[Amps] Tetrodes

[R@contesting.com]

On Jul 9, 2005, at 1:41 PM, earl baillley wrote:

> Hi planning to swap triodes in my old 374a  with Russian bottles of 
> near
> equal dissapation. I couldn't in good concscience pay more than 100 
> bux for
> a bottle out of a VOA monster. Govt subsidized KW SS blocks havn't 
> shown up
> yet.
>
> What is the best way to supply and attach the screen volts that 
> tetrodes live by

For small tetrodes, the safest way to power the screen is through a 
high-ohm power resistor connected to the anode supply, feeding a shunt 
V regulator connected in parallel with the screen.  This configuration 
limits screen-I to a safe value during an unloaded condition, it 
protects the screen from loss of anode supply V, it absorbs potentially 
fatal reverse-screen-I, and it protects the amplifier from persons who 
are not familiar with tetrode tuneup.
>
> Thank and 73
>
> Earl W7TK
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Rich Measures, 805.386.3734, AG6K, www.somis.org