> For small tetrodes, the safest way to power the screen is through a...
What is "small"?
73, Dick Knol
PA3DUV
----- Original Message -----
From: "R@contesting.com;Measures" <r@somis.org>
To: "earl baillley" <earlbailley@centurytel.net>
Cc: <amps@contesting.com>
Sent: Saturday, July 09, 2005 11:09 PM
Subject: Re: [Amps] Tetrodes
>
> 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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>> Amps@contesting.com
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>>
>>
>
>
>
> Rich Measures, 805.386.3734, AG6K, www.somis.org
>
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