[Amps] AL572 for DXpedition, parts to take along

[Carl]

You will likely be in a 50 Hz country so consider reducing power to keep the 
transformer happy AND bring a couple of muffin fans to help keep the RF and 
PS sides happy.

Carl
KM1H


----- Original Message ----- 
From: "Jeff Kinzli N6GQ" <jeff at N6GQ.com>
To: "Alek Petkovic" <vk6apk at bigpond.com>
Cc: "amps" <amps at contesting.com>
Sent: Wednesday, April 16, 2014 5:45 PM
Subject: Re: [Amps] AL572 for DXpedition, parts to take along


> True, and if the spare parts list gets to be the size/weight of
> another amp, that might be the better option - at least then its a
> quick swap, and any parts needed are there for the taking...
>
> Although, in all reality, I have to assume that as a single-op, doing
> much more than a tube swap in the middle of the contest is probably
> not feasible, and much of these parts would only be in case the amp
> fails pre-contest...
>
> Believe me, I'm arguing myself in and out of all sorts of scenarios :)
>
> 73 de N6GQ
>
> On Wed, Apr 16, 2014 at 2:41 PM, Alek Petkovic <vk6apk at bigpond.com> wrote:
>> Starting to sound like a spare amp. :-)
>>
>> Alek. VK6APK
>>
>>
>> On 17/04/2014 5:30 AM, Joe Subich, W4TV wrote:
>>>
>>>
>>> A full set of power supply caps and the equalizing resistors,
>>> A spare set of rectifier diodes
>>> (as an alternative - consider a complete power supply board)
>>> spare set of parasitic suppressors
>>> a spare metering board
>>> The original T/R relay (in case f PIN diode failure).
>>>
>>> 73,
>>>
>>>    ... Joe, W4TV
>>>
>>>
>>> On 4/16/2014 5:11 PM, Jeff Kinzli N6GQ wrote:
>>>>
>>>> Hi all...
>>>>
>>>> I'm prepping for a trip to Africa and plan to take an AL572 (cheap,
>>>> light, dispensable, plentiful, and does about 1200w out). While I
>>>> realize there are better amp choices in terms of durability, etc. this
>>>> is the one I've chosen with the above factors in mind. It is going to
>>>> be the primary amp in an SO2R setup, and if it fails, I still have a
>>>> secondary pretty solid (Acom) amp I can put into primary. I'll also
>>>> have the QSK board installed. Over a week I'd expect to put about 150
>>>> hard hours on the amp.
>>>>
>>>> So, if you were taking the AL572 with you to a place where parts are
>>>> non-existent, and wanted to have a chance of keeping the amp online in
>>>> 100+F heat in a rugged duty cycle (fast CW, fast SSB) what would you
>>>> take? My plan is the following:
>>>>
>>>> - spare set of tubes
>>>> - plate choke
>>>> - a couple spare HV caps for the PS
>>>>
>>>> Are there other things that would be smart to take along? I'm thinking
>>>> along the lines of what's reasonable to both take along, and field
>>>> repair with - and while a spare set of tubes is marginal in that
>>>> sense, it seems to me that at least with 572Bs it might not be a bad
>>>> idea. Also any areas of the AL572 that are inherently weak?
>>>>
>>>> Anything else? I'd also be interested in hearing about any other mods
>>>> folks would suggest to strengthen the amp for the long haul (I've seen
>>>> the W8JI mods).
>>>>
>>>> Thanks,
>>>>
>>>> Jeff N6GQ
>>>> _______________________________________________
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>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
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>>>
>>
>> --
>> From sunny Binningup, Western Australia.
>>
>> Family Businesses:
>> Petkovic Air&  Gas. petkovicag at bigpond.com
>> SP Electrical. www.spelectrical.net.au
>> Hampers by Hand. www.facebook.com/hampersbyhand
>>
>> http://www.qrz.com/db/vk6apk
>> http://www.qrz.com/db/vk6ap
>>
>>
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