Phone preamp

I have a K2573 which is working fine in combination with the 8020/ 8040 kit.
Having replaced this set with a Dared MP15 tube amplifier the phono preap doesn’t seem to wrok anymore.
The signal looks very weak and if I turn up the volume, the amp goes in overload.

Any suggestion what could be the case or any mod I have to make ?

Thank you for you kind attention.

This information does not allow us to help in solving this problem.
Maybe the input impedance of the tube amp is too low, so it loads the phono preamp ?

Sorry for late reply.
I got the data but they are in Ducth, I guess that’s no problem.

Max. Vermogen: 2 x 18W
Frequentiebereik: 20 Hz – 20 kHz +/- 1,5 dB
Vervorming: >= 2%
Signaal – Ruis verhouding: >= 86 dB
Ingangsgevoeligheid: 230 mV
Ingangsimpedantie: 100 kOhm
Uitgangsimpedantie: 4/8 Ohm
Afmetingen: L 340mm B 290mm H 160mm
Gewicht: 11 Kg
Buizen: KT94 x 2, 6N3 x 4, 6E2 x 1

Thank you.