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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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Thread Tools |
25th Mar 2017, 9:53 pm
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#1 |
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Octode
Join Date: Jan 2012
Location: Wimbledon, London, UK.
Posts: 1,465
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AVO Universal Measuring Bridge - Type 1
Hi,
Does anyone have any knowledge of these instruments? It's the one that is rather like a suitcase with a removable lid covering the front. Are they reliable, are there any common faults and what might need replacing, if anything? TIA, Colin. |
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25th Mar 2017, 10:03 pm
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#2 |
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Heptode
Join Date: Jun 2010
Location: Zurich, Switzerland
Posts: 538
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Re: AVO Universal Measuring Bridge - Type 1
Hello Colin,
is here your AVO Bridge Type1? _or do you have in older version? Than on Vintage-radio too... Regards Karl Last edited by karesz*; 25th Mar 2017 at 10:10 pm. |
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25th Mar 2017, 10:58 pm
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#3 |
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Octode
Join Date: Jan 2012
Location: Wimbledon, London, UK.
Posts: 1,465
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Re: AVO Universal Measuring Bridge - Type 1
Yes, Karl. That is the very one.
 Colin. |
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26th Mar 2017, 7:27 am
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#4 |
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Hexode
Join Date: Apr 2003
Location: Cotswolds, UK.
Posts: 465
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Re: AVO Universal Measuring Bridge - Type 1
I have one that I restored some time ago. If I recall correctly, I had to replace some capacitors, otherwise it works fairly well.
Robin |
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26th Mar 2017, 1:08 pm
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#6 |
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Octode
Join Date: Jan 2012
Location: Wimbledon, London, UK.
Posts: 1,465
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Re: AVO Universal Measuring Bridge - Type 1
Hi Karl,
Yes, I did look at that. I couldn't fine a manual or a circuit diagram anywhere else. I think I will have to PM Colin Armstrong to get a copy of his scan. Were the capacitors you replaced non-critical or were they the ones used as standards? I would hope that they weren't the standards; I imagine they could be pure "unobtainium". Colin. |
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26th Mar 2017, 1:45 pm
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#7 |
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Octode
Join Date: Jul 2004
Location: Dundee, UK.
Posts: 1,813
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Re: AVO Universal Measuring Bridge - Type 1
If no-one has a scanned manual, I have one and could scan it.
PMM |
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26th Mar 2017, 8:21 pm
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#8 |
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Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,194
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Re: AVO Universal Measuring Bridge - Type 1
Hi Colin, they are a very useful bridge and easy to use. A little cleaning, lub of the slide wire is sometimes needed, but be gentle.
Ed |
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27th Mar 2017, 12:44 am
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#9 |
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Heptode
Join Date: Jun 2010
Location: Zurich, Switzerland
Posts: 538
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Re: AVO Universal Measuring Bridge - Type 1
Hi PMM,
Colin in link of#5 has a complette scanned manual and circuit as high res too. Karl |
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27th Mar 2017, 10:27 am
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#10 |
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Octode
Join Date: Oct 2007
Location: Exeter, Devon, UK.
Posts: 1,554
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Re: AVO Universal Measuring Bridge - Type 1
Avo Universal Measuring Bridge Type 1. Suitcase style.
The complete manual is just too large to post on this Forum. I attach an extract which gives the key information. If you want the full manual, it will have to be sent by email. Faults. Nothing out of the ordinary, but be careful of the main potentiometer, a 12" long horizontal tube wound with resistance wire, forming a slide wire. I had to rewind mine as it had worn and fractured in the centre of the track. I have a spare bobbin of suitable resistance wire if you have to rewind. wme_bill m0wpn |
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27th Mar 2017, 6:03 pm
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#11 | |
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Hexode
Join Date: Apr 2003
Location: Cotswolds, UK.
Posts: 465
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Re: AVO Universal Measuring Bridge - Type 1
Quote:
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