SHINING LIGHT is Offering The Following Tubes:
Two Excellent RCA 12AT7 Tubes 
Lot#: F156
  • NOS NIB
  • Matched Construction
  • Grey Plates
  • "O" Getters
  • Discriminating Test Results from a Nelson Calibrated TV-7. 
  • Date Codes: AN, Cannot Read Other Tube
  • Tube Lettering is Showing Some Age.
  • Tube Boxes are in Good Shape for Age.
Value Added Tubes
  • Pins Cleaned with Proprietary Process. 
  • Tube Surfaces Cleaned. 
  • "Plug & Play"
Testing:
HICKOK TV-7A/U
Tubes Tested on an HICKOK TV-7A/U Tester
Test Results as Follows:
  • Tube #1: 69/76: 90%/99% of Calculated NOS Avg.
  • Tube #2: 71/76: 92%/99% of Calculated NOS Avg.
  • No Shorts
The Calculate Average for a NOS 5670 Tube is: 77/77.
The Hickok Specified Minimum for a 5670 Tube is: 50/50.

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.
  • My Favorite Speakers are Acoustic Research AR-2ax and Classic 30s.
  • 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.