Two(2) TV7D/U RE-Test UNUSED NOS NIB 1961 Tung-Sol Chatham JAN CTL 5R4 WGB Tubes

Quantity Two(2) Date Matched Pair UNUSED NOS/NIB Vacuum Tubes Tube Type : JAN-CTL 5R4WGB (US Military/Industrial Spec’ed) Manufacturer: TUNG-SOL Electronics / Chatham Electronics Boxes : Inked to Identify US Military Contract Air Force #. Packed Date June 1961 ‘6 / 61′ Physical : Black Plates, Hanging Filaments, Very Thick Heavy Glass, Large Tan colored Ceramic Heat dissipation bases. Inked dates ’61 35’ on tube base. Condition: Date Matched Pair, Dan Nelson Calibrated TV7D/U RE-Tested at Factory Spec ‘Bogey’. Both still UNUSED NOS NIB Tung-Sol/Chatham JAN-CTL- 5R4WGB Military/Industrial Spec’ed and Graded as ruggedized. long-life and highly reliable Dual Wave Rectifier tube. Thick Glass and Tan Ceramic bases. both tubes are PLUG-IN and PLAY Condition. Please read this 1958 Tung-Sol ‘JAN-CTL’ 5R4WGB Data Sheet for FULL Description of this unique tube type : (change dot to a period ‘.’ in the link below) r-type dot org/pdfs/5r4wgb dot pdf We opened the original boxes which were semi-sealed, cleaned & sprayed the pins and retested each tube. The 60+ year old boxes are weathered as expected and several boxes we used new scotch tape to reinforce the carton to ensure that would close backup properly for safe shipping. 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 , where TV7 min good 40/40 All Tested : No Shorts, No Gas, No Leakage, No Apparent Micro-Phonics detected TEST RESULTS : Both tubes tested with matched plates at factory data sheet new levels when tested on a TV7D/U at 150VDC Plate Supply. 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 however All 5R4 Jan’s will test on Average Factory new at 50/50 . 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 tested at 5-minute warm up on the TV7D/U in this test sample 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,GYb, 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.