The tubes are a 35w4 rect. Web late 1950's american electronics company / ameco (morse) code practice oscillator (ac house current, 110 volts ac or dc, two tubes: With the aid of an.
CW Code Practice Oscillator aka CPO
It will work with any.
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Web the “code practice oscillator” is a simple to build audio oscillator designed to be used as a morse code practice oscillator. Screw terminals for phones and key. Web in this video i play with the ameco morse code practice oscillator again but this time i mess with two of the screeching tracks in post to form a nice dronin.