Date Matched Pr. TV7D/U Tested 1959 Raytheon JRP-5687 B-Plates Ring Gtr Tubes - عيادات أبوميزر لطب الأسنان

$29.95 Buy It Now or Best Offer
free,30-Day Returns

Seller Store jimcochran
(1114) 100.0%,

Location: Miami, Florida
Ships to: US,
Item: 305703141907

Restocking Fee:No
Return shipping will be paid by:Seller
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Raytheon:Raytheon
Type:Vacuum Tubes
JRP-5687:JRP-5687
Country/Region of Manufacture:United States
Unit Quantity:2

Calibrated TV7D/U Tested Two(2)=One Pair, Date Matched inked ’59’-47′ Pair Vacuum Tubes 1959 ONE PAIR JRP-5687 Military(‘JAN’) Vacuum Tubes – This pair actually has ‘Bronze Plates’ .When new they look like Black Thoriated Tungsten coated Plates however these plates were also coated with Nickel & Tungsten. After a short period of time the Nickel will turn to a Bronze color and sometime to a golden bronze hue in colorization after some hours of ‘burn in’. In the pics you can see one of the tubes plates starting the bronze coloration. – TV7D/U tested Strong for Transconductance(Gm) and Plate Current Emissions(in mA) 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 : inked “Raytheon JRP-5687” “59-47” “280”=Eia Code, Ring/Halo ‘O’ Getter Plate 1 : 71.9 = 8,987.5 uMhos Transconductance(Gm) at 33.9 mA Plate Current Emissions Plate 2 : 79.8 = 9,975.0 uMhos Transconductance(Gm) at 35.5 mA Plate Current Emissions Tube 2 : “Raytheon JRP-5687″”59-47” “280”=Eia Code, Ring/Halo ‘O’ Getter Plate 1 : 78.1 = 9,762.5 uMhos Transconductance(Gm) at 32.1 mA Plate Current Emissions Plate 2 : 78.6 = 9,825.5 uMhos Transconductance(Gm) at 32.2 mA Plate Current Emissions – Red/Orange inked “Made in U.S.A” “Raytheon JRP-5687” “59-47” “280”=Eia Code for Raytheon The ink is legible (see pics)- Both tubes found out of original boxes, purchased from a US Military surplus depot sale.- Will Ship in vintage Raytheon period correct boxes as shown in pics but not the original 5687 boxesthese tubes came in…- 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 ‘.’ ) :frank dot pocnet dot net/sheets/127/5/5687 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.

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