I presumed you're drawn it, and I 'presume' it's not quite correct - there should be something (an output) connected to the second cathode, pin 8. Assuming this is hard wired? (and not a PCB) sometimes it's easy not to be able to see a connection.
It is point to point not a PCB. I do now see another wire from the second cathode, It goes to a cap then on to a socket for an external speaker cabinet. I didn't notice it before, it is quite cramped in there. Now it makes sense, thank you for pointing that out.
I've drawn a LOT of circuits out over many years - if it doesn't make sense it's almost always because you made an error
In this case it didn't help the actual way you had drawn it (I usually draw it out roughly, and then rearrange it to be in a normal configuration), but it was a standard looking circuit IF there was a connection to the second cathode, and no reason for the second triode if there wasn't any connection.
The thing with drawing circuits out is you really need to know what it's going to look like before you start