[Amps] Tube swap

[Hardy Landskov]

In addition to Bill's list, it will take about 30 to 40% more drive. Been 
there, done that.
GL Hardy N7RT


----- Original Message ----- 
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: "Jack Taylor" <jack at n7oo.com>; <amps at contesting.com>
Sent: Monday, January 27, 2014 1:57 PM
Subject: Re: [Amps] Tube swap


>    Yes and no.
> 1. The 4-1000A is taller so the chimney may not fit.
> 2. The 4-1000A in grounded grid will require more plate voltage to achieve 
> the same output.
> 3. The input impedance of the 4-1000a is a bit higher so you may have to 
> make some changes to your input matching ckt.
> 4.  The control grid pin needs to be grounded as well as screen grid pins.
> 5.  The output Z of the 4-1000A is higher but not so much that most plate 
> tank circuits can't deal with it.
> 73
> Bill wa4lav
>
> ________________________________________
> From: Amps [amps-bounces at contesting.com] on behalf of Jack Taylor 
> [jack at n7oo.com]
> Sent: Monday, January 27, 2014 3:51 PM
> To: amps at contesting.com
> Subject: [Amps] Tube swap
>
> Am in the process of bringing back to life a RF 102A.  Should the 3-1000Z
> turn out to be defective, can I directly
> interchange it with a 4-1000A?
>
> Jack - n7oo
>
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