K8084 short circuit

Hello, I built a K8084 preamplifier but surprisingly I’m suffering a short when I connect the audio cable between the K4003 and K8084. I already checked everything but I found at the audio exit of the K8084 a DC voltage of ca. 0,25V. Can I ask anyone to help me out? Best Regards, Stijn Op de Macks from Eindhoven, NL