*FantasticTubes 🎷  🎶

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One matched pair, circa 1950s, USA made by Sylvania/Philco/Lansdale,
type 6189 / 12AU7WA vacuum tubes
as pictured.
<<<<< As pictured = What You See is What You Get. >>>>>

A little Note for you:
These tubes were manufactured by two very long time (decades) business partners - Philco and Sylvania in their tube manufacturing plant in Lansdale, PA.

Silk-Screening:
Please see photos

Acid Etched Batch#:
25C
45B

Acid Etched Designations:
6189 / 12AU7 / WA
6189 / 12AU7 / WA

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Tubes feature 17mm-long-metallic black-ribbed plates and top-mounted 'Horse-shoe' shape (please see last two photos) getters construction.

Tubes appear identical in construction!

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Hickok TV-7B/U* tested

Test Result(s)
Tube#1    101 / 99               
  Tube#2    99 / 101                

minimum (65% of NEW) recommended for a good tube
56 / 56

(Triode#1 / Triode#2)

*Hickok TV-7B/U is a mutual conductance(Gm) type tube tester. It does check for mutual conductance and the result displays in percentage quality instead.

Satisfaction Guaranteed!
*FantasticTubes !!!
🎷 🎶