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  #16  
Old 05-19-2018, 08:31 PM
dieseljeep dieseljeep is offline
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Looks really nice, I look forward to seeing how it works!
It looks like the 25L6 went to air!
That tube furnishes the lower voltage to many of the signal circuits. If it is bad, you'll have to replace it before going any further.
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  #17  
Old 05-22-2018, 01:07 PM
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Why in the world did Motorola put the tuner tubes under the chassis?? Seems stupid to me.
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  #18  
Old 05-22-2018, 02:58 PM
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Why in the world did Motorola put the tuner tubes under the chassis?? Seems stupid to me.
Some Motos keep the fly and 1B3 under chassis with an access door. Dumont used to put 6AL5 detector tubes and 6X4 rects under chassis in some of their RA-103 sets...There are probably more bad examples in the TV field but at least they were socketed...In the tube hearing aid era, the subminiature types they used (pencil diameterX1.5" long) were often soldered directly into the chassis.

^Yet another attack from boring-trivia-man, AKA me.
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  #19  
Old 05-22-2018, 07:23 PM
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Originally Posted by dieseljeep View Post
It looks like the 25L6 went to air!
That tube furnishes the lower voltage to many of the signal circuits. If it is bad, you'll have to replace it before going any further.
It didnít, it was just dirty. Donít know what the white stuff is.
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  #20  
Old 05-23-2018, 07:16 PM
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Iím starting to paint the cabinet and i think its turning out nice!
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  #21  
Old 05-27-2018, 11:12 AM
dieseljeep dieseljeep is offline
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Originally Posted by Electronic M View Post
Some Motos keep the fly and 1B3 under chassis with an access door. Dumont used to put 6AL5 detector tubes and 6X4 rects under chassis in some of their RA-103 sets...There are probably more bad examples in the TV field but at least they were socketed...In the tube hearing aid era, the subminiature types they used (pencil diameterX1.5" long) were often soldered directly into the chassis.

^Yet another attack from boring-trivia-man, AKA me.
That was the last Motorola that the chassis had to be removed to replace the tuner and high voltage rectifier. The slightly newer larger screen sets had the tuner on the right side with the tubes on top of the chassis. The HV rectifier had the trap door. UHF equipped sets had the 6AF4 under the chassis, but there was an access cover on the bottom.
Then there was the Sylvanias that had the solder-in 5642 HV rectifiers. IIRC, the tube location chart didn't even list them.
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