Paul, I don’t understand this. The blower surely isn’t in series with
HV primary. How could that work?
73,
Jim w8zr
Sent from my iPhone
> On Dec 28, 2022, at 8:13 PM, Paul Christensen <w9ac@arrl.net> wrote:
>
>
>>
>> "If you have an old Henry, when switching to 240 without the required
>> neutral available you simply add a jumper to the terminal strip that ties
>> the primaries together to the terminal looking for the neutral. That makes
>> everything happy and is safe and legal. "
>
> That's a good solution and it's a common method used with several other amps.
> It's a bit trickier with the Alpha 70/77 series because ETO deliberately
> designed the blower in series with the HV primary. As power demand
> increases, primary HV current increases, resulting in dynamically faster
> rotational blower speed. To preserve that characteristic, I ran 4-wire
> service to the shack.
>
> Paul, W9AC
>
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