Flip Flop with SCR (CB6534E)

Found on a Radio Electronics this 80's circuit uses two common SCRs driving lamps. This setting appears elsewhere in this site and this section.

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Crystal Controlled Oscillator (CB6186E)
This circuit is from Signetics' 80s documentation. The circuit generates 100 kHz signals according...
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This simple digital circuit tester can work with TTL technology when powered by 5 V and with CMOS...
250 V Preamp (CB21792E)
Indicated to operate in tube circuits, this preamplifier has 250 V power supply. The circuit is...