2x TV7D/U RE-Tested NOS/NIB 1963 RCA 5687 Bronze Nickel Plates Ring Gtr Tubes

Description: Dan Nelson Calibrated TV7D/U Tested Two(2)=One Pair, NOS/NIB Date Matched Jan.1963 RCA 5687 DOUBLE TRIODE Vacuum Tubes Made in the USA Early Red/Orange inked '63 04' & '63 04' = Jan 1963 , very faded but legible - Plates were factory coated with Thoriated Nickel & Tungsten. Before burn-in plates appear as Black Plates however after some hours the Nickel turns rusty-bronze in coloration then latter a golden hue in color. - Thick Copper & extra Steel Support Rods - Two thick Spiked Mica Wafer/Spacers - Angled Ring/Halo '0' Getter Both Tested Vintage RCA Factory Strong for Transconductance(Gm) and Plate Current Emissions(in mA) Condition: Plug-In and Play. We Opened the boxes & cleaned the pins to RE-TEST them. still UNUSED NOS/NIB condition. Test Results( See pics ) : NO Shorts, No Gas, No Leakage, No Apparent Microphonics detected Minimum Good when tested on a TV7 is a meter reading of 38/38= 4,750 uMhos Transconductance(Gm)Average Factory new NOS = 80/80 = 10,000/10,000 uMhos Transconductance(Gm) at 29.5/29.5 mA Emissions Tube 1 : Red/Orange Inked '63 04' (Gm Plate match at 4.34%) Plate 1 : 79.4 = 9,925.0 uMhos Transconductance(Gm) at 37.8 mA Plate Current Emissions Plate 2 : 83.0 = 10,375.0 uMhos Transconductance(Gm) at 39.9 mA Plate Current Emissions Tube 2 : Red/Orange Inked '63 04' (Gm Plate Match at 1.36%)Notes : This is the strongest tube in our current inventory of 100+ vintage 5687 tubes we have recently tested from several Military Surplus tube lots of 5687's recently purchased made by RCA, Tung-Sol, GE & Sylvania. Plate 1 : 94.4 = 11,800.0 uMhos Transconductance(Gm) at 38.3 mA Plate Current Emissions Plate 2 : 95.7 = 11,962.5 uMhos Transconductance(Gm) at 40.4 mA Plate Current Emissions The Red/Orange is still legible (see pics) however it is fadingBoth tubes ship in there original RCA 5687 boxes as shown -You will receive a printed copy of this detailed desc. including test results in the well packaged box shipped Our Test Bench: Tested on a Dan Nelson Restored, Upgraded( Digital Meter reads Gm&mA) & Calibrated( 07/24/2023) Mil-Spec'ed TV7D/U . Calibration Re-Verified 01/03/2023 & 06/07/2024 Tube Creator (1948) is TUNG-SOL 5687 'Bogey' (Tung-Sol Data Sheet for 5687 Values dated May 1st 1952 ) Data Sheet reference (change dot to a period '.' in the links below) :Tung-Sol Data Sheet (comprehensive with Graphs) : frank dot pocnet dot net/sheets/127/5/5687 dot pdfRCA Date Sheet (dated 4-1959 ) : frank dot pocnet dot net/sheets/049/5/5687 dot pdf Three 'Bogey' values='Average Factory New' Tube Values given in Data Sheets, results depend upon the Plate Supply Voltage Given to the tube under test. TV7's test this tube at *150V Plate Supply.Plate Supply Voltage: 120V (150V*) 180V 250VTransconductance(Gm in uMhos): 11,500 10,000 8,500 5,400Plate Current emission(in mA) 36.0 29.5 23.0 12.0 WE PACK VERY WELL FOR SAFE SHIPPING AND SHIP FAST.MANY YEARS EXPERIENCE SHIPPING FAGILE TUBES, ELECTRONICSAND SPEAKERS. WE SHIP WORLDWIDE eBay InternationalSHIPPING TO ALL US 50 STATES, US TERRITORIES, APO/DPO/FPO & PO BOXESUSPS GROUND ADVANTAGE LOW COST.

Price: 49.95 USD

Location: Miami, Florida

End Time: 2024-12-01T15:36:23.000Z

Shipping Cost: N/A USD