Name:    Steve Kennedy
Email:   steve@pacair.com  
Subject: Spongy sounding 112RD100 fix?
Thread:  139
Time:    Sun, 12 Aug 2001 23:52:13 UTC

Also, are you listening to the amp with the DEEP or BRIGHT switches on? On some amps, Deep is really tubby sounding.


I have seen the capacitor on the Bright switch go bad so that extra "sparkle" is missing.


Also, these amps are famous for having a Mid tone control that is only just a little higher in frequency than the Bass tone control, not at all like a more modern Mid control. A change in capacitor value in the Mid tone control circuitry can raise the frequency at which this control works, thus allowing more clarity when using this control as well as more distortion gain were it counts.


I haven't done this particular mod to mine yet so I have no specifics (but it is on my "to-do" list). I can offer a direction, however.


Look at the difference in value between C5 (.0033uF, the Treble cap) and C6 (.22uF, the Mid cap). To make the Mid control frequency higher make the value of C6 smaller (closer to the Treble cap, but not too close). I would start at .022uF and see what that sounds like.


Steve