[Amps] AL572 for DXpedition, parts to take along

[Joe Subich, W4TV]

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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