Dual Bias

Dax-The-Ax · Post by **Dax-The-Ax** » Wed Aug 04, 2004 9:57 pm

I've seen some boards online that have dual bias pots. In a 50 Watter you could individually set the bias for each tube. Is there an advantage or disadvantage to doing this. If this is so great, why haven't companies been doing this for years, just curious.

Post by **VelvetGeorge** » Thu Aug 05, 2004 1:41 pm

It allows you to use tubes that aren't so closely matched. Not a bad idea if you some old Mullards that are almost close enough to use together.

Manufacturers often don't put one bias adjustment pot, let alone two. It must be cheaper to use a resistor and buy thousands of tubes in the same range. Hense, no need for bias adjustment.

George

Dax-The-Ax · Post by **Dax-The-Ax** » Fri Aug 06, 2004 11:07 am

Yeah, it did sound like a good idea,
Thanks George

Dax