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Title: What is the effect of changing the cap on the Presence pot Post by: pine on April 28, 2009, 12:36:08 PM I noticed there is a 1uF 25V cap in there, and it is connected to the 4 ohm tap. On the ampgarage forum I read that someone changed the cap on his Bluesmaster presence control from a .1uF 250V film cap to a .47uF cap and got good results, getting rid of a high-mid spike. My OTS already has a higher value cap than that in there, but if I tripled it's value to a 3.3uF would I see similar results? Has anyone tried this? I am also interested in the effect of moving the NFB to the 8 Ohm tap, if anyone has experimented.
Title: Re: What is the effect of changing the cap on the Presence pot Post by: mcinku on April 29, 2009, 08:10:47 AM Smaller the cap more spike you will notice...
Presence cap bleeds off the hi frequencies in the NFB to ground... smaller the cap less hi end goes to ground = more spike something like that ;) |