ADC 676 ()
A dual head infant stethoscope from American Diagnostic Corporation — not the vintage audio gear you expected, but the only ADC 676 that shows up in the record
Overview
Let’s clear the air right up front: if you came here looking for a vintage ADC 676 audio preamp, tube compressor, or anything with knobs, jacks, or a warm hum when powered on — it doesn’t exist. At least, not in any verifiable form. What does exist is the ADC 676 Proscope Dual Head Infant Stethoscope, a modern medical tool made by the American Diagnostic Corporation. And no matter how deep you dig through old catalogs, service manuals, or eBay listings, that’s the only ADC 676 with a paper trail.
It’s part of the ADC Proscope line, a series of clinical stethoscopes designed for reliability and clarity in patient auscultation. The 676 is specifically built for infants, with a dual head chestpiece — It’s 31 inches long, made with aluminum alloy construction (as seen across the Proscope range), and built to last in high-use environments like hospitals and pediatric clinics.
It shares the family name with other Proscope models: the ADC 660, a single head version; the ADC 670, a dual head for adult, pediatric, and infant use; and the ADC 675, a dual head pediatric stethoscope. The 676 sits in that niche where precision matters most — tiny hearts, faint breath sounds, and the need for consistent acoustic transmission. But again, this isn’t audio gear. It’s medical equipment. No tubes, no circuit boards, no frequency response curves in the audiophile sense — just carefully engineered acoustics for clinical diagnostics.
Specifications
| Manufacturer | American Diagnostic Corporation (ADC) |
| Model | 676 Proscope Dual Head Infant Stethoscope |
| Product type | Dual Head Infant Stethoscope |
| Chestpiece type | Dual head |
| Patient type | Infant |
| Tube length | 31 inches |
| Construction | Aluminum alloy |
| Packaging | 50/cs |
Collectibility & Value
As for collectibility — there isn’t any, at least not in the vintage tech sense. This isn’t a sought-after piece of audio history. It’s a functional medical instrument sold in bulk. The current market price varies by distributor: one listing shows $59.41 (CME Corp), another shows $444.00 (Integris Equipment LLC), though that higher figure appears to be a wholesale case price for 50 units (50/cs). There’s no indication of original MSRP beyond these current commercial prices, and no data on resale value, condition tiers, or collector demand. It’s not the kind of item that ages into cult status. It’s meant to be used, cleaned, and replaced — not restored, modified, or displayed.
There’s also no information on common failures, maintenance needs, or wear patterns. No cracked tubing horror stories, no tuning issues, no “recap or replace” advice. It just works — or it doesn’t — and when it doesn’t, it gets retired. That’s not a knock on the design; it’s just the reality of clinical tools. They’re built for performance, not nostalgia.
eBay Listings
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