06-01-2020, 08:12 AM
Yes tube rectifier, I will have to see what the eletro caps are, the previous tech restuffed them, but I think he wrote on them what he used.
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38-116 code 125 volume issues
06-01-2020, 10:26 AM
The next thing after the caps are sorted is disconnect the primary of #102 and feed it w/an audio source and see how it sounds. #102 has hv fed on both ends.
When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got! Terry
06-01-2020, 01:52 PM
Yeah it's got hv coming from 78 and 118.
When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got! Terry
06-01-2020, 02:17 PM
I will see what this does. I think driver tube has too much bias voltage and too much plate voltage on it on it but there is no ref in voltage chart for bias on the screen on the driver tube. So we shall see.
06-01-2020, 02:48 PM
Ok... Remove the 6J5 driver tube and measure the resistance from pin 2 to pin 7 at the tube base not at the socket. Should see a low resistance of a few ohms.
> no ref in voltage chart for bias on the screen on the driver tube. So we shall see. Good reason for it as the driver tube has no screen grid. When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got! Terry
06-01-2020, 03:11 PM
I said screen grid, but missspoke, the grid has like -35v on it. Plate 361V
if you are wanting me to check the tube filament, I replaced the driver tube with a known good one and it made no difference.
06-01-2020, 03:39 PM
Ok #109,110, and 111 Check for bad connection or bad ground assuming that the resistor are with spec. Having that much -bias cuts the tube off so there isn't any plate current that's why the voltage on the plate is so high.
When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got! Terry
06-01-2020, 04:59 PM
That is that "cannedohm" 3 part resistor which specs ok but I will check for bad connections etc. I don't trust those resistors.
06-01-2020, 06:01 PM
>That is that "cannedohm"
The pictorial shows then as 3 individual resistors. I think you are looking @ 117. When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got! Terry
06-01-2020, 09:32 PM
I believe I have found the issue, it appears that previous technician placed a 50k resistor as a replacement for 109 instead of 490K (500k), now to find a 490k or 500k resistor.
06-01-2020, 10:07 PM
That was the issue , it will blow your doors off now, I had not noticed that it was wrong until you pointed me in in the 109,110,110 area.
Thanks.
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