[Amps] gettering question

Bob K6UJ k6uj at pacbell.net
Wed Mar 28 11:58:13 PDT 2012


OK, I knew one band was a problem.  I will avoid 12M just to be safe.  
I worked so hard on my baby I don't want to chance screwing her up, hihi.

thanks, 
Bob
K6UJ



On Mar 28, 2012, at 9:29 AM, Carl wrote:

> 12M is the problem band and removing 3-4 turns may move the resonance as it does with Dentrons. Since I dont use my 76PA on WARC (The LK-500ZC does well there) I havent tried it.
> 
> Carl
> KM1H
> 
> 
> ----- Original Message ----- From: "Bob K6UJ" <k6uj at pacbell.net>
> To: <amps at contesting.com>
> Sent: Wednesday, March 28, 2012 11:43 AM
> Subject: Re: [Amps] gettering question
> 
> 
>> Carl,
>> 
>> Thanks Carl,  I will be going thru it and plan to replace all the filter caps, resistors, and the electrolytic.  I got this amp in a trade
>> and although it has been converted to two 3CPX800's,  he didnt do anything else to it.  Im pretty sure it still has the original filter caps
>> so it definetely needs these replaced.
>> 
>> I have another 76CA, my daily use amp,  which I have converted over two two 3CPX800's, changed the filter caps plus the things you
>> recommended and it is running great.
>> 
>> BTW,  what WARC bands are safe to use with the Alpha 76's ?    If I remember, there is one band I should avoid.
>> 
>> 73,
>> Bob
>> K6UJ
>> 
>> 
>> 
>> 
>> On Mar 28, 2012, at 7:12 AM, Carl wrote:
>> 
>>> Id be more concerned about the PS if the filters havent been replaced. There are also a few resistors and a small electrolytic that change value/go leaky.
>>> 
>>> An hour should be sufficient as that tube appears to age well if it isnt a well abused pull.
>>> 
>>> Carl
>>> KM1H
>>> 
>>> 
>>> ----- Original Message ----- From: "Bob K6UJ" <k6uj at pacbell.net>
>>> To: <amps at contesting.com>
>>> Sent: Tuesday, March 27, 2012 11:48 PM
>>> Subject: [Amps] gettering question
>>> 
>>> 
>>>> With an amplifier that uses a pair of 3CPX800's,  like my converted Alpha 76CA,  how long should I
>>>> let it sit there heating the filaments before using,  when it hasn't been used for 2 or 3 years ?   Couple of hours, 1 day, ?
>>>> 
>>>> Bob
>>>> K6UJ
>>>> 
>>>> 
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>> 
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