SHINING LIGHT is Offering the Following Tube:

One Excellent GE 6GU7 Tube 

Lot #: N703

• Compare to Other Listings > Not Close...
• NOS NIB
• Long Grey Plates
  
• "O" Getter
• Cu Grid Rods
• Fully Vetted on Two Reference Tube Testers Shown Below.
• Date Code: JN

Testing

HICKOK TV-7B/U

Tube Tested on a Reference HICKOK TV-7B/U Tester

Tube Tests as Follows:

• Reading: 97/96: 154%/153%

The Calculated Average for NOS GGU7 Tubes is: 63/63.

The Hickok Minimum for a 6GU7 Tube is: 41/41.

The HICKOK Minimum is Defined when a Tube has 65% of it's Life Left.

AMPLITREX AT-1000

Tubes Tested on a Digital AMPLITREX AT-1000 Tube Tester.

Fixed Bias Mode

GM Takes Precedence Over EM.
Tubes Test as Follows:

• GM [%]: 109/109
• EM [%]: 111/107
• No H-K Leakage
  

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.
  
• My career: Moved from Electro-Mechanical, Electrical Engineering to Biological Engineering.
• 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.