Vacuum Tube Decade Counter
Sun, 2010-02-07 16:22 — panjiabe
Donor: David Coahran
From Stone's notes: Decade counter - 30 pins in top; every third one represents a digit. To increment the count, do successive lowering and raising volting on the pins adjacent to the digit pins: n n+1 * o o * low high low high low high Head of tube projects through numbered bezel - lighted dot identifies digit.
