My alpha 87a was purchased as a refurbished unit in 2012. It has an external fan on the rear of the chassis, and the floating blower inside the chassis. I had not until today realized that the fan on the back is the external fan recommended for RTTY use - it came that way and I don’t recall paying a premium for it.
Regarding the fan speed selector switch, my alpha 87a does not have this switch. The internal blower and the external fan run all the time. The external fan is mounted in a location that suggests it is for cooling the power supply, and it is recommended for use on 50 Hz mains power.
If there is a different variant of the 87a without the external fan, it may be 4 dB quieter than mine as was observed for the alpha 89.
73,
Bob R
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