choosing between linear and audio taper...?

[formerMember1]

If i wanted to make a Resistor a pot mounted to the enlcosure, to adjust biasing of the fuzzface,(cuz of Germanium),

Would I use a audio taper or linear?  I assume audio taper,..

I guess i would just make it a 20k enclosure mounted pot if i choose to replace the 8.2k resistor or a 50k enclosure mounted pot if i choose to replace the 33k resistor. (i'll probably taper it with resistors, cuz i only want to keep it biased at 4.50volts, not near 5.0volts, and i would also like to bias it at 3.50volts, for sqaure wavy fizzy fuzz,(like mr. soul by neil young), so i only need to be able to go a little above 4.50volts with the pot at room temp, so i could adjust it for 4.50volts  at different gigs at avarying temp, and also a little below 3.50volts at room temp, for gigs with different temp, for that  fizzy fuzz tone.

hope that makes sense

thanks 

PS:i guess i would just put a horizontal line on the knob, for when it is biased at 4.50volts, and then turn it left or right for making it 4.50votls in different temp gigs. (kinda like the sundial from analogman, who makes great fuzzs might i add)


oh yeah, would a linear taper 2k pot, sound different than a 2k audio taper pot for the fuzz pot?  Even if i keep it maxed all the time? Or does it only affect the taper,..if not, i will probably just replace it with a resistor then cuz i never turn the fuzz pot, even with the reverse taper pot from smallbear, that does work great for what it is supposed to do,...

[bioroids]

oh yeah, would a linear taper 2k pot, sound different than a 2k audio taper pot for the fuzz pot? 

Not at all.
I would try a linear for the biasing pot.

Luck

Miguel

[Mark F]

I agree with Bioroids. I recommend that any bias pot should be linear taper as opposed to log taper as it behaves in a smooth linear fashion just as its name implies. Audio taper pots would probably be harder to adjust, as far as bias is concerned, due to the fact that most of the resistance is concentrated at one end of the pot so to speak. 

[formerMember1]

cool thanks guys, i understand that now, that makes more sense,..



that explains why i had trouble dialing in the right resistance for a Rangemaster once(when biasing) cuz one little milimeter turn of the audio pot and it would change so much, then after more turning it wouldn't change by much,

thanks again!!

[petemoore]

4k7 + 10k
  4k7 fixed R series with a 10k pot gets a good range for biasing FF Q2's.
  4k7 is about as low as I'd want to go [I'd start searching for another Q for Q2], and 14k7 [some Si FF schematics show 18k there IIRC] is a good range, that's what I used for my top mount FF bias knob, and I do twist that one, the sound changes from a little grittier to more open.
  Anyway you can change the fully Cw to CCw range of resistances by using a stop resistor like that. Makes it easy to find the sweet spot. as does a linear pot.

[formerMember1]

 that sounds good,  except i will be using the mayer mods, so my value will be different, but i understand the concept,...

thanks petemoore!!   


PS:i am not sure if i am gonna make the "33k" or the "8.2k" an external mounted bias pot.  I will see what works out better, and post up.