Hello Forum, I have a set of 1964 Altec Networks that have never been serviced. I wanted to do a ReCap on them but I wasn't sure of the best way to remove the black tar substance from them. Is there a chemical spray that will desolve it or loosen it up without damaging the circuit board? Do I just scrape it out? I fear if I try to scrape it out, I will damage something inside. It is layed in there pretty thick. Also, any suggestions on what brand caps to use? And Finally, should I look into new resistors?

Thank you for any advise.

David