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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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21st Mar 2020, 1:24 am | #1 |
Octode
Join Date: Jun 2013
Location: Huddersfield, West Yorkshire, UK.
Posts: 1,795
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Marconi TF2603 RF Millivolt meter
Hi peeps.
I had one of these "beasties" in my cupboard for a while..and typically.. when I wanted to use it..it was not working..It was when it was put away. As I had other means of measuring RF, I put it to one side till early this week. The symptoms were... No Zero pot function.. All ranges reading low.... but not by the same percentage... I chased my tail for a few hours, trying this and that, even the diodes in the probe..."not that"....Then I looked at the electrolytics on the main amp..One was O/c and others had a higher ESR than "00"... so all were replaced. Still faulty. I looked on the forum and this fault had been noted before,, the result was the main range switch needed cleaning..so I cleaned the contacts and dried the wafers... still faulty. As it is over 50 years old and I have other means of RF measurement I decided that my time is more precious than this lump, so it has been recycled...I suspect the range switch had more problems than I could see, thus it is BER. I know the purists will throw their hands up in horror, sorry and all that.
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Should get out more. Regards Wendy G8BZY |