The Magic Eye Tuning Indicator
Here's a short video showing examples of these old radio tuning aids, along with a simplified descripton of how they worked.

▶︎
A Grid Dip Oscillator

▶︎
Paraset - The Whaddon Mk. 7

▶︎
Using Old Cathode Ray Tubes in Projects

▶︎
3 Mistakes That Slowly Kill Your Vintage Receiver

▶︎
Inside a Secret 1940s WWII Agent Radio: The Lagercrantz Suitcase

▶︎
Why listen to an old radio?

▶︎
EEVblog 1752 - Texas Instruments SCREWED UP the NE5532!

▶︎
Electronic Mystery Machine - What Does It Do?

▶︎
Stealing Energy From Radio towers Using Plasma (ft. Geerling Engineering)

▶︎
9 Vintage Turntable Brands Ranked From WORST to BEST

▶︎
K-141 Kursk: Divers Opened A Sub Russia Said Was Empty 23 Men Were Alive Writing Letters In The Dark

▶︎
Unbelievable Smart Worker & Hilarious Fails | Construction Compilation #7 #adamrose #smartworkers

▶︎
Something is jamming GPS over Europe. Here's what we found

▶︎
WW2, MILORG AGENT RADIO - OLGA

▶︎
I Modified My Bicycle To Run Lightning Fast. Everyone Was Amazed!

▶︎
The most used operating system in the world is not Linux

▶︎
Unbelievable Smart Worker & Hilarious Fails | Construction Compilation #8 #adamrose #smartworkers

▶︎
THIS Is What Happens When You Attack a US Aircraft Carrier

▶︎
A VHF Lecher Line Oscillator

▶︎
