This small tube amplifier appeared in Radio Electronics magazine in February 1958. The circuit is powered by the mains with a power transformer and output with different impedances.
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
September 2016 - It can be purchased at Mouser Electronics the new REF6000 precision voltage...
This circuit uses the well-known 8038 to generate 3 waveform signals. Frequency bands are selected by...