SHINING LIGHT is Offering the Following Tube:
One Excellent RCA 5879 Tube
Lot#: M38-1,2,3,4
  • NOS NIB in Box
  • Grey Plate
  • "D" Getter
  • Date Code: 4-13
  • Tube Tests Very Strong on a Reference Digital AMPLITREX Tube Tester
  • Compare to Listings with Wording: "Test Strong".
  • What does "Very Strong" Mean?
  • We Provide Actual Test Results for the Tubes in the Listing. 
Value Added Tube
  • Pins Cleaned with Proprietary Process
  • Tube Surfaces Cleaned
  • "Plug & Play
This Sale is for One Tube.
Four Tubes are Available for Purchase.

Testing
AMPLITREX AT1000 Tube Tester
Tube Tested on an AMPLITREX AT1000 Tube Tester.
Fixed Bias.
Tube Tests as Follows:
  • Tube #1: GM [%]: 100, EM [%]: 105
  • Tube #2: GM [%]: 100, EM [%]: 111
  • Tube #3: GM [%]: 100, EM [%]: 116
  • Tube #4: GM [%]: 100, EM [%]: 116
Non H-K Leakage.
No Shorts.

Murphy's Law: 
"All Tube Testers are Wrong but Some are Useful"
The results of your tube tester may vary from these measurements.

Returns:
  • We Offer 30 Day Returns with a Free Shipping Label!
  • Returns Accepted if the Items are Returned in the Exact Same Condition.
  • The Pull Tabs on the Tube Boxes Must be in the Same Condition.
  • The Cotton must be Installed on Each End of the Tube in Each Box.
  • The Pull Tabs will be Taped so Tubes do not Fall-Out of Boxes During Shipping.
  • Carefully Cut the Tape on the Pull Tabs to Open Boxes.
  • The Lettering on the Tubes Must Also be in the Same Condition upon Return.
  • Hold Tubes in Areas where there is No Silkscreen.
  • Tubes Must Test with the Same Results Upon Return.
Facts about Murph...
  • Dairy Farmed in Green Bay, WI until I was about 27 years old.
  • Started out my career in electro-mechanical, then Electrical Engineering.
  • Moved into Biological Engineering where I spent most of my career.
  • If you ever ate a candy bar, I might have had something to do with the quality...
  • Over the last 10 years, I have moved my spare time to repairing tube and discrete amps & receivers.
  • I like Fisher Receivers and Scott Amps.
  • I have too many tubes.
  • Statistics-driven when evaluating vacuum tubes > Certified Six Sigma Master Black Belt.
  • Testing Equipment: Two Nelson Hickok TV-7s, Two Hickok 539Bs, One Recently Acquired AMPLITREX AT-1000.
  • I have too many testers.
  • Murph really tries to to list and sell really good vacuum tubes.