This amplifier with the EL84 tube is a European commercial type from Corpim mounted on a printed circuit board. The diagram appeared in a September 1958 Radio Electronics magazine.
We show in the figure how to implement the No-AND or NAND logic function using a general-purpose transistor....
This circuit was found in a 1980s documentation. Modern general purpose transistors can be used....
Many collectors of records, tapes and even audiophiles often keep recordings on tapes that...