Solution for peaky responce

[roadtonever]

I see posts up every now and then about treble responce issues, harshness, peakyness etc. There's an old post on the net written by Mr. Bill Lawrence where he among other things stated "add(ing) a series resistor of some 5 kohm to avoid some ugly narrowband resonant peaks". I didn't know what to make of that comment, thinking such a small resistor is unlikely to make any significant difference. Some time later I stumbled on a piece of product literature for Bills old OBL line:

As you can see it's a standard diagram except a 3k resistor added between the volume and tone pots. This must be what Bill talked about. To me it all implies that ol'Bill is talking about is a specialized way to make the resonant peak less narrow.

I haven't tried this myself and I may have been mistaken in my conclusions so I'm passing this on for peer-review as it were.

[JohnH]

no magic there....Putting a small resistor like that 3k, in series with the tone pot stops it going all the way to zero. At zero on a standard tone control, there is a resonant peak in the mids, which some people like (woman tone i think), so you lose that effect.

John

[JFrankParnell]

does a resistor in series like that alter the taper of the pot? Like, if you put a 100k resistor in there, you would e.g. cause 0 to become 2 on the tone dial (approximately, roughly). Is there now still a log taper on it (but now its 500-100k not 500-0k)? I'm thinking for those that rarely use the tone, it be better if 0 equaled say 4 or 5. It would give you less change per degree of turn?

[roadtonever]

May 15, 2011 15:29:53 GMT -5 JohnH said:

no magic there....Putting a small resistor like that 3k, in series with the tone pot stops it going all the way to zero. At zero on a standard tone control, there is a resonant peak in the mids, which some people like (woman tone i think), so you lose that effect.

John

So you're saying it's kind of like a simplified greasebucket mod?

[sumgai]

*must* - - *keep* - - *quiet*..........


John, where's your 5spice image of this?


(Details. That's where the Devil resides, so best to make him feel at home, right? )






sumgai