[ARC5] 10 meter BC-454 - yet more

[Geoff]

I doubt you could duplicate a full remote cutoff as the variable spacing of 
the grid wires is what determines that. I would call it pseudo or quasi at 
best.
Less variable for the semi and equal for the sharp.

Carl

----- Original Message ----- 
From: "Bill Fuqua" <wlfuqu00 at uky.edu>
To: "Ian Wilson" <ianmwilson73 at gmail.com>; "ARC-5 List" 
<arc5 at mailman.qth.net>
Sent: Tuesday, February 05, 2013 1:18 PM
Subject: Re: [ARC5] 10 meter BC-454 - yet more


>   You know, not that anyone would actually do it, you could make just 
> about any
> sharp cutoff tetrode or pentode function as a remote cutoff tube using 
> this technique.
>
> 73
> Bill wa4lav
>
>
> At 10:41 PM 2/4/2013 -0800, Ian Wilson wrote:
>>The 6AC7, according to the data sheet, is either sharp cutoff or remote
>>cutoff depending on how you control the screen grid:
>>
>>*When a fixed screen voltage is used, as shown in condition 1, a
>>sharp-cutoff*
>>*characteristic is obtained.*
>>*
>>*
>>*When a screen resistor is used, as shown in condition 2, an extended 
>>cutoff
>>*
>>*characteristic is obtained which may be utilized in applications where 
>>the*
>>*gain is controlled by variation of the grid bias.*
>>
>>(GE data sheet).
>>Condition 1: 150v fixed screen voltage.
>>Condition 2: 60k screen resistor to +300v.
>>
>>73, ian K3IMW
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