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

[vortalexfan]

OK so a little update, I powered on the set with all but the H. V. Rectifier tube removed from the TV and the TV's current draw leveled out at about .39 Amps or 7.3 watts according to my Kill-A-Watt Meter, which is fairly low.

So I'm guessing that the transformer is actually fine yet and my problem is just a bunch of paper caps that have shorted to ground somewhere in the TV (more than likely the two .01 MFD caps on the AC line for noise supression are the ones to blame because they are soldered to ground on one side and if they've shorted, they've more than likely shorted to ground.)

[Kevin Kuehn]

Originally Posted by vortalexfan

OK so a little update, I powered on the set with all but the H. V. Rectifier tube removed from the TV and the TV's current draw leveled out at about .39 Amps or 7.3 watts according to my Kill-A-Watt Meter, which is fairly low.

So I'm guessing that the transformer is actually fine yet and my problem is just a bunch of paper caps that have shorted to ground somewhere in the TV (more than likely the two .01 MFD caps on the AC line for noise supression are the ones to blame because they are soldered to ground on one side and if they've shorted, they've more than likely shorted to ground.)

I doubt the AC line caps are drawing all that current. They'd of exploded by now with unlimited AC current flowing. You can simply snip one lead of those so they are out of circuit. They are not needed for the set to be operational.

[jr_tech]

Scratches head... how does 122 Volts @ .39 Amps equal only 7.3 Watts?

jr

[jr_tech]

Originally Posted by jr_tech

Scratches head... how does 122 Volts @ .39 Amps equal only 7.3 Watts?

jr

Answer: power factor for this unloaded power transformer must be quite small, about 0.15 !

Just measured an unloaded tv power transformer of similar size on a kill-a-watt meter, readings were:
122 Volts, 0.26Amps, 9 Watts, 34 VA, 60Hz, 0.28 PF (power factor), so I believe that the PF could be as low as 0.15.
Did you happen to get a power factor reading?

jr

[vortalexfan]

Originally Posted by jr_tech

Answer: power factor for this unloaded power transformer must be quite small, about 0.15 !

Just measured an unloaded tv power transformer of similar size on a kill-a-watt meter, readings were:
122 Volts, 0.26Amps, 9 Watts, 34 VA, 60Hz, 0.28 PF (power factor), so I believe that the PF could be as low as 0.15.
Did you happen to get a power factor reading?

jr

Here are my Kill-A-Watt Meter readings for my TV's Unloaded Transformer:

123.4 Volts AC
0.40 Amperes
8.2 Watts
50.6 VA
60.0 Hz
PF (Power Factor) 0.16

Hope this helps.

P. S. depending on the time of the day my voltage readings coming out of my outlets can range between 119.8 VAC and 124.5 VAC, when I took my Kill-A-Watt Readings just now my Voltage reading was 123.4 VAC when I took it this morning it was 122.5 VAC.

[jr_tech]

So, because of the low power factor of the unloaded transformer, the .40 Amp current draw does not appear to be excessive at all. Your transformer is behaving much the same as the known good transformer that I measured and is probably good.

jr

[vortalexfan]

Originally Posted by jr_tech

So, because of the low power factor of the unloaded transformer, the .40 Amp current draw does not appear to be excessive at all. Your transformer is behaving much the same as the known good transformer that I measured and is probably good.

jr

That's good to know and is basically what I was thinking.

So it definitely means that more than likely my problem lies with some bad paper caps in the TV that have shorted to ground more than likely.
Probably more than likely one of the paper caps that I have yet to replace.
Which I have already replaced almost half the capacitors in the set already, I have about 23 more capacitors to replace in this set yet (that includes some of the electrolytics that I haven't replaced yet in the set).