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Old 15th Aug 2022, 6:58 pm   #3001
Superscope
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Default Re: AVO Multimeter survey

Dave,

We need your Forensic Analysis of the Photo on page 72, post # 1427 third attachment.






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Old 15th Aug 2022, 10:15 pm   #3002
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Default Re: AVO Multimeter survey

Ouch my eyes! The May '38 meter certainly LOOKS like it has the old switching..my June '39 meter has the new switching.

I had a theory that a shadow factory was involved around this period, so to confuse the matter there could POTENTIALLY have been a brief crossover where both systems were being issued... updated tooling may have filtered to the satellite factory after a delay.
(Pie in the sky, but feasible..)

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Old 16th Aug 2022, 12:09 pm   #3003
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Default Re: AVO Multimeter survey

This is a part of the photo on page 72, post # 1427 third attachment, with the balcks lifted.

It's possible to see the switch leaves on the right hand switch (parallel to the front panel, and the centre screw of the right hand switch cam, so it appears to be the newer switch style.

PMM
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Old 16th Aug 2022, 12:24 pm   #3004
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Default Re: AVO Multimeter survey

Peter,

Yes, I think you may be right. Don't know what others think?

I guess that would put the change then, anywhere between late 1936 and
Mid 1938 then?

We will just have to wait for more pre War Meters to turn up.
At least ones where we can question the owners.

One thing I didn't notice before seeing your enhanced Photo, is the Ohms Board!
It's already moved to the position we are all familiar with between the Resistance Boards.

Obviously a lot of adjustments going on in the early Days behind the scenes
in the design department.


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Old 16th Aug 2022, 12:36 pm   #3005
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Default Re: AVO Multimeter survey

I think the clincher, is the orientation of the Leaf Switches.




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Old 17th Aug 2022, 11:22 am   #3006
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Default Re: AVO Multimeter survey

I have just been made aware of an old Heavy Duty Avometer.

Turns out, for the second time in as many weeks, this is the oldest
of a particular type in the Survey.

155-448

What surprised me however, when looking at the Photos, is that it
doesn't have "Proterty of GWR" on the Scaleplate, which is what I
was expecting.

This one has "BR (W)" instead. So British Rail, Western Region.

Looking at our 1948 records, the previous oldest was posted on Page 38
Post # 754 of this Thread. Serial 159-448
It is exactly the same, with "BR (W)" and it's the same Colour.

Seems the very early ones might have been Silver/Grey Hammered finish,
unless this was a special small batch.


The really interesting thing here, is the Mention of British Rail which of course
had only just been created, and then a brief period where GWR was mentioned.

It looks like there might have been some Political infighting going on in trying
to keep their Identity.




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Old 17th Aug 2022, 11:51 am   #3007
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Default Re: AVO Multimeter survey

Quote:
Originally Posted by Superscope View Post

Your Model D is interesting being built on a Model 7 Front Panel.
Not seen this before.
I've got a Type D here, built on a Model 7 front panel. I confess to having given up trying to get it working, as I could never reconcile the range resistances with the 1mA movement sensitivity.

If anyone would like to take it on, it's free for the cost of postage...!
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Old 17th Aug 2022, 12:34 pm   #3008
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Default Re: AVO Multimeter survey

Ian may want it Phil, but if not i could have a bash at it and return it to you if repair successful!

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Old 17th Aug 2022, 1:03 pm   #3009
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Default Re: AVO Multimeter survey

Quote:
Originally Posted by The Philpott View Post
Ian may want it Phil, but if not I could have a bash at it…
Hi Dave. I received a PM from Ian, who said virtually the same thing but with the names reversed!

I shall be delighted to post the meter to either of you, but please agree between yourselves who wants it… I don’t think it’s a basket case, but it needs work. As far as I recall, it was given to me by Paul Adams and I’ve no idea of its past history. The movement is 1mA FSD and it has the Type D scale. I have undertaken some work on it, but too far back to recall what I did. It’s probably the only Avo restoration that I didn’t complete successfully, so I hope one of you will be able to conclude the matter.

Here are some pics taken today. The bit of red tape is holding the Q knob in place; I don’t think the Type D had a Q knob, just a fixed button?

Ian, thanks for your PM to which I’ll respond in more detail in due course.

Phil
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Old 17th Aug 2022, 1:09 pm   #3010
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Default Re: AVO Multimeter survey

Yep, Model D had no Q knob function- didn't stop people trying to turn it, with predictable results!

I think Ian should have a go at it Phil, and he'll certainly let us know how he gets on.

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Old 17th Aug 2022, 1:12 pm   #3011
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Default Re: AVO Multimeter survey

Yes, okay Dave, many thanks. I’m just about to write back to Ian and I’ll arrange to get it sent off to him.

Cheers!
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Old 17th Aug 2022, 1:50 pm   #3012
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Ian, you have a PM.
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Old 17th Aug 2022, 9:24 pm   #3013
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Hi Phil,

Ok, I will happily take on the Challenge of getting this Hybrid into some resemblance of working order.

Actually, a Type D with Model 7 enhancements, might make an interesting Avometer. A type D with a working Q Control maybe?

Or a Model 7 with Type D ranges, might be more accurate.

Thanks Dave, challenged accepted, but I might be asking for your input.

I will have a think of the best way forward and start a new Thread on it in due course.


Phil,

I did start replying to your PM, when my Laptop decided to crash on me mid reply.
I think the Power lead was loose.
Will re-reply shortly.


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Old 23rd Aug 2022, 6:17 am   #3014
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Default Re: AVO Multimeter survey

My list of pristine working Avometers:

Avometer 9SX Test Set Steel Clad. Serial No. 817-15-361 Part 13574-5 Type 5QP/17447 (this version does not have the fuses in the battery compartment)
Avometer 8 MKIII. Serial No. 24789.965
Avometer Heavy Duty. Serial No.5892-1069
Avometer 8 MKII. Serial No. 97588-C1059
Avometer 8 MKI. Serial No. 41354-C-1255
Avometer 7 MKII. 83298-A-160
Avometer 8 MKII. Serial No. 56847.467
Avometer Model 40 Part No. 3284-149 (No Serial Number on Dial)

I have quite a few Avometers as shown in in photo plus a few of the storage cases. Its amazing that these are quite accurate to <1% and are usable. I keep them as museum pieces (batteries removed!) but I occasionally take one out of storage and check it. I have owned the 8 MK5 and MK6 but sold them since they do not have the same appeal as the older models. Although there is a fair bit of technical information on the internet I cannot find much about the Avo factories and the people who worked there. It would be great to find out more.
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Old 23rd Aug 2022, 11:24 am   #3015
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Default Re: AVO Multimeter survey

A DC AVOMINOR 5819-123 (December 1933) 89years old and almost in mint condition and the only thing wrong was dirt in mvt gap and the bearings needed adjusting, remarkable.

Mike
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Old 23rd Aug 2022, 10:21 pm   #3016
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Default Re: AVO Multimeter survey

Thankyou pthomas for the serial numbers (something tells me you are into photography also!) i agree about later avometers- i have nothing more recent than a Model 8 MkIII, anything later from the company doesn't appeal.

Micheal, i also have a very early DC Avominor from 1933, i'll reiterate the s/no tomorrow for info. It functions (well the pointer moves) but the mvt is gritty- probably debris or damage.

Dave
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Old 27th Aug 2022, 6:24 pm   #3017
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Default Re: AVO Multimeter survey

re. my post #2720 of 2/11/20, I've just spotted what's probably the s/n of the Multiminor Mk5: 009701.

Graham
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Old 28th Aug 2022, 4:59 pm   #3018
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Default Re: AVO Multimeter survey

As part of trying to update the information on Heavy Duty Avometers of
which currently there is very little, I have attached a few more Photos
of what I assume to be the Mk 1 that I posted about previously.

Note the lack of a Dataplate on the back.

A photo of what I assume is a Mk 2 has recently appeared on a different
Thread (Post # 13 ):

https://www.vintage-radio.net/forum/...d.php?t=193847


Does anybody on the Forum know the main differences between all the Marks?
And when they were released?
There were at least 6 Mk's.

From what I gather, the Mk 1 came out in 1948.
The Mk 2, looks like it was in production by around 1952.

The only confirmed Mk 6 had a 1984 Date.

I have no other information on the Heavy Duty, and most of the Survey
records don't have the Mk recorded either.

Service Data is sketchy, although a Schematic for the Mk 5 is in the back
of the Mk 5 user Manual which are fairly common.

I have an undated Schematic found on line which has some Value changes,
but no indication of which Mk it belongs too, so there were clearly changes
going on.

Does anybody have a known Mk 3, or 4?
How can you tell?




Ian
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Old 28th Aug 2022, 5:04 pm   #3019
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Ref Post # 3020

Thanks for the Number Graham, although it doesn't seem
to fit into the number sequence we have.

Doesn't necessarily mean it's wrong though.

Where was the number located?
Normally, it's written in the lower Middle of the Scaleplate
and would normally have a Date Code as well.



Ian
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Old 28th Aug 2022, 5:26 pm   #3020
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Quote:
Originally Posted by Superscope View Post
...
There were at least 6 Mk's.

From what I gather, the Mk 1 came out in 1948.
The Mk 2, looks like it was in production by around 1952.

The only confirmed Mk 6 had a 1984 Date.
I didn't realise the were six versions of the HD Ian. I always thought there were just five, of which the HD 5 seems to be the most prolific - by far.

My HD 5, Serial No. 14714, has 28.3.79 on it's Certificate of Test signed by H.J. Poole. I think I've added this info to the survey some time ago.

I'd certainly be interested to see a photo of a Mk6.

Jerry
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