Because of the vagaries of the English language, there is always the chance I am not understanding exactly what you did to investigate this problem, but I will say it is VERY highly unlikely that all the tubes in one channel went dead coincidental with just moving the system from one room to the other. Furthermore, problems with tubes are usually heralded by funny or not so funny noises, not dead silence. Don't waste your time swapping tubes, is my advice.
You also wrote, "I switched the configuration of the wires in my tone arm around and I got some sound from the silent speaker." This is not completely clear. Do you mean to say that the "dead" speaker worked fine and the other speaker then went dead? In other words, that the problem swapped sides? But also you say that switching the ICs that convey the signal from the tonearm to the phono stage had no effect; correct? If so, then there may be a problem in the junction box where the tonearm wires terminate and the ICs initiate. Or perhaps instead of a junction box, you have a 5-pin DIN plug. There may have been an issue with the DIN plug; perhaps there is an internal short of some kind. Anyway, a clearer description of what you did and what you heard would help.
You also wrote, "I switched the configuration of the wires in my tone arm around and I got some sound from the silent speaker." This is not completely clear. Do you mean to say that the "dead" speaker worked fine and the other speaker then went dead? In other words, that the problem swapped sides? But also you say that switching the ICs that convey the signal from the tonearm to the phono stage had no effect; correct? If so, then there may be a problem in the junction box where the tonearm wires terminate and the ICs initiate. Or perhaps instead of a junction box, you have a 5-pin DIN plug. There may have been an issue with the DIN plug; perhaps there is an internal short of some kind. Anyway, a clearer description of what you did and what you heard would help.