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rca:  ; 97X ( 97 X)

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » rca:  ; 97X ( 97 X)
           
Gabriele Seccia
Gabriele Seccia
 
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15.Jul.09 23:49

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Salve ai soci, ho acquistato questo ricevitore ed ho notato che monta il BK428 un ballast. Domanda il ballast e' uno stabilizzatore di corrente ? viene solo montato su ricevitori con valvole aventi filamenti in serie ? Volendo questo lo posso sostituire col 6H6 (naturalmente non il doppio diodo, ma il 6H6 ballast) ? Se qualche associato puo risolvermi questi mie dubbi da novello restauratore ... ? distinti saluti a tutti

Gabriele.

Konrad Birkner † 12.08.2014
Konrad Birkner † 12.08.2014
 
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16.Jul.09 11:39

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There is no BK428, but a BK42B... 
It drops 42 Volts at 300 mA.

The 6H6_ballast is for 700 mA at 5.1 - 8.3 V. No way !
You would immediately kill Your other tubes by overheating (115 V for a 74 V circuit =
R.I.P.)

My recommendation:
Insert 125 ohms 12 Watt resistor between pin 3 and 8;
and a 15 ohms 2 Watt resistor between pin 7 and 8 (for the dial lamp).

Good luck,
KoBi

 

This article was edited 16.Jul.09 11:57 by Konrad Birkner † 12.08.2014 .

Gabriele Seccia
Gabriele Seccia
 
I  Articles: 109
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16.Jul.09 13:31

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97 X 

Ok KoBi , thank you very much , good morning .

Gabriele.

  
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