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HOW TO TST RTC1 ?

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Forum » Valves / tubes - Semiconductors » VALVES/TUBES / SEMICONDUCTORS in RADIOMUSEUM » HOW TO TST RTC1 ?
           
Matthieu Testa
 
 
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22.Apr.20 14:02

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Hi, anyone able to tell me how to test RTC1 tube ?

Regards

 

Emilio Ciardiello
Emilio Ciardiello
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22.Apr.20 15:57

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A simple continuity check can be done measuring the cold resistance between pins 2 and 3 - the two smaller pins - which could measure somewhere around 200 to 500 ohms. A more accurate test could be made applying 50 V rms between the same pins and measuring the current which should be around 300 mA AC. The test could aldo be done in DC.

Emilio

Patrice Zeissloff
Patrice Zeissloff
 
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23.Apr.20 00:26

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Hello,

I have check my used RTC1 as in the circuit diagram of the Lemouzy TC54 radio

"Resistor" A  approx. 30 ohms cold is for approx. 110 V network with 5 tubes, eg 3 x 6.3V + 2 x 25V heating and 0,3 A heating current

V secteurI (A)V filamentV (RTC1)
800,2150            30  
900,2355            35  
1000,2560            40  
1100,2765            45  
1200,2970            50  
1300,3174            56  

"Resistor" B  approx. 19 ohms cold,

For 220V network the two resitor A + Bare serial switched with  5 tubes, eg 3 x 6.3V + 2 x 25V heating.

V secteurI (A)V filamentV (RTC1)
1000,1843            57  
1100,1947            63  
1200,2150            70  
1300,2253            77  
1400,2355            85  
1500,2558            92  
1800,2860         120  
2000,378         122  
2200,3276         144  
2400,3480         160  

Note : In the Lemouzy TC54 a 70 ohms are used with "Resistor" A for 130 V Network and or with A + B for 240V network.

Kind regards

 

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