|
With the set operating using the reformed caps, I measured the main supply voltages and also the amount of ripple on each:
Supply Measured AC Ripple
+275 272 110mV
+135 128.6 18mV
-2 -2.3 4.5mV
-18 -19.9 40mV
+300 298.4 8.07V
+280 278 131mV
+350 331 8.5V
-100 -101 112mV
This was with 120VAC into the set.
To see what affect using all new caps in place of the electrolytics would make, I restuffed the three reformed caps. Before I removed the reformed caps, I made one last measurement of them with the Sencore LC75:
Cap Val@Volts Val ESR
C220 40@450 36.7 2.07
10@450 10.5 3.14
80@150 58.2 2.05
C221 40@450 42.3 2.08
40@450 39.2 2.36
10@450 11.1 3.95
C222 80@450 61.2 2.35
50@50 42.1 2.34
In the restuffing process I noticed that two of the three reformed caps had a very small(at most a dozen drops) of liquid electrolyte in them, while the third was barely moist. The three open/bad electrolytic caps that I restuffed earlier were all dry. Here are readings of the same supply voltages with the three reformed caps restuffed:
Supply Measured AC Ripple
+275 273.4 85mV
+135 129.4 12mV
-2 -2.3 1.2mV
-18 -19.9 13.4mV
+300 298.4 5.8V
+280 279.1 97mV
+350 331.8 8.4V
-100 -101 103mV
This was also with 120VAC into the set.
Attached is a picture of the same test pattern after the last electrolytics were restuffed. I can not see much, if any, difference even though the power supply ripple voltage are btter. The set does need a full alignment as the sound is weak and off frequency from the picture tuning.
Last edited by Zenith6S321; 02-16-2015 at 06:32 PM.
|