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  #1  
Old 05-25-2008, 11:11 AM
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larschr larschr is offline
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High voltage is too low - any ideas?

I have a 1962 Philips where the HV has dropped. The voltage is too low to make the filement of the HV rectifier glow, so i doesn´t get a picture. I tested it with a rectifying diode instead of the tube, and that gave a small (about 50-60% of the screen), blurry picture, so i know the rest of the set is working. I have replaced all the tubes and el. lytics on the Horizontal/Vertical and line output stages and carefully checked all soldering joints, but it doesn´t make any difference. When i turn it on i only get sound and the "whistling" sound from the horizontal output. The smoothening capacitors have dried out and lost most of their capacitance, but i guess it should give a picture anyway?
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Old 05-25-2008, 12:27 PM
tvman39
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You are going to want to replace all of the capacitors in the power supply as you probabaly have low B+ and that would cause you to have low hv,how does your output tube look in operation????if the plate is red or glowing DO NOT run it for any length of time as you will destroy the tube,this means you have lack of sufficent h-drive whick could be due to a weak power supply,bad oscillator tube or a bad capacitor in the horiz section and yes this will cause you to have low high voltage.
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Old 05-25-2008, 09:39 PM
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Old1625 Old1625 is offline
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I say the same as the last posting; you have some "homework" yet to do here before plugging in that set...And perhaps a bit more after that. Start with the first things first. Recap if it has not been recently done. Don't be fooled with the appearance of more modern-looking caps in a set of that age; it might not be as elderly as some sets discussed here, but it may actually be needing a third or even fourth set of caps at this point...sorry to say....
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