Posted by Tnuctipun [ 64.12.116.65 ] on April 09, 2005 at 06:42:14:

Hey-Hey!!!,
How much input impedance( variable with frequency thanks to Miller et Al ), is acceptable?

From the extreme of an amp with a 470kOhm grid leak and a pentode gain stage to a Sakuma-style 845:845 amp or step up TX coupling. The load on the linestage is going to have some effect on the sonics, and will depend on the ability of the pre to drive a difficult load.

So, where is the line in the sand, or is it a broad smudge? Of course cabling can contribute to the capacitive load on the pre....

I suppose one answer would be to use the pre which can drive anything. These are usually either complex or 'spensive.
regards,
Dogulas

Replies:

• some test results... - Tnuctipun 08:39:47 04/17/05 (1)
  • Re: some test results... - steve 21:22:50 06/01/05 (0)
• Re: amp input stage - Steve 22:49:40 04/11/05 (0)
• Re: amp input stage - Wayne Parham 09:14:01 04/09/05 (0)
• Re: amp input stage - manualblock 07:49:35 04/09/05 (2)
  • Re: amp input stage - Tnuctipun 11:58:02 04/09/05 (1)
    • Re: amp input stage - manualblock 12:31:54 04/09/05 (0)