This listing is for a ONE(1) TUBE with Matched PLATES 

1953 WESTINGHOUSE (Sylvania-Hytron) 12BH7 TUBE (not 12BH7A)


Tubes Physical Characteristics:

-  Etched in glass "12BH7" "-------" "E3E" as date code of manufacture May 1953

(note that this etching style appears to be that of Sylvania-Hytron but tube is inked with "W" Westinghouse logo)

-  Long BLACK Centered PLATES

-  Large Horseshoe 'D' Getter  

- Heavy top-side Silver Flashing

- Thick copper & metal support rods. 

- Two thick spiked Mica Wafer-Spacers

- Two black thoriated heat Cathode vents atop plates and 2nd Mica spacer/wafer

- Yellow lettering "W" Westinghouse logo, vertical ink '312' '322' (312=EIA code for Sylvania-Hytron)
-  Tube ships in a Gold Black and White vintage Westinghouse box which is period correct but was inked for a 12BE6
tube which was scratched through then below handwritten below "12BH7".

You will receive a print out of this detailed description with test results in the box shipped.

TESTING:  TV7D/U Minimum Good  (60-65% Tube Life) is a meter reading of 30/30 = 1,500/1,500 uMhos Gm.

Average Industry NOS 'Bogey' Operating in CLASS A1 Amplifier when tested at 250VDC Plate Supply 

Voltage is a TV7 meter reading of reading 62/62 = 3,100 / 3,100 Gm at 11.5/11.5 mA plate current emissions. 

(See last pics for Tung-Sol/RCA Data Sheet dated 1950 & 1955 to verify these 'Bogey' #'s for Gm & mA)


Test Results: -


Calibrated (07/24/2023) TV7D/U TESTED at 150VDC Plate Supply Voltage

 NO Shorts, No Leakage, No Gas, No Apparent Micro-Phonics detected


TUBE IS WITH NICELY  Matched Plates with a 2.8% Gm match


Tube 1:  

   Side 1:  63.6 = 3,280 uMhos Transconductance (Gm)  at 14.9 mA (Ia =Anode Plate Current)

   Side 2:  61.8 = 3,190 uMhos Transconductance (Gm)  at 15.0 mA (Ia =Anode Plate Current)



Our test set: Dan Nelson restored, upgraded and calibrated (07/24/2023) TV7D/U with Digital Meter reading 

Transconductance in uMhos (Gm) and mA (Anode Plate Current).


WE PACK VERY WELL AND SHIP WORLDWIDE.

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