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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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Old 12th Dec 2018, 11:05 am   #21
Superscope
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Default Re: Avo 36 range restoration

Regarding the Plastic Knobs on the 36 Range,

I think I am quite confident now in saying Yes there are indeed two versions of the 36 Range.

The Z control, (Movement Zero adjust) I believe this was always a Slot Screw Head
on all versions.
The earlier Meters up to around 1934 all the Controls are Slot Screw Head.

Later Models from around 1936 have Plastic Knobs on the R and P controls.

This is based on looking at my earlier 36, where I can see no evidence a Plastic
Knob was ever fitted, and I can't see how it would even be possible based on the
way the Screw Head is recessed into the Panel.
Also, why would it have a Screwdriver Slot if it were covered in Plastic?

I also looked up some AVO Advertising in a 1930's copy of Wireless World, and the 36 Range clearly has no Plastic Knobs in the Picture.

This would explain why the Model 6 seems to always have them, and early Models 5's downwards don't.

Unless of course, somebody knows something to the contrary.


Ian
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Old 12th Dec 2018, 12:06 pm   #22
Aitor Eneko
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Default Re: Avo 36 range restoration

I am agree with you. Two versions of Avo 36 range
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Old 14th Dec 2018, 1:50 pm   #23
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Default Re: Avo 36 range restoration

Finally got the Case off the 36.
Serial number found in Pencil on the back of the Scaleplate! Wicked!

Difficult to read, but in the right Light it turns out to be 5749.
Based on that, it's a 1936 Model and I estimate October-ish.

Bottom Resistance Board, disconnected and has broken Winding's.
Looks like the Board was removed and half halfheartedly put back, no doubt because
whoever couldn't fix it. The Board Mounting Spacers are also missing.

Small Resistance Board, one Winding is clearly Broken.
Resistance Board next to the Meter movement has one Toasted Winding, but might be Ok.

Will test the Meter Movement fully before moving on, but for the moment, I think it
should be possible to get this one back from the Dead.

I noticed the Fuse has been replaced with Fuse Wire (Hence 0 Ohms), and I wonder
how many of these Meters have been Scraped because the repairer didn't know the
Fuse needed to be 4 Ohms.


The other interesting thing I noticed, is that the Horseshoe Magnet is Front/Back, not
Up/Down as on my other 36 Range.

There doesn't seem to be a Schematic available for the 36 Range, so will have to try and
make one myself.

Ian
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Old 14th Dec 2018, 2:52 pm   #24
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Default Re: Avo 36 range restoration

Good notices. It will be a hard job, but possible.

Thanks for the information and photos!
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Old 14th Dec 2018, 7:09 pm   #25
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Default Re: Avo 36 range restoration

Superscope,

This may help.

Redrawn from the ACWEECO circuit diagram (which is terrible) by me.

May be used non-commercially by forum members, but please acknowledge the source.

Please report any errors detected.

PMM
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Old 14th Dec 2018, 8:39 pm   #26
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Default Re: Avo 36 range restoration

Many thanks for the Schematic PMM,

That is very helpful indeed.
Very nicely drawn as well.


Ian
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