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

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. 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 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 the niche for tiny hearts, faint breath sounds, and consistent acoustic transmission. It isn't audio gear. It's medical equipment. No tubes, no circuit boards, no frequency response curves in the audiophile sense.

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. 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 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.