SHINING LIGHT is Offering the Following Tube:
One AMPEREX 6GM8 ECC86 Tube
Lot#: E129
  • NOS NIB
  • BUGLE BOY Image Intact
  • VALVO Mfg.: D3H3
  • Fully Vetted Tube
  • Date Code: 6338
Value-Added Tube
  • Pins Straightened with Proprietary Process
  • Tube Surface Cleaned
  • "Plug & Play"
Testing  
Hickok TV-7A/U*
Tubes Tested on a Hickok TV-7A/U Mutual Conductance Tester.
The Tubes Test as Follows (Triode/Triode):
  • 47/48
TV-7 Minimum for 6GM8 Tubes: 32/32. 
The Minimum is Defined when the Tube has 65% of it's life left.
TV-7A/U was Rebuilt & Calibrated by Dan Nelson in May 2021.
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 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.