Kinescope Rejuvenator (T464E)

This utility circuit for old TV restorers was found in a Popular Electronics from November 1968.

Car Lights On Reminder (CB4786E)
This circuit was found in a 90s Hands-on Electronics. The transistor can be a BC548. What it does...
Gain 150 000 amplifier (CB6636E
) Suggested by Philips in a 1968 documentation this circuit has very high 10 ohm on-load voltage...
Voltage Controlled Low Pass Filter (CB25151E)
Based on an LM36000 OTA this circuit was found in the July 1988 issue of Radio Electronics...