01-31-2013, 04:41 PM
It shouldn't hurt anything to increase the value of the output filter cap. The transformer should not run hotter.
The extra hum was probably there all along since you did the conversion to a PM speaker; the 4 inch speaker, most likely, did not have the frequency response on the low end so that you heard it. The 6 incher obviously has a wider frequency response, so you started hearing the hum when you installed it. If the 16 uF output filter reduced the hum to an acceptable level, then you have done all you can.
The extra hum was probably there all along since you did the conversion to a PM speaker; the 4 inch speaker, most likely, did not have the frequency response on the low end so that you heard it. The 6 incher obviously has a wider frequency response, so you started hearing the hum when you installed it. If the 16 uF output filter reduced the hum to an acceptable level, then you have done all you can.
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Ron Ramirez
Ferdinand IN
