via this Reverb listing
Pic of the inside below.
"Heathkit AD-1013 Quadraphonic Oscilloscope | Rare 1970s Vintage | Fully Functional & BeautifulUp for sale is a rare and stunning Heathkit AD-1013 quadraphonic oscilloscope from the 1970s. This piece is fully functional and in remarkably clean condition, especially considering it’s over 50 years old.
The AD-1013 is a unique vintage unit designed for visualizing sound in both stereo and 4-channel quadraphonic modes—perfect for adding immersive, retro visuals to your synth setup, studio, or hi-fi system. It also features a built-in sine wave oscillator (20Hz to 20kHz), making it useful for testing or generating signals right out of the box.
Functionally:
• All features tested and working flawlessly
• Bright, sharp CRT trace
• Stereo + quadraphonic display modes
• Built-in sine wave generator (20Hz–20kHz)
Cosmetically:
• Front panel is clean and vibrant with no major wear
• Chrome accents are shiny with only minimal spotting
• Original knobs are in fantastic condition
• Wood cover has a few light marks but is smooth and attractive
• Reticule and brand sticker are bright and intact
• Black side panels complete the sleek vintage look
This is an incredible and rare unit that delivers both function and serious retro vibe. Whether you’re after vintage test gear, synth visuals, or a killer display piece for your studio, the AD-1013 is the real deal."
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