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#1
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After all this discussion, I decided to pull the 7" Motorola off the shelf. I never restored the set, but I did the preliminary checking of the condition of the set. Of course, the set works very poorly and I don't remember what I did to check the basics. IIRC, I bridged the 'lytics and installed silicon diodes to replace the seleniums. I didn't do anything to it but plug it in. It hummed and it has a dim display on the screen. BTW, this set was dated Feb, 1949 and uses 1/2 of a 12SN7 for the 1st audio. More much later! |
#2
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#3
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This set is one of the portable styles and was complete with the antenna and base and in reasonable condition. The CRT seems to be good, but the true test is when the set is restored. |
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I'm not sure this applies but the date is close.
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#5
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Well this helps if it were max volume but mine is minimum volume hum.
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Audiokarma |
#6
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1. Does the hum actually get louder as you turn the volume control down? 2. Do you observe any change of hum as you change the volume control when the grid of the 25L6 is disconnected? 3. Are you absolutely sure that the cap across the 330 ohm resistor in the cathode circuit of the 25L6 is connected correctly? Properly grounded? 4. Do you have a few more 25L6s to try? jr |
#7
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