Booster for preamplifier (CB6290E)

We found this circuit in a 1968 Electronics World. The circuit uses a transistor of the time providing a 16 dB signal gain with a 4 V output.

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RIAA Stereo Preamplifier (CB11479E)
This circuit was discovered in an English publication in 1979. The circuit can still be assembled with...
Indicator for previous tachometer (CB25052E)
This circuit is the digital indicator for the previous circuit and can be used with similar...
XTAL Tester (CB1517E )
This circuit tests crystals up to a few megahertz with ease. The circuit is from a 1977...