Explorer for all ranges (T1098E)

This circuit was found in a Radio Craft from October 1946. Power supply not shown, and tubes are 1.5V filament types.

Programmable Code Switch (CB18772E)
This circuit is from a 90's publication but uses components that are still common in our market....
450 MHz Preamplifier (CB20270E)
This RF preamplifier for the 450 MHz band was found in an amateur radio documentation from the...
Schmitt Trigger 7400 (CB22419E)
This low hysteresis circuit was obtained from old documentation. The circuit must be powered by a...