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24.50.224.123
I changed the power supply electrolytics in my 60-year old McIntosh
C2entsents\\\ 2ND preamp with new caps 5 years ago. The unit was practically unused
all these years.Now I get good capacitance readings and my ESR meter also
indicates excellent readings.However,hum sound is present when the unit is
turned on. How reliable ESR readings?
Follow Ups:
Are Variac transformers reliable to increase circuit amperes,assuming
Resistance(Ohm's) is maintained constant, say at 120V?
Only real way is to LOOK at the 60/120hz ripple on the B+ as it passes thru the filtering sections (Series R's Parallel C's) and see how low it gets. Need an oscilloscope - and one that can take 300 volts or more DC without blowing up. Should see much supressed ripple as you work "downstream. Final AC ripple should probably less than a volt. Also try hooking the scope up to the line output terminals and "see" what hum is there.
try using bypass caps on the electrolytics Ron Welborne at Welborne labs wrote a lot about this.
the performance of the capacitor and the presence of hum and not interrelated.
The hum is from an open connection to ground-
Perhaps this occurred when the caps were installed?
Many of the old electrolytic caps used in McIntosh equipment were multi sectioned caps - which are not as readily available today- so how did the new caps replace the old?
Happy Listening
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