thebes Posted November 1, 2017 Share Posted November 1, 2017 I've just started re-doing a Sencore MU150 tube tester. Couldn't find a cap in 150uf/250v value so I ordered up two 80 uf/250v's when combined gets me close enough. However, since this is my first soldering in awhile it seems I've forgotten some of the basics. So to get what I need I go negative to positive to negative to positive? That's go to be it. Right? Also while I'm at it, the circuit board has two resistors with what looks to be a small light bulb of some sort wired in series underneath the circuit board. Does this act as some sort of fuse for the unit. It is certainly not being used to provide background, or any other kind of lighting, for that matter. Also can I use a aa battery to test it? Quote Link to comment Share on other sites More sharing options...
thebes Posted November 2, 2017 Author Share Posted November 2, 2017 Now see, I knew there was a reason for asking that question, cause it's contrary to what you do with resistors, which is simply string them together. Glad I asked. Quote Link to comment Share on other sites More sharing options...
tube fanatic Posted November 2, 2017 Share Posted November 2, 2017 14 hours ago, thebes said: Also while I'm at it, the circuit board has two resistors with what looks to be a small light bulb of some sort wired in series underneath the circuit board. Does this act as some sort of fuse for the unit. It is certainly not being used to provide background, or any other kind of lighting, for that matter. Also can I use a aa battery to test it? It's probably a neon bulb used for additional regulation in the meter circuit. It cannot be tested with a battery. Maynard Quote Link to comment Share on other sites More sharing options...
thebes Posted November 2, 2017 Author Share Posted November 2, 2017 Thanks Maynard. I'll see if it lights up when I'm done with the soldering cap/resistor replacement job. Quote Link to comment Share on other sites More sharing options...
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