SHINING LIGHT is Offering The Following Tubes:
AWESOME RCA 12SA7 12SK7 12SQ7 35Z5GT 50L6GT Radio Tubes
Lot#: M149
  • NOS NIB
  • Metal 12SA7, 12SK7 & 12SQ7 Tubes
  • Glass 35Z5GT & 50LGT Tubes
  • "Old-School" RCA AA5 Tubes
12SA7, 12SK7, 12SQ7, 35Z5GT and 50L6GT Tubes are NOS.
50L6 has a Very Small Deposit On Top of Tube from Multiple Tests.

BEST Place to Purchase Radio Tubes on EBAY.
"Select-Choice NOS Tubes"
Vetted on $3000 AMPLITREX Tester and/or Professionally Calibrated HICKOK TV-7.
All Weak Tubes are Discarded

One Each: 12SA7 12SK7 12SQ7 35Z5GT 50L6GT
Total of Five Tubes

Value-Added Tubes
Pins Cleaned with Proprietary Process.
Tube Surfaces Cleaned
"Plug & Play"

Testing
Tubes Tested on a AMPLITREX AT-100 Tester or a HICKOK TV-7 D/U Tube Tester.
Tubes Test as Follows:
12SA7: EM: 142%, GM: 103%  (AMPLITREX)
12SK7: EM: 102%, GM: 90% (AMPLITREX)
12SQ7: EM: 90%, GM: 109% , 941uA, 949uA: Balanced Diodes (AMPLITREX)
35Z5GT: 62, Minimum: 40 (HICKOK TV-7)
50L6GT: 84, Minimum: 45 (HICKOK TV-7)
No Unusual Shorts.

The Minimum is Defined in Hickok Tube Test Settings Documentation.
TV-7D/U has been Refurbished and Calibrated by Dan Nelson in May, 2021.
AMPLITREX AT-1000 was Purchased in December, 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 see detailed pictures to ensure you visually understand the condition of tube(s) before considering purchasing. :-)
Tubes: NOS NIB
Flashing: Flashing is good.  No Deposits. Flashing color varies by tube with possible discoloration due to mfg process at time of mfg.
Tube Lettering: Lettering is Good. See Pictures.
Boxes: RCA Boxes in Good Shape
Box & Writing: Boxes will have written documentation on surface.
Date Codes: KF,TAC,ACS,126,TAC

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: Just 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. :-)