probably match. The missing tube should be an 01a or a 112a if it is the output tube but either tube will work.
More than likely the audio transformers are open.
More than likely the audio transformers are open.