The EICO 150 has been repaired and makes noise again.
This device realistically has a frequency response of about 300Hz to 6KHz, with some noticeable peaking in the 300-1.5KHz range. Perfect for tracing, but not a musical amp. That's not what it was for, so it is what it is.
I've also got a transistor acting like a noise junction, so that will need to be repaired later.
The radio card is from Trekster and was a free for review item: https://www.ebay.com/usr/trekster4tw7