B&K Tube Tester

denny9167 · 06:13 PM

I have a B&K 700 tester,I purchased awhile back,and was testing some tubes the other day in the Quick-check section,and noticed that when I press the test 1 button or the test 2,the meter Deflects in the opposite direction,the bottom switch section seems to work OK,does anyone know what might be the problem? I did notice one thing when I opened the unit,one of the #55 bulbs was out,would this have anything to do with the problem?

mctavish · 31st January 2011, 07:39 PM

Hello, I have a few similar units and I can tell you that those bulbs are ESSENTIAL to the unit functioning properly, they are part of a circuit that automatically adjusts the meter for line voltage fluctuations. Its a good idea to hard wire them in as the push-n-turn bulb holders can have intermittent contact after a while due to corrosion. Its also a really good I idea to replace all of the electrolytics ( especially the one across the meter terminals) for accurate readings. The rectifier tube can be replaced with SS diodes as well. HTH

Captn Dave · 31st January 2011, 08:08 PM

+1

That is your problem. I always solder the bulb in place. If you don't the unit will not hold calibration.

31st January 2011, 06:09 PM	#1
denny9167 diyAudio Member Join Date: Nov 2007	B&K Tube Tester I have a B&K 700 tester,I purchased awhile back,and was testing some tubes the other day in the Quick-check section,and noticed that when I press the test 1 button or the test 2,the meter Deflects in the opposite direction,the bottom switch section seems to work OK,does anyone know what might be the problem? I did notice one thing when I opened the unit,one of the #55 bulbs was out,would this have anything to do with the problem? Last edited by denny9167; 31st January 2011 at 06:13 PM.

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31st January 2011, 07:39 PM	#2
mctavish diyAudio Member Join Date: Feb 2008 Location: Niederösterreich	Hello, I have a few similar units and I can tell you that those bulbs are ESSENTIAL to the unit functioning properly, they are part of a circuit that automatically adjusts the meter for line voltage fluctuations. Its a good idea to hard wire them in as the push-n-turn bulb holders can have intermittent contact after a while due to corrosion. Its also a really good I idea to replace all of the electrolytics ( especially the one across the meter terminals) for accurate readings. The rectifier tube can be replaced with SS diodes as well. HTH

31st January 2011, 08:08 PM	#3
Captn Dave diyAudio Member Join Date: Jun 2008	+1 That is your problem. I always solder the bulb in place. If you don't the unit will not hold calibration.

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