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Hi All,
I wanted to tackle the Globetrotter over the winter and started by removing the chassis without incident. Thought I’d start with testing the tubes and ordering all the caps etc. There are 8 tubes total and they are: 5Z3, my tester has no listing for this tube?? (5Z4) is on the list however.
6F5
6J7
6k7
6L7 All 4 of these don’t register on the meter, however, there is no wire connected to the top pins. The tester has a Black and a Red wire with the correct clips, but no instruction which to use. I used neither rather than risk damaging the tubes. Don’t have a next move. Use the Red or Black wire?? (sounds like I’m defusing a bomb)
6F6 tests weak (I thought I would upgrade to a 6V6)
6H6 tests good
6N5 again, no listing for this tube, but I think it’s the magic eye tube and it glowed brightly Green when I plugged the radio in briefly when I first acquired it. Schematic calls for a 6E5 however.
I will go over the parts list and start gathering the caps etc, but I’m stymied as far as what to do with the tubes. I guess I bought a sh*^ty tube tester.Hi Gary;
Here are the schematics from my red book. I hope they will work for you .
You will notice that they cover other models as well. If they are not readable
let me know and we can see if there is a way [through this forum] that I can email them to you.
So far I have not found a way to PM you or email you. [and I have looked everywhere I can think of]
I used a 6E5 in my radio and I have found that If I follow the schematics, putting in what it calls for, the radios work fine.
Although if you have a book on tube substitutions you can always use the substitute tube that the book says will work.
Dan in CalgaryPUT YOUR CURSOR OVER THE PHOTO AND A RED DOT WILL APPEAR. CLICK ON IT
Attachments:
Dan, et al,
O.K. I went ahead and ordered the pre WW2 radio axial cap kit which covers all the Mfd caps except for the 3 higher value ones that i ordered separately. I could not find a suitable “kit’ that contained enough of the MMFD Caps that I needed so I ordered those individually. However, 5 of them I was unable to easily find so I ordered the closest values I could get.
Is this O.K.? or should I look harder on line for the correct values. For example: I need a 115 mmfd and could only find a 110, also i couldn’t find a 175 mmfd and went with a 180 etc. I spent zero time looking so far except at Justradios.Good progress today!
First, thanks John for the intel about the leads. Using the Red wire, all the tubes tested good with the exception of the 6F6 which tests weak. I have replaces several lengths of wires as some were bare with insulation flaking off. Next replaced the line cord, hit it with compressed air and cleaned out years of schmutz. I have replaced about a third of the caps (the easiest to reach and read) and the radio now works and receives Am and short wavy noise on the other 2 settings. The volume control works great after a deoxit bath and the tone control works as well. The audio is understandable, but really muddy and unclear sounding.
Could be more caps or the 6f6 which is the output tube. Speaker sounds ok considering how many tears were repaired in the past. There are also 2 caps installed during a repair in the late 50’s and they make no sense to me yet as the values don’t show up in the schematic. So far I’m pretty pleased that it is already sorta working. Thanks for everyone’s help!!Gary in Montreal
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