I'm having a problem with my DDR Radio Intimo 5430: the volume varies from station to station. What could be causing this?

I own an Intimo 5430 East German tube radio, which plays well. However, the volume varies from station to station. Sometimes the reception is very loud on one station, and quiet on another. I have to constantly adjust the volume when tuning to a station. The radio has five tubes: ECC85, ECL82, ECH81, EBF89 or…

Why does the sound on a DDR radio Intimo5430 disappear shortly after switching on (approx. 2-5 seconds)?

I bought an Intimo5430 DDR radio for €5 at a flea market on Sunday. The I/O switches on these radios, where the volume potentiometer (value: 500 kOhm) is also integrated, always break. This is also the case with this radio. The previous owner removed the I/O switch and volume potentiometer, desoldered the two power wires…