I have 2 of these that both test virtually the same with the same date code. This is for 1 tube but you will get a discount to buy both. The product is a vintage RCA 5U4GB rectifier tube from 1963, which is highly sought after due to its strong performance. It has been tested using a sencore mighty mite v tester and is known for its legendary black plate design. This particular tube was manufactured in the United States, adding to its collectability and desirability among vintage audio enthusiasts. Tubebx
Item Tag: Rectifier tube
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NOS Tested 5AS4A/5U4GB Rectifier Tube Strong Dual Diode Vintage Audio Guitar Amp
N/A this tube is tested on the diode scale and has to be past halfway through the red bar of the middle gauge that is red yellow and white to be good and as long as it’s past the green, it’s supposed to be NOS and this is Well into the green.
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(2) 1958 Mullard f31 Fat Base GZ34 5AR4 Tubes Matched Every Way (codes + test)
Matched codes, perfectly balanced, tested full NOS. Calibrated TV7-D/U test results: 59/60, 60/60. (Minimum/Good range on the TV7 is 40)
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1965 Amperex Bugle Boy Short Bottle GZ34 5AR4 Tube TV7 Tested @ NOS
tested and passed Emissions, Grid Leakage, and Shorts testing on my Sencore 130 tube tester Came out of my 1965 Fender Vibrolux Reverb
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Amperex Bugle Boy GZ34 5AR4 Tube TV7 Tested 95 To 100%
This is a 5AR4 GZ34 Amperex Bugle Boy Audio Tube. It has the Blackburn Factory codes of f32 B3I2. It tested strong to NOS 95 to 100% on my calibrated Hickok TV7 tube tester with scores of 59/59 matching sides. Minimum value would be 40/40 so this tube is in great shape and strong.
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Philips 5AR4/GZ34 Rectifier – DD-Getter – f32 X9F – 1959 Holland – Very Strong
Location/Date code X9F (visible on glass – see pics): X is Sittard Holland Factory, 9 is 1959, and F is June. The batch code, location/date code, tube construction, and specifications verify its identity.