VHF and UHF Preamplifier (CB8401E)

Found in a 90s Popular Electronics, this circuit uses a MAR-X to amplify signals up to 2 GHz. The circuit is quite critical.

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UAA180 VU-Meter (CB12348E)
The UAA180 integrated circuit is no longer manufactured, but if the reader finds one in a scrap...
SCR neon trigger (CB8153E)
Found in a 1967 General Electric SCR manual, this circuit uses a neon lamp to produce opposing SCR...
Current Monitor (CB5137E)
This circuit was obtained in the manual of the used integrated circuit. Equivalents may be used...