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BA4721

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ID = 33353
       
 
   
Tube type:  German Military Stamp only 
Identical to BA4721

Filament
Description BA 4721 is not the designation of these tubes.
They were manufactured or selected for the former "Luftwaffe" (German Air Force). BA stands for Betriebsabnahme" or "Accepted work for the Air Force". The number is the reference to an examiner in person. The examiner inspected usually a large number of different tubes.
More information about these examination stamps is given in this link. If we know more about this particular examination number you will find a forum article below.

We try to show here all different tubes with this paricular BA-number. Each picture legend should give information about the actual tube type plus all other markings on that particular tube. We would like to show only one picture for each tube designation if all other markings are the same (incl. Date).
 
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BA4721: Gross klicken - click to big size
Anonymous 15 Collector

 

Collection of a member from D

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
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