Avo 8 mk7 current transformer - UK Vintage Radio Repair and Restoration Discussion Forum

DavidG0MRF · 15th Oct 2020, 8:18 pm

Hi,

Can anyone please help identify the correct mounting points for the current transfomer in an AVO 8 mk7?
I have managed to repair the moving coil assembly but replacing the current transformer in the case is proving difficult, - I can't see if the transformer mounts on a PCB or on pillars or in the case! (Meter arrived disassembled and Megger only have a user manual no internal assembly diagrams)

Many thanks

David

Superscope · 19th Oct 2020, 1:08 pm

Hi David,

The Transformer mounts directly onto the Metal Frame behind
the Scaleplate. There are no standoffs, just screws.

The Transformer has a small PCB clipped to it where it's
connections are terminated. There is then a small wiring
harness connecting this small PCB to the Main Board.

I took some Photos which might help.

Ian

DavidG0MRF · 19th Oct 2020, 3:23 pm

Hi Ian

Thank you very much, those photos are very helpful. I should be able to get everything back into the case now. I just couldn't see 2 mounting points that had the right spacing between them. I do now....

Many thanks - Another AVO saved!

David

Superscope · 19th Oct 2020, 4:35 pm

Hi David,

Always good to save another Avo.

Especially a Mk VII, as they are not as common as the Mk V or VI.

There is no Service Manual for the Mk VII as far as I know, which
is a pain as the construction is quite different from the Mk V for
which there is a Service Manual.

If your Mk VII happens to have a surviving Serial Number,
maybe you could submit it on the Avo Multimeter Survey Sticky Thread.

Ian

15th Oct 2020, 8:18 pm	#1
DavidG0MRF Diode Join Date: Oct 2020 Location: Whitton, Middlesex, UK. Posts: 2	Avo 8 mk7 current transformer Hi, Can anyone please help identify the correct mounting points for the current transfomer in an AVO 8 mk7? I have managed to repair the moving coil assembly but replacing the current transformer in the case is proving difficult, - I can't see if the transformer mounts on a PCB or on pillars or in the case! (Meter arrived disassembled and Megger only have a user manual no internal assembly diagrams) Many thanks David

19th Oct 2020, 1:08 pm	#2
Superscope Octode Join Date: May 2017 Location: St Austell, Cornwall, UK. Posts: 1,018	Re: Avo 8 mk7 current transformer Hi David, The Transformer mounts directly onto the Metal Frame behind the Scaleplate. There are no standoffs, just screws. The Transformer has a small PCB clipped to it where it's connections are terminated. There is then a small wiring harness connecting this small PCB to the Main Board. I took some Photos which might help. Ian Attached Thumbnails

19th Oct 2020, 3:23 pm	#3
DavidG0MRF Diode Join Date: Oct 2020 Location: Whitton, Middlesex, UK. Posts: 2	Re: Avo 8 mk7 current transformer Hi Ian Thank you very much, those photos are very helpful. I should be able to get everything back into the case now. I just couldn't see 2 mounting points that had the right spacing between them. I do now.... Many thanks - Another AVO saved! David

19th Oct 2020, 4:35 pm	#4
Superscope Octode Join Date: May 2017 Location: St Austell, Cornwall, UK. Posts: 1,018	Re: Avo 8 mk7 current transformer Hi David, Always good to save another Avo. Especially a Mk VII, as they are not as common as the Mk V or VI. There is no Service Manual for the Mk VII as far as I know, which is a pain as the construction is quite different from the Mk V for which there is a Service Manual. If your Mk VII happens to have a surviving Serial Number, maybe you could submit it on the Avo Multimeter Survey Sticky Thread. Ian