[Amps] gettering question

[Carl]

Unfortunately a GDO is not issued with a ham license so a little cut and try 
is required. The object is to park the resonance in the middle of the CB 
garbage pit.

Ive no idea where the LK-500 resonances are, it works fine so I never 
bothered.

A list of the measured L of various chokes, their resonances and 
requirements to move them out of ham bands would be a good idea.

Carl
KM1H



Carl
KM1H

----- Original Message ----- 
From: <hs0zed at csloxinfo.com>
To: "Carl" <km1h at jeremy.mv.com>
Cc: "Bob K6UJ" <k6uj at pacbell.net>; <amps at contesting.com>
Sent: Wednesday, March 28, 2012 12:54 PM
Subject: Re: [Amps] gettering question


>A little caution when 'pulling a few turns'. The choke can be resonant 
>around
> 25MHz and 'pulling a few turns' will undoubtedly raise it. The risk is 
> that it
> could become a little toasty if you use the amp at the bottom of 10m. It 
> might
> be worth making some measurements first.
>
> How is the choke in the LK-500 different from the Alpha? About where is it
> resonant? Might be useful info for reworking other amps.
>
> Martin, HS0ZED
>
>
>
> Quoting Carl <km1h at jeremy.mv.com>:
>
>> 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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