[Amps] Tube swap

[Karel]

I still have 5 tubes, 4-1000A, 2 of them never used, 3 used ones, is there 
still demand for these?
I started an amp (2 tubes). So far I did not finish the project yet, not 
sure if I will. Perhaps if I go with 1 tube only.
Karel Ebenstreit, VA3KO

----- Original Message ----- 
From: "Hardy Landskov" <n7rt at cox.net>
To: "Fuqua, Bill L" <wlfuqu00 at uky.edu>; "Jack Taylor" <jack at n7oo.com>; 
<amps at contesting.com>
Sent: Monday, January 27, 2014 5:58 PM
Subject: Re: [Amps] Tube swap


> 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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