Ian,
Not sure if this is marketing or true: http://www.ebay.pl/itm/261881010090
RCA 5R4GY 274B Double Getter Mil-Spec Rectifier Tube, Tested #2
You are bidding on a single RCA 5R4GY double getter Mil-Spec rectifier tube.
This tube was made during WWII.
Not to be confused with the later JAN RCA version of this tube. These are the first production World War II type, with the double D bottom getters set an angles to each other in the bottom of each tube, long dull black plates, extra support rods, very dark brown base and circular top mica. This tube will rival if not outperform the famed 274B Western Electric, and they are just as scarce. All have the early type dark brown micanol base with the military markings.
This was tested on my calibrated Hickok 539C. It has been tested for shorts and gas. The tube tests very strong with readings of 56/58 Minimum is 40.
It has also been tested in the power supply of my DIY pre-amp and is dead quiet.
All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping.
Please note: The numbers given for gm are what I see on my TV-7/B or Hickok 539C. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester.
Not sure if this is marketing or true: http://www.ebay.pl/itm/261881010090
RCA 5R4GY 274B Double Getter Mil-Spec Rectifier Tube, Tested #2
You are bidding on a single RCA 5R4GY double getter Mil-Spec rectifier tube.
This tube was made during WWII.
Not to be confused with the later JAN RCA version of this tube. These are the first production World War II type, with the double D bottom getters set an angles to each other in the bottom of each tube, long dull black plates, extra support rods, very dark brown base and circular top mica. This tube will rival if not outperform the famed 274B Western Electric, and they are just as scarce. All have the early type dark brown micanol base with the military markings.
This was tested on my calibrated Hickok 539C. It has been tested for shorts and gas. The tube tests very strong with readings of 56/58 Minimum is 40.
It has also been tested in the power supply of my DIY pre-amp and is dead quiet.
All tubes are tested on my calibrated TV-7/B or on my calibrated Hickok 539C. All of these tubes have been tested for transconductance, shorts, gas, leakage and life. All tubes meet or exceed manufacturer published specifications of transconductance (Gm) for the specified tube type. All tests are tested twice - prior to the listing and prior to shipping.
Please note: The numbers given for gm are what I see on my TV-7/B or Hickok 539C. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester.
