TV7D/U RE-TEST 1944 KEN-RAD VT-231 JAN CKR 6SN7GT SMOKED Tube

Description: ** Price reflects the Scarcity and Quality of this Tube type ** *** QUANTITY ONE(1) Vacuum Tube ****** TEST RESULTS Listed Below and Shown in PICS Listed *** ONE(1) 1944 Production 'N4' KEN-RAD (Kentucky Radio Corp) VT-231 JAN CKR 6SN7GT (US Military WW2 Contract Production)Vacuum Tube with Very Dark Smoked Black Glass and Thoriated Black Plates, Thick Copper Support Rods, Rectangular top Mica Spacer/Wafer with Rounded Edges , Bottom side Hexagonal Metal Foil Strip with centered Dimple Getter,- Very Strong Plates Transconductance(Gm) & mA emissions. Condition: USED Tube, Plug in and Play ready, Clean pins, locator, firm phenolic baseDan Nelson Calibrated TV7D/U Re-Tested STILL STRONG with LIFE. RE-Tested at 150VDC Plate Current.Pulled From Bulk Packed Lot Military Surplus large lot purchase, so NO BOX availablehowever we Pack very well for Domestic and Worldwide Shipping TV7D/U Test results : NO Shorts, No Leakage, No Gas, No Apparent Micro-Phonics detected, NOR inter-electrode Hum detected. TV7D/U Meter Reads 82.4 / 106.3 Transconductance(Gm) = 2,060.0/2,657.5 µΩ (uMhos = microohm's) at 11.4/16.5 mA mA Anode Plate Current emissions, Notes: ** Not well Balanced but its a Strong Tube with Life 'Bogey'=Tung-Sol / KEN-RAD Factory new tube Reference (see pics of the data sheet): When tested at 150VDC Plate supply Volts on a TV7 tester the Meter reading for Transconductance(Gm)=88/88 =2,200/2,200 uMhos at 10.0/10.0 mA emissions) is the average Factory new tube 'Bogey' for a VT-231 6SN7GT tube. TV7 Minimum good/consider replace Gm = 50/50 = 1,250/1,250 uMhos Gm Physical Characteristics:- The 6SN7GT is a Low-Mu 20/20 (Amplification factor)- and is the Predecessor to the 12AU7 tube)- T-9 Glass Bulb- Twin/Double TRIODE Vf: 6.3 If: 0.6 Ampere Vacuum Tubes- Silver Inked on Black Micanol/Phenolic base "KEN-RAD" "Made in USA" "VT-231" "JAN-CKR-6SN7GT" 'P4'=Production dated 1944- Glass etched "6SN7GT" inside Octangle 'Stop Sign'- 85%+ Black Smoked Glass, 15% Silver flashing on glass- Thoriated Dark Charcoal Black Plates- Thick Copper support rods- Bottom six-sided hexagon foil strip with centered dimpled Getter- Made by KEN-RAD (Kentucky Radio Corp.) in Owensboro, KY. USA- This tube type is frequently known as (aka' Black Tuxedo Beauty') Notes: We combine Shipping! We currently have 4 of these available, Please see our other listings, Each tube is lightly marked in removable( water & napkin ) Black Sharpie ink on glass top. Inked # 1 through #4 in order of our testing this set of 4 tubes, This tube is inked #1 Recent Dan Nelson Restored, Upgraded( Digital Meter & Solid State Bridge) & Calibrated* 07/19/2023) TV7D/U Tested Calibration reverified 01/03/2024 & 7/06/2024. History Notes on Vintage Tubes Factory Matching of Plates : For Entertainment , replacement and general release as an OEM supplier to Hifi , Console and TV manufacturers at <=10% matching plates would pass QA inspection for release and sale. For Military contracts and Special Commercial Manufacturers of High-Quality Lab and Medical Diagnostics testing equipment Customers such as Tektronix, HP tube manufactures would release tubes at <= 5% matching plates..and if less than 5% would color code the glass tips (Red, Yellow, Green, White forspecial meaning such as low microphonics.Some special Military Avionics contracts specified a <=3% plate match and in some cases the Manufacturer changedthe tube type designation if required a Factory Match of <=3% plate match with sustained burn-in time( i.e. Tung-Sol 6SL7GT version changed to a --> 6SU7GTY tubes with special low-lossbases and inter-electrode ruggedization ) - Full Test results above and in pics listed- We pack very well for safe domestic & International shipping. Condition: (see all pics) Clean Pins and locator, plug in a play condition.This Tube is UNUSED. RE-Tested very strong with Balanced plates.Tube was found in a bulk pack from a recent military surplus lot.TV7 RE-Tested against the TUNG-SOL factory data sheet 6SN7GT (ca. 1945).All TV7 versions test at a max of 150VDC Plate Supply Voltage and 135Volts on the Screen supply voltagewith Control Grid#1 (Bias) from 0 to -35Volts. You will receive a printed copy of this full description with Test results in the box shipped. *** WE COMBINE SHIPPING on Multiple Tube Purchases which SAVES $ on Shipping Cost WE PACK VERY WELL AND SHIP VERY FAST (within one day or same day) USA Ship : All 50 States and Territories, ALL PO Boxes( APO,DPO,FPO,xPO boxes we ship!)low cost USPS 1-Class (now called USPS Ground Advantage however box goes Air-Freight Space Availablemany times if distance is far from South Florida at same low cost) International : Via Ebay "Improved" International Economy Space-Available Air-FreightLow cost International shipping via eBay International Economy small package Service space available AIR-FREIGHTInsured, Guaranteed Delivery.(Allow 10 days to 5weeks for delivery depending upon which World region box is delivered to). North America's and Europe are fast( 8-15 days)ASIA 2nd fastest. Austrialia /NZ / Pacific Islands about 3weeks delivery. Notes : Shipping International Delivery Times have improved, Last 2 boxes shipped to Australia(Melbourne & Sidney)15 -17 days delivered from South Florida postal drop - NO A/I Used in our Detailed Descriptions, just Honest Communications THANK YOU FOR Looking!

Price: 79.95 USD

Location: Miami, Florida

End Time: 2025-02-02T19:16:47.000Z

Shipping Cost: N/A USD