SYLVANIA JAN CHS 6SN7GT VT-231 *BOGEYS*

LEGENDARY '1943' TOUGH DOG

U.S. ARMY SIGNAL CORP

*WEAPONS GRADE*

HEAVY CHROMED FOIL

BOTTOM D GETTER

2 HOLE BLACK LADDER PLATES

RECTANGULAR MICA TOP

PERFECT MATCHING QUAD

Extremely Rare - NIB - MINT
(New in *Original Boxes)


★★★ 
Amazing Historic Military Tubes ★★★

U.S. ARMY  U.S. NAVY  JAN  Military Specification Tubes

Production Year: '1943'

Matched Codes:  SC966A K4 K4 K4 L4

Tall Black Base

Military Label

Quad Set of Four (4) Tubes

***The Tubes Pictured are the Tubes Offered***

Made In the U.S.A.

 These Tubes are Very Rare in Brand New Condition 

BEST TUBES ON THE MARKET...  NO LEAKS...  NO SHORTS...


★★★ HICKOK TESTED ★★★

Tested on Hickok 750 for Emission, Mutual Conductance

Where 50 mA is Good these tubes peg at 87/90 for Emission

Where 2,600 μA is Good these tubes peg at 3,400/3,600 for Mutual Conductance

Tube 1. Plate 1. 87 mA 3,400 μA  at Idle - NOS

             Plate 2. - 88 mA 3,500 μA  at Idle - NOS

Tube 2. Plate 1. - 90 mA 3,500 μA  at Idle - NOS

              Plate 2. - 90 mA 3,500 μA  at Idle - NOS

Tube 3. Plate 1. 88 mA 3,400 μA  at Idle - NOS

             Plate 2. - 87 mA 3,400 μA  at Idle - NOS

Tube 4. Plate 1. - 90 mA 3,600 μA  at Idle - NOS

              Plate 2. - 90 mA 3,500 μA  at Idle - NOS

Balanced - Rare and Exceptional - Full Tonal Range

EXCLUSIVE HIGH FIDELTY TUBE


All of my Tube Inventory is Boxed and Thoroughly Tested... *Test Ratings are Specific to My Fully Calibrated Test Equipment! ***Coding is for my internal method... Tubes are marked to match shop reference and No. I, II...

The tubes are put through a Life Test and each plate is warmed and measured for emission, leaks and shorts!  Each tube is thoroughly inspected, they are described accurately and listed based on fair value...   

My Return Policy: 30 Days - Seller pays return shipping!  All tubes are Guaranteed to be as described...  You can buy with complete confidence!  Please read listing thoroughly and ask any questions prior to purchase...  Tube rolling will not be tolerated!  Any and all returns must be in identical condition as when they were received...  Test Driving Vintage NOS Tubes is completely unacceptable and highly unethical!  Buyer will be charged for mishandled and damaged returns...  

All tubes manufactured emit some type of sound, hum or slight microphonic!  Noisy tubes would always be auctioned or tossed...  I mark every tube in order to avoid tube rolling!  Variations in Line Output and Test Equipment excludes any claims regarding matching test results on any equipment other than mine...  *Test results from different Test Equipment IS NOT Guaranteed!

International Buyers Welcome!  I use eBay Global and USPS 1st Class International exclusively, unless otherwise stated...  I am unable to change declared value on customs forms, and International Buyers are responsible for all taxes, customs and additional fees!  Each tube is fully insured, boxed and shipped safely...

  Expedited Shipping 

 Shipping times may vary based on region 

 *Honesty, *Reliability and *Integrity are *Everything