These two quizzes appeared 60 years ago in the August 1961 issue of Radio Electronics.

We’re confident that most of our readers can figure them out. If not, we’ll post the answers tomorrow. If these look vaguely familiar, it’s probably because you’ve seen them here before. The first “black box” quiz is very similar to a circuit we showed previously from October 1956 QST. And the second one with resistors is almost identical (only the values have changed) to the one we previously showed from the January 1957 issue of QST.

The 1961 answers (which are similar to the 1956-57 answers) will appear here tomorrow.