look for cheap tubes on ebay, maybe even common tube replacements w/ adapters to make tube replacements cheap, try to find a club w/ old knowledgable collectors.
Most people knowing this generation of sets probaly have already passed since 80 + years old. LOOKs way too well built for homebrew, clean and professional. A detail cleaning and refinish will show potential of set, these look great well when done as a piece of furniture to display openly and enjoy.
Power supply w/ large caps to elininate AC hum, Audio w/ high imp. xformer w/ newer reproducer in horn maxes out quality sound.
I can demo. a 1925 AK big box 20 to prove this, I'm 60 miles N. of SF if ever over here. Volume and quality can be heard throughout entire house.
Probaly that's a 1920 to 1924 set earlier tube sockets, definetly rarer & worth the effort.
Try to find collectors w/ a large amount of battery sets, mostly as display, may be missing factory paper lable or holes for plate?
I think saw similair or same one on fleabay for sale, That center knobs looks replacement for broken tuner assy. I think a replacemnet tuner assembly exactly for sale lately to match other two, LOOK to correctly restore to original.
