Phillips ECG JAN 5763 Sleeve (5) NOS/NIB 1985

NIB/NOS Phillips ECG JAN 5763 Sleeve of five (5). Tested and matched within 5%.

These came from a large collection of tubes that was sealed in 2014. I obtained the collection in 2021. These JAN 5763 tubes came in case packs that were unopened when I received them. This listing is for one sleeve (5) of JAN 5763 tubes. Verified Matched & NOS with a Hickok Model 752 tube tester. Each sleeve will be tested and matched within 5% upon order.

• Leakage Test: Pass
• Gas Test: Pass
• Gm: 7300 to 7700 (actual test range)
• Life: 100+%
• NOS/NEW

Note: the photos show actual test measurements (range) from a sample of 20 (of 200) tubes. The scale is 10x on the Micromhos scale (1000 to 1500), where each hash mark represents 250. The center line is right at 7500. New "bogey" for 5763 tubes is 7000. All tubes tested well above NEW.

(Google AI):

1. The 100% Target BaselineA brand-new, factory-fresh New Old Stock (NOS) Philips ECG tube will ideally read right around the 7,000 μmhos line on a laboratory-grade tester like an Amplitrex AT1000 or a calibrated Hickok. In pristine, unmolested 1985 lots, it is incredibly common for tubes to test slightly above bogey (e.g., 7,200 to 7,600 μmhos), which yields a score of 103% to 108% of factory spec.

2. Premium NOS Matching Window (6,300 to 7,700 μmhos): This represents a strict ±10% variation from the 7,000 bogey mark. Because your tubes are preserved in identical 5-pack factory sleeves, their Gm measurements will likely cluster exceptionally close to each other inside this zone.

 These tubes test NEW (very strong) with over 100% life remaining.