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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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17th Feb 2014, 9:46 pm | #21 |
Rest in Peace
Join Date: Dec 2007
Location: Doncaster, South Yorkshire, UK.
Posts: 385
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Re: Radio City MultiTester Model 446.
Hi Cris.
That's OK. You can have it. As you say nice to look at if nothing ells. You win some, most of the time. hi. pete Can you close this thread.. |
17th Feb 2014, 11:49 pm | #22 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Re: Radio City MultiTester Model 446.
Thanks very much- I'm waiting with anticipation
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18th Feb 2014, 4:13 pm | #23 |
Rest in Peace
Join Date: Dec 2007
Location: Doncaster, South Yorkshire, UK.
Posts: 385
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Re: Radio City MultiTester Model 446.
Hi Chris
Thank you. I got the classic transistors in the post today. I've got a job for one or two. Hope you have fun with the meter. regards. Pete G4MRU |
18th Feb 2014, 11:31 pm | #24 |
Dekatron
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Location: Heckmondwike, West Yorkshire, UK.
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Re: Radio City MultiTester Model 446.
One post deleted, please use the PM system for personal correspondence.
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19th Feb 2014, 6:25 pm | #25 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Re: Radio City MultiTester Model 446.
And I've received the meter
I think this thread is dead, now...... If I sort out any more issues with it and get it to read correctly, I'll do a Success Story on it
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
20th Feb 2014, 7:16 pm | #26 |
Hexode
Join Date: Apr 2007
Location: Wiesbaden, Germany
Posts: 333
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Radio City MultiTester Model 446, 447
FYI,
here is an original schema for the Radio City MultiTester Model 447 VOM maybe similary to the 446 model. Peter. |
20th Feb 2014, 7:57 pm | #27 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Re: Radio City MultiTester Model 446, 447
Hi Peter.
Thanks for the posting. The 447 looks very much like what I finally arrived at for the 446, except that the Rx100 range switch position has moved and the universal shunt uses standard resistor values rather than the (closeish) set that I calculated. Also it uses only a single diode rather than the half bridge arrangement of the 446. While I'm at it, I've had a further look at my 446- as Pete said at some point the meter sensitivity is down-~1.2mA, probably lost magnetism. There are also some open elements in the shunt. Paradoxically the combination of these two faults means that the voltage ranges are about right The worst problem, though,is the state of the input sockets which are quite badly corroded in some cases. They're neither wander size nor 4mm, given its US origin I think they may be 1/16" or 3/32". In any case, to do anything with them would be more difficult than a mass replacement.
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |