Tube challenge!

Bill Layer blayer at
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 

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