The Heathkit QF-1 Q Multiplier

[@alpcns]

Happy new year! And thanks for sharing.

[@circuitblog01]

Thanks for posting and happy new year

[@rohnkd4hct260]

HEATHKIT were good radios. I remember getting the catalog in mail……and wishing I, a 12 y/o , could afford one.

[@romjone4801]

Are there any Transistorized Q multiplier devices?

[@jefftranter]

There is no reason you can't implement a Q multiplier with transistors, but by the 1960s crystal and ceramic IC filters allowed receivers to be more selective and Q-multipliers were no longer popular, so when radios went solid-state they were no longer used.