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hammarl-mf: hq129 too much B+

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Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » hammarl-mf: hq129 too much B+
           
John Morris
 
 
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28.Jun.18 00:08

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my 129  is running too much b+ ....340 at pin 8 5u4 versus 300 ....this causes vr tube to overwork by 50%....60 ma vs 40max

....the radio is freshly recapped and appears to be working well... i am thinking of placing a suitable resistor between 5u4 pin 8 and the choke....any ideas???...john

John Morris
 
 
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28.Jun.18 19:46

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nevermind...it wasa line voltage thing....123 line volts caused problem...radio now running on 114 from variac...302 volts at pin 8

  
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