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Changes in capacitor values - from schematic [message #25978]

Fri, 03 March 2017 22:47

Saransk
Messages: 20
Registered: February 2017
Location: Northern Virginia

Junior Member

I'm currently working on a PC1500 from the "garage sale" K100C-8 that had very low volume and a "funky" volume control corcuit
What I've discovered is that, so far, every 100uf capacitor on the schematic (C1501,C1506) and I suspect the matching ones on PC1400, are all 33uf capacitors.
This appears to be factory installations, either due to size, or costs. A couple of the film capacitors are also different values, such as the .15uf input capacitor is actually .47uf.
On both boards (1500 & 1400) the 10uf output capacitor had the positive leg on the power amp side of the connection, reversed from the schematic

Not sure if any of this makes a difference, but I can't help but feel the higher power buss caps might make it quieter. What about the polarity direction of the output coupling capacitor. As it is primarily for DC blocking I suspect it makes no difference.

Should I be concerned about the difference between what was built, and the schematic?

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[Message index]

		Changes in capacitor values - from schematic By: Saransk on Fri, 03 March 2017 22:47
		Re: Changes in capacitor values - from schematic By: chicagobill on Fri, 03 March 2017 23:56
		Re: Changes in capacitor values - from schematic By: Saransk on Sat, 04 March 2017 00:06
		Re: Changes in capacitor values - from schematic By: stevem on Mon, 06 March 2017 06:06
		Re: Changes in capacitor values - from schematic By: Saransk on Mon, 06 March 2017 09:12
		Re: Changes in capacitor values - from schematic By: stevem on Mon, 06 March 2017 13:00

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