that would be a switching PS. i doubt it would be regulated enough as is t stands.. can you measure the ripple? you might build a simple cap/inductor network for it.
That':s the technical info that comes with the PS:
unfortunately in German
Ausgangsleistung: max. 70 Watt
wählbare stabilisierte Ausgangsspannungen:
15/16/18/19/20 Volt bis max. 3,5 Ampere
22/24 Volt bis max. 2,9 Ampere
sehr geringe Brummspannung (max. 150 mV)
Eingangsspannung 100-240 V AC 50-60 Hz
Abmessungen (BxHxT): 80 x 43 x 140 mm