[Amps] Alpha 78

[Roger (K8RI)]

On 8/25/2012 4:06 PM, Carol Richards wrote:
> I am using an alpha 78 with a pair of 3cx800A's  instead of the hard to get and afford  8874's.  I get about 1200w output on cw.  Not bad since the power supply only provides 2000V  and I am only able to drive it with 100w..   My question is   when I operate RTTY is it still safe to run the alpha at max output or should I cut back on the drive...This is especially important if I plan to operate a RTTY contest.

Just give it the smell test, or stick a thermocouple onto the core and 
keep track of the temp.  Bout I'd settle for about 40C rise over room 
temp as good for 24 X 7.  The hams on here who really know transformers 
probably can give a limit higher than that for the different 
transformers use in the Alphas, or at least more accurate.


73

Roger (K8RI)

>
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> Thanks,,,,
>
>
> Carol
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