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One(1) TV7D/U Tested Strong NOS/NIB 1964 GE JAN CG 5R4GYA Tube Hanging Filaments

$ 10.56

  • Application: Vintage Radios & Power Supplies
  • Brand: GE - General Electric Military
  • Country/Region of Manufacture: United States
  • MPN: JAN CG 5R4GYA
  • Model: GE JAN CG 5R4GYA
  • Status: Strong TV-7 Tests
  • Type: Full Wave Rectifier

Description

Quantity ONE(1) Vacuum Tube Manufacturer : GE - General Electric Tube type : Military GE JAN CG 5R4GYA Condition: Open Box and Re-Tested on a Dan Nelson recently Calibrated TV7D/U as a strongly balanced tube 54.6/54.7. Clean Glass, Pins & Locator, Plug in and Play Condition. The Original Mil-Spec'ed '7/64' inked very weathered 60 year old box is seen in pics. We have used scotch tape on the closing lids and sides of the box to ensure safe shipping. This tube matches the tube box. Physical Characteristics : - Hanging Filaments - Heavily coated Black Thoriated Twin Plates - Brown micanol/phenolic low-loss base, - inked "Made in USA" GE logo, "JAN-CG-5R4GYA", "64-25" Please read this tube type 5R4GYA Data Sheet for FULL Description of this unique tube type : (change dot to a period '.' in the link below) frank dot pocnet dot net/sheets/127/5/5R4GYA dot pdf Our Test Bench : TV7D/U Restored, Enhanced & Upgraded( Digital Meter) by Dan Nelson Calibrated( 07/24/2023). Calibration re-verified on 01/03/2024 & 6/07/2024. Minimum good TV7 meter reads 40/40 per side which is 60-65% of factory average new. 'Bogey' = A verage factory new 50/50 min good 40/40 Tested : No Shorts, No Gas, No Leakage, No Apparent Micro-Phonics detected TEST RESULTS : This tube tested with matched plates at 54.6/54.7 with only a 5-minute warmup time when tested on a TV7D/U at 150VDC Plate Supply. where min is 40/40. Testing Notes: we just completed testing several large military surplus lots of tube type 5R4's (over 50+ tubes) all JAN's made by Chatham, Tung-Sol, RCA, Raytheon & GE. The Heavy Thoriated Black Plates on these Jan 5R4 types do need and will need some hours of In-Service time before reaching there maximum potential for Transconductance( Gm) reading. Our 5min warmup Test barely warmed up these JAN type 5R4s so the test results seem lower than a standard dual-wave rectifier such as 5U4G, 5Ar4/GZ34,5Y3GT, EZ80-81 6CA4,6X4 ect) which when factory new is a TV7 reading of 60/60 . The heavy thoriation on these 60+ year old tubes that have not been used nor tested need in-service time so the thorium can recoat the plates. We tested this theory by installing a 1961 Tung-Sol JAN CTL 5R4WGB that came from a factory sealed box so we know is was unused. We installed and tested at 5-minute warm up on the TV7D/U and it tested at 51.0/55.0, then we let the tube 'cook' in the tester for a couple hours and the retest was about 20% higher Gm reading and the tube then showed the plates balanced very closely..this is our experience with the JAN 5R4's (GYA,WGA & WGB's). Published TV7 Settings (ca. 1962): 5R4 Vf= 5.0V JS0-6000 Bias=0 Shunt=39 Range =A Gm Button =7 Min. Good =40 Plate #1. 5R4 Vf= 5.0V JS0-4000 Bias=0 Shunt=36 Range =A Gm Button =7 Min. Good =40 Plate #2. WE PACK VERY WELL AND SHIP FAST TO OVER 100 COUNTRIES WORLDWIDE MANY Years of Experience shipping fragile electronics, speakers and Vacuum Tubes. US Shipping to All 50 States & US Territories + APO/DPO/FPO/xPO & PO Boxes International via eBay International Shipping Center - low cost space available Air-Freight with Tracking. Ebay's international ship partners are USPS International, DHL & Asendia. Allow 10days to up to 6weeks for delivery depending upon country of destination. IF YOUR COUNTRY IS LISTED IN THE DROP DOWN BOX IN THE 'SHIPPING, HANDELING' TAB THEN WE SHIP TO YOU.