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Tr_XXXX

Information - Help 
ID = 39375
       
 
   
Tube type:  Transistor 
Identical to Tr_XXXX

Filament Solid State /
Description

.
THIS IS NOT THE NAME OF A TRANSISTOR TYPE

Manufacturers of equipment sometimes used designations such as:
* Green Spot
* White Spot 1, White Spot 3
* Blue Spot - or "Yellow Circle" (followed by a number) etc.

Such designations enabled the manufacturer to source from different suppliers and also to test the devices before assembly and code - usually with a coloured dot or ring.
This also aided hand assembly by the operators and inspection to ensure that correct devices were fitted.

This practice was mostly carried out during the early days of germanium transistor use when the quality and consistency of performance was frequently dubious.

 
Text in other languages (may differ)


 
tr_xxxxred.gif
Tr_XXXX: KoBi
Konrad Birkner

 
to_22_sams~~36.png
Tr_XXXX: SAMS
Günther Stabe

 

Usage in Models 3= 1959 ; 1= 1960?? ; 2= 1960? ; 2= 1960 ; 2= 1961?
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):10

Tr_XXXX*Box
   

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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