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1 NIB & Balanced RCA 6BL7GTA HiFi Audio Tube BLACK plates SIDE "D" Tests GOOD, US $220 – Picture 0
1 NIB & Balanced RCA 6BL7GTA HiFi Audio Tube BLACK plates SIDE "D" Tests GOOD, US $220 – Picture 0

1 Nib & Balanced Rca 6bl7gta Hifi Audio Tube Black Plates Side "d" Tests Good

US $220

  • Elkhorn, Wisconsin, United States
  • Jun 10th
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Slightly used but balanced with box RCA 6BL7GTA Twin triode tube.  Features black plates and a side "D" getter.  Tests STRONG.  Results:  6,200 / 5,900.  Minimum for this type tube is 3,500 and 7,000 is considered NEW. All checked tubes are tested for shorts/leakage, emissions (mhos) GM measured DIRECTLY in micromhos, plate current (mA) read digitally, and gas/grid current.  A voltage line adjustment is made after every test for best accuracy.  All used tubes will come in white, individually labeled white boxes with recorded emissions and automatically tested plate current ( if applicable).  Matched tubes are within the accepted 10% read value.  All testing is done on a Triplett 3444 quasi-laboratory tube analyzer designed to provide high resolution results for demanding applications.  My particular tester was rebuilt in July 2014 by C.G. Industries using military / industrial precision parts and FULLY calibrated to the exact specifications of the assembly line master model.  All tubes will be shipped with utmost care to insure safe delivery.   I offer a 14-day unconditional guarantee on all tested tubes.  I HAVE SOLD THOUSANDS OF TUBES TO HAPPY CUSTOMERS.  PLEASE CHECK OUT MY FEEDBACK.  NO DISAPPOINTMENTS. Thank you! *NOTE* I've noticed a vast majority of tube sellers on Ebay NOT listing plate current (mA) when trying to match power tubes.  Remember that this reading is much more important than emissions (mhos) when trying to MATCH tubes.   Tubes can have perfectly matched emissions while the plate current is way off.  This is not good because if you can't adjust the bias current, one (or more) tube(s) will run hotter (or cooler) putting undo stress on your amplifier.  That's why it is highly recommended to replace both tubes even if only one fails.  My tester automatically reads plate current (digitally) and I will include that number when applicable in my listing.  Again, this applies a lot more to power tubes such as 6L6, 6V6, 6CA7, 6550, 7027, etc.  than non-power tubes.  

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