OOps , We got problems !!!!
Looking at the bottom of that chassis , my first impression is that the rectifier tube socket has had most of it's wiring removed , and that's really bad as it indicates that some hack has been at it before ya got it . This will not be a simple recap , as the wiring will need to be put back right . The green "dogbone" resistor likely was connected to the rectifier socket and is part of the missing wiring I see . There are only 4 capacitors there , and the two more in the round can so as long as no others of them are missing (and it does look like there are the right number of caps in there , at least
) then it's only a grand total of 7 caps with the one at the volume control added in . But now , the missing wiring is concerning , was there prior troubleshooting attempted there and something removed ? Possibly a filter choke like one that may have resided at the back of the speaker ? Or maybe it's the output transformer that's missing ? A couple of good closeups of each of the three tube sockets (from below , of course) and a good look at whatever iron (the two transformers) is on the top of the chassis would be most helpful right now .
PS , are there any wires coming from the bigger transformer that are not hooked up to anything ?