SHINING LIGHT is Offering The Following Tube:
One Excellent AMPEREX EF91 6AM6 Tube 
Lot#: EF91-1,2,3,4
  • NOS NIB
  • AMPEREX Lettering & Box, MULLARD MITCHEM Mfg.
  • Beautiful Tube
  • Tube Box in Excellent Condition
Value-Added Tube
  • Tube Surface Cleaned
  • "Plug & Play"
This Sale is for One Tube.
Four Tubes are Available for Purchase

Testing 
Hickok TV-7A/U*
Tube Tested on Freshly Calibrated Hickok TV-7A/U Mutual Conductance Tester.  
Tube Tests  as Follows.
Tube Reading: 
#1: 35
#2: 37
#3: 38
#4: 39
Tubes Test: 92,97,100 and 103% of Calculated NOS
No Shorts.
TV-7 Minimum for EF91 Tubes: 25. 
The Minimum is Defined when the Tube has 65% of it's life left.
This TV-7 was just Refurbished and Calibrated by Nelson this May, 2021.  

Murphy's Law:
"All Tube Testers are Wrong but Some are Useful"
** The Results from Your Tester will probably Differ from my Results.

Condition
Please Review Pictures Before You Purchase.  I provide lots of close-up pictures. :-)
Flashing: Flashing is good.
Lettering: Tube has good lettering. > See Picture
Box: Amperex Box in good shape.
Date Codes: RBH3, RBH2, RBI3, RBI1

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.

Why buy from old Murph?
  • Integrity & Trust: Check my feedback.
  • I answer emails.
  • I ship fast. I pack well.
  • I combine shipping.  The shipping calculator should work for this listing.
  • I don't require immediate payment.  You can add items and I can invoice you with combined shipping.
  • I use the Ebay return policy of 30 days.
If you have any problems and old Murph will take care of you.  :-)
I want to ensure that you are happy with your purchase. Sometimes, Murph misses something.  Murph is getting old and can make mistakes on occasion!  Murph's goal is a 5-Star sale to you, my customer! If you feel that Murph has fallen short, feel free to contact Murph and we will get it straightened-out. :-)