5Y3GT / 5Z2P GE NOS Black Plate G-D Getter Tube Rectifier Made in USA

5Y3GT / 5Z2P GE NOS Gray Plates D Getter Tube Rectifier Made in USA Funke W19 Tested – VERY STRONG - Vintage American General Electric Production Test Results: Tube tested on Funke W19 Tube Tester: Test Conditions: Va = 100V ; Vf = 5V 100% Average: Ia = 77.5 mA Test Result: VERY STRONG Tube : Section 1: Ia = 90 mA Section 2: Ia = 87 mA Additional Tests Performed: Emission Quality: Excellent – Very strong and stable emission, without fluctuations. Short Circuits and GAS: Absent. Description: This General Electric 5Y3GT NOS, manufactured in the United States in the 17th week of 1958, is an authentic American rectifier from the golden age of tube production. The construction with gray plates, characteristic D getter, GT bulb and octal base reflects the robustness and construction accuracy traditionally associated with General Electric tubes. The test performed on the Funke W19 detected values of 90 mA and 87 mA, both clearly above the 100% average. The result confirms a very strong, stable, and even emission, particularly significant for a tube produced over sixty years ago and preserved in excellent electrical condition. The difference of only 3 mA between the two sections also highlights an excellent internal balance, an important feature for achieving uniform rectification and reliable power supply operation. Additional checks confirmed the complete absence of short circuits and gas. The 5Y3GT is a full-wave rectifier used in the power supplies of numerous guitar amplifiers, radio devices, hi-fi systems, and vintage tube electronics. It can also be used in equipment designed for the equivalent 5Z2P rectifier, after verifying the manufacturer's specifications. The original markings GE Electronic Tube, the EIA code 188 and the production code of 1958 clearly document its American General Electric origin. A NOS tube that combines proven origin, fine vintage construction with a D getter, emission well above average, and well-balanced sections: a quality choice for careful restorations and compatible tube equipment. Condition: Condition: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection. Functionality: Perfectly operational. Aesthetic condition: Very Good – Markings clearly legible with slight signs of age. See photos for details. Manufacturing Code: 58-137 188 → RMA/EIA Open Date Code → manufactured in the 17th week of 1958 - 188 → General Electric Company, Syracuse 1, N. Y. Discover why our tubes are different →