SHINING LIGHT is Offering the Following Tube:
One Excellent TUNG-SOL 0Z4 Rectifier Tube
Lot #: N257
  • NOS NIB
  • Tube is in Very Nice Shape
  • Excellent Box
  • Date Code: KW3
Testing
HICKOK TV-7A/U
Tube Tested on the Nelson Calibrated TV-7A/U Tube Tester.
Test Results for Plate #1 & Plate #2:
  • 55/56
The Test Numbers are what NOS 0Z4 Tubes Test on a TV-7.
The Minimum Value for a 0Z4 Tube is: 40/40.

Murphy's Law: 
"All Tube Testers are Wrong but Some are Useful"
The Results on Your Tube Tester will 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 secured so Tubes do not Fall-Out of Boxes During Shipping.
  • Carefully rubber band on the Pull Tabs to Open Boxes.
  • The flashing must be in the same condition upon return.
  • 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 Hickok 6000A and One AMPLITREX AT-1000.
  • As you can see, I have too many testers.
  • Murph really tries to to list and sell really good vacuum tubes.