The "6SL7WGT-JAN SYLVANIA Square Getter" is a specific type of dual-triode vacuum tube, known for its 
military-grade construction (JAN spec) and high-quality audio performance, featuring a distinctive "square getter" 
at the top, black plates, and a brown base. These tubes, manufactured by Sylvania for the US military in the 1950s, 
are highly sought after by audiophiles for their clear, detailed, and warm sound with tight bass and smooth treble. 

Key features 
•	Manufacturer and spec: Sylvania, USA, made for the US military (JAN - Joint Army-Navy specification). 
•	Date: Typically from the 1950s. 
•	Getter: A distinctive "square getter" at the top of the tube. 
•	Plates: Black plates. 
•	Base: Brown base. 
•	Construction: Rugged, with features like a low-loss micanol heat-resistant base and small inverted welded plates, making it low-microphonic. 
Performance characteristics 
•	Audio Quality: Highly regarded for its sound, which is described as clear, vivid, detailed, and smooth. 
•	Frequency Response: Features tight and well-extended bass, detailed midrange, and smooth treble without harshness. 
•	Soundstage: Creates a wide soundstage where instruments can seem very close to the listener. 
•	Microphonics: Very low microphonics due to its construction. 
Why it's desirable 
•	Quality: It is considered a high-quality, special-purpose tube built to military standards. 
•	Sound: Many audiophiles consider it one of the best-sounding 6SL7 types for audio applications. 
•	Collectibility: Its specific features and military origin make it a classic and sought-after component.
                         
 Tested Advance Digital Tube Tester Amplitrex AT1000

                                       Sr.No.4369009  T1=Ip mAdc=3.1  uMhos=2200
                                                        T2=Ip mAdc=2.9  uMhos=2100



                             Sr.No.4369008  T1=Ip mAdc=2.7  uMhos=2010
                                                        T2=Ip mAdc=2.3  uMhos=1900
                             Sr.No.4369010  T1=Ip mAdc=3.1  uMhos=2200
                                                        T2=Ip mAdc=2.7  uMhos=2000
                            Sr.No.4369015  T1=Ip mAdc=2.4  uMhos=1920
                                                      T2=Ip mAdc= 2.3 uMhos=1900






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