[Amps] Tube swap

[Karel]

How do you check if they leaked?
Should there be a whitish discoloration inside the tube?
I will check mine later next month. Right now my amp stuff in under 4 feet 
of snow here in western Ontario.
Karel, VA3KO

----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Karel" <kebenstr at bmts.com>; <amps at contesting.com>
Sent: Monday, January 27, 2014 9:17 PM
Subject: Re: [Amps] Tube swap


> People are still running HB 4X1 amps and others continue to build when the 
> tubes have been on hand for ages or can be found cheap.
>
> The big problem, even with NIB, is the seals leak and the tube slowly goes 
> to air.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Karel" <kebenstr at bmts.com>
> To: "Hardy Landskov" <n7rt at cox.net>; "Fuqua, Bill L" <wlfuqu00 at uky.edu>; 
> "Jack Taylor" <jack at n7oo.com>; <amps at contesting.com>
> Sent: Monday, January 27, 2014 8:08 PM
> Subject: Re: [Amps] Tube swap
>
>
>>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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>>>
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>>
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>