Tube challenge!

Bill Layer blayer at uswest.net
Fri Nov 19 15:14:04 CET 1999


Hello All,

>With the high impedance of tubes... if you want to get "zero"
>interaction through the supply you should go separates.

Don't confuse the impedance of the tube's grid-cathode circuit with the 
source impedance of the power supply.. Tube sections are actually LESS 
likely to interact, as the currents they draw are less than similar 
solid-state devices. Assuming supplies of similar impedance (probably not 
safe :) interactions should be less.

The interaction fear stemms from the fact that it is a little harder to 
regulate a 400-600V circuit than a 12V circuit in a world of 
7812-like  devices.

In an audio circuit, it is not uncommon to have several progressive stages 
all powered off of the same supply, or at least decoupled nodes of the same 
supply.


+----------------------------------------------------------+
|      "The" Bill Layer - Frogtown, Minnesota. U.S.A.      |
| Vacuum tubes, Analog, Motorcycles and Other Alternatives |
+----------------------------------------------------------+
+---------------------+  +---------------------------------+
| <blayer at uswest.net> |  | <b.layer at vikingelectronics.com> |
+---------------------+  +---------------------------------+
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