06-19-2016, 12:19 PM
1+ Kevin
The mia tube is a 50L6. From the chassis layout I would think that the 50L6 would go where the 12SQ7 is but I could be wrong. Check the wiring to see where the output transformer is connected, that's where the 50L6 goes. Blue wire to pin 3 and red wire to pin 4. The problem is that there was so many of these types of set made that it is difficult to pin down a specific manufacturer w/o any markings. Again I would guess that the chassis may have originally come from a bakelite cabinet set because of the slotted hole at the rear. Truth be told I think most have seen so many of these 5 tube ac/dc sets we can work on them blindfolded. So from a service aspect it's not a problem. If you have a burning desire to know the who and when that when it's an issue.
Terry
The mia tube is a 50L6. From the chassis layout I would think that the 50L6 would go where the 12SQ7 is but I could be wrong. Check the wiring to see where the output transformer is connected, that's where the 50L6 goes. Blue wire to pin 3 and red wire to pin 4. The problem is that there was so many of these types of set made that it is difficult to pin down a specific manufacturer w/o any markings. Again I would guess that the chassis may have originally come from a bakelite cabinet set because of the slotted hole at the rear. Truth be told I think most have seen so many of these 5 tube ac/dc sets we can work on them blindfolded. So from a service aspect it's not a problem. If you have a burning desire to know the who and when that when it's an issue.
Terry
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