Old Muntz TV for sale Locally to me, Should I pick it up?

[vortalexfan]

Originally Posted by Kevin Kuehn

I have no idea how you're measuring 193 volts dc now if the those tubes are being fed b+ though R13, which a while ago you said you measured 158.4vdc on the input side and 154.4 on the output.

Why, am I not supposed to be getting 193 Volts there?

Also I'm finally getting some response out of the tuner, it seems that two of my 6AU6 sockets will need replacing unfortunately, but the good news is that the voltages on the 6AU6 Video IF tubes are spot on to what they are supposed to be, I'm just not getting a good connection between the tube and the socket because of the sockets being faulty, (the center grounding lug is busted off on both of them and the sound IF socket some how popped one of its retaining rivets loose) and so there's no reference to ground with them anymore.

So anyways I'm going to have to see if I can find a couple of phenolic wafer style 7 pin tube sockets to match up with the original sockets and install them in place of the broken/intermittent sockets.

[Kevin Kuehn]

Originally Posted by vortalexfan

Why, am I not supposed to be getting 193 Volts there?

The sams schematic and voltage chart don't show anywhere near that voltage on those pins. Also as I mentioned before, the schematic shows the tuner b+ being fed by R13. If you had 158v on the input side of R13, and 154 on the output. There is no way for that voltage to increase on the load side, because the more current you pull thought that resistor, the lower the voltage will go on the output side.

[vortalexfan]

Originally Posted by Kevin Kuehn

The sams schematic and voltage chart don't show anywhere near that voltage on those pins. Also as I mentioned before, the schematic shows the tuner b+ being fed by R13. If you had 158v on the input side of R13, and 154 on the output. There is no way for that voltage to increase on the load side, because the more current you pull thought that resistor, the lower the voltage will go on the output side.

Maybe I mismeasured something, all i know is that I have a picture from my converter box on the TV now, and the picture is rock solid except for the picture not being centered horizontally and vertically, and no audio still.

[Kevin Kuehn]

Yeah.

[vortalexfan]

Originally Posted by Kevin Kuehn

Yeah.

Another update, I now have rock solid audio, the Audio IF was out of alignment so I fixed that, and now I have perfect audio to go with the rock solid picture.

Now I unfortunately am having issues with my high voltage again where my picture is intermittently going bright and dim, and I have a feeling it has to do with that 1 Meg 1 Watt resistor in line with the High Voltage cap for the Picture tube.

[vortalexfan]

Here's where I'm at now, see picture below. I still can't seem to get the picture to fill out the rest of the screen, as you can see in the picture below the screen for some reason won't fill out the upper right hand side of the screen, and I'm still having problems with the jailbars on the left side of the screen and the top of the screen is all stretched out looking and the bottom part is normal looking.

[Electronic M]

Originally Posted by vortalexfan

Here's where I'm at now, see picture below. I still can't seem to get the picture to fill out the rest of the screen, as you can see in the picture below the screen for some reason won't fill out the upper right hand side of the screen, and I'm still having problems with the jailbars on the left side of the screen and the top of the screen is all stretched out looking and the bottom part is normal looking.

The corner is cut off due to mechanical misadjustment (positioning) of the focus coil....play with it's tilt and your corner will come back.

Vertical not filled and non-linear: put a test pattern (in a pinch end credits with even spacing between lines when viewed on a better set will do) on screen and adjust vertical height and linearity simultaneously (may need to juggle vertical centering too)...If you can't get a full linear vertical sweep check resistors I the vertical.

The left vertical lines are probably horizontal drive lines...try adjusting horizontal drive...If that don't do it your probably going to need to adjust the horizontal osc waveform with an oscilloscope.