TRANSISTOR MUSEUM ™ Historic Transistor Construction Project Germanium Power Transistor Audio MiniAmp
	THE ORIGINAL AMP The schematic of the 1956 amp is shown above. There are four germanium transistors, a technology still new to experimenters at that time. Of special note is the 2N68, which had just been introduced by Sylvania as a “PNP medium gain, high power transistor for moderate frequency applications”. What this meant was a maximum of 4 watts output (using the massive metal heatsink for heat dissipation) at a frequency of 400 kc (yes that’s kilocycles). This was “state-of-the-art” for 1956 germanium power transistor technology. The three front-end transistors were all from the well known Raytheon CK722 series, and best results could be obtained by “hand selecting” individual transistors. Go To Penfield MiniAmp - Page 4
COPYRIGHT © 2004 by Jack Ward. All Rights Reserved. http://www.transistormuseum.com/ PAGE 3