Can I put resistors back to back to add up to a larger value?

[mr.adambeck]

So, I was at this salvage place in my area called Urban Ore and happened across a small bin full of packages of old carbon comp resistors!
Knowing that they are "mojo" material, I quickly grabbed them and bought them without looking into what values they are.  Upon getting them home, and looking into it, I found that almost all of them are very low values.  I was wondering if I could put two back to back in order to get larger values that I might want, like two 820 ohm's to get 1640 ohm's, etc...
Also, having never used any "mojo" parts before, does it mess up the mojo-tastic sound if I use some carbon comp and some carbon or metal film?

Also, does anyone know any good circuits for small value carbon comp resistors? 

thanks!

[frequencycentral]

Yep, two identical resistors in series doubles the value.

Two identical resistors in parallel halves the value.

And you can also calculate mismatched resistor pairs in parallel:

http://www.sengpielaudio.com/calculator-parallel.htm

[aron]

Check out the FAQ link above

[Joe Hart]

Mojo is a cumulative situation. If you have one carbon comp resistor in a circuit, then you get a little bit of mojo, if you have two, then you get a little more, three, even more, and on and on up to Max Mojo (where ALL of the components are old, noisy, and wildly variable with tolerances). Enjoy your mojoticity!
-Joe Hart

[petemoore]

  Put the DMM to task for reading what R values you can patch together...
  I have special place in my board for R patches and jumps.