With a 475 V supply, this amplifier published in Radio Electronics magazine in January 1958 offered good power. The amplifier used 4 tubes.
This circuit is from a Popular Electronics from April 1991. The magazine no longer exists, but the...
This two-color LED indicator was found in a Popular Electronics from the 90's. The transistor...
This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit has an...