Posted by Tnuctipun [ 172.175.155.190 ] on May 20, 2005 at 08:55:29:

In Reply to: 6S45Pi posted by Damir on May 20, 2005 at 08:13:05:

Hey-Hey!!!,
If you arrange a common cathode differential pair for phase splitting, one grid will be grounded, and signal will be applied to the other.

With the -2V of cathode-grid bias on them, the input headroom will be twice that assuming a few idealizations( like perfectly linear valves ). apply a 1V signal ( say a DC voltage ) and the cathode voltage will increase by 0.5V There will be a +/- mu/2 plate voltage change on the anodes( the input section will go - and the grounded section will go + ).

The anode-anode voltage change will be mu*input voltage. Accounting for nonlinearities, most of which cause 2nd order distortion, the actual headroom will be slightly different.
regards,
Douglas

Replies:

• Re: 6S45Pi diff pair input signal headroom - Damir 15:05:07 05/20/05 (6)
  • but, but, but... - Tnuctipun 19:10:03 05/21/05 (5)
    • Re: but, but, but... - Damir 03:00:29 05/22/05 (4)
      • so then.... - Tnuctipun 08:27:12 05/22/05 (3)
        • Re: so then.... - manualblock 19:01:52 05/23/05 (2)
          • Re: so then.... - Tnuctipun 20:08:29 05/23/05 (1)
            • Re: so then.... - manualblock 06:37:01 05/24/05 (0)