01-04-2012, 11:26 PM
Hmm: it seems that the mystery is deepening about this set. 
Apparently, the model RS4 uses a different valve line-up compared to what I have in this set, and that is what I would expect to find in the model MP. But the MP has 3 wavebands & speaker at the top of the cabinet. Mine has 4 wavebands and speaker at the bottom. So I wonder: could it just be that on account of the fact that the RS4 was in production during WW2 - as was the model MP - that because of shortages of parts, Pye built this set as an RS4 but used valves from the model MP?
Incidentally, I did a bit of work on it today. Made the mains input arrangements safe; found a couple of faulty capacitors; a few squirts of switch cleaner; drop of oil on the tuning shaft; hooked it up to a few feet of wire draped around the bench and switched it on (with voltmeters in suitable places
). And it worked fairly well, too. The audio was not distorted, there was plenty of it on fairly strong MW and LW stations. However there is a slight tendency for a little 'tunable' instability: I suspect defective decoupling components, although the EF9 metallised screening looks a bit dodgy. Fortunately, the cct. looks quite basic, so I'm sure that a more in-depth investigation will reveal all. At least there weren't catastrophic component failures found ( I like tempting fate! )
Al.
Apparently, the model RS4 uses a different valve line-up compared to what I have in this set, and that is what I would expect to find in the model MP. But the MP has 3 wavebands & speaker at the top of the cabinet. Mine has 4 wavebands and speaker at the bottom. So I wonder: could it just be that on account of the fact that the RS4 was in production during WW2 - as was the model MP - that because of shortages of parts, Pye built this set as an RS4 but used valves from the model MP?Incidentally, I did a bit of work on it today. Made the mains input arrangements safe; found a couple of faulty capacitors; a few squirts of switch cleaner; drop of oil on the tuning shaft; hooked it up to a few feet of wire draped around the bench and switched it on (with voltmeters in suitable places
). And it worked fairly well, too. The audio was not distorted, there was plenty of it on fairly strong MW and LW stations. However there is a slight tendency for a little 'tunable' instability: I suspect defective decoupling components, although the EF9 metallised screening looks a bit dodgy. Fortunately, the cct. looks quite basic, so I'm sure that a more in-depth investigation will reveal all. At least there weren't catastrophic component failures found ( I like tempting fate! )Al.
