Re: Stevens ST-75 Tester first time user questions Home › Forum › Ask A Member › Stevens ST-75 Tester first time user questions › Re: Stevens ST-75 Tester first time user questions chris-pReplies: 2456Topics: 153 June 18, 2017 at 1:12 pm #59869 For the OMC condensors, the red paper top ones seem to fail more than the newer black rubber topped ones.