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Old 13th Jul 2022, 6:31 pm   #2961
Pamphonica
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Default Re: AVO Multimeter survey

Reporting a Heavy Duty Avometer (Mk5). 10344-475 (April 1975?). Acquired at RWB in the auction. VGC, in case with leads, working very well.
(Also entered on the Google Sheets database
https://docs.google.com/forms/d/e/1F...7YQKg/viewform)
-Jeremy
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Old 16th Jul 2022, 4:30 pm   #2962
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Default Re: AVO Multimeter survey

A little acquisition to add to the log

Model 8 Mk 6 - 1008 M91400 - Nato Multi Range Test Set MK4
Model 8 Mk 6 - 1296 M92054 - British Telecom
Model 8 Mk 6 - 1102 M91751 - Regular Set
Model 8 Mk 6 - 1196 M90218 - Regular Set
Model 8 Mk 6 - 1039M91400 - Nato Multi Range Test Set MK4
Model 8 Mk 6 - 1020 M926680 - Nato Multi Range Test Set MK4
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Old 25th Jul 2022, 5:46 pm   #2963
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Default Re: AVO Multimeter survey

I may have mistaken one of my Avo's for a Model 5, when in fact it may be a Model 4. Could anyone here with a Model 4 post a photo of the 'Instructions for Use' plate which has the ranges please?

Thanks.
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Old 25th Jul 2022, 6:05 pm   #2964
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Default Re: AVO Multimeter survey

Here are photos of mine.
The instruction plate photo is skew, since the plate is silvered and has bad reflections if photographed straight on!
The key is whether you have 3 or 4 AC volts ranges on the right-hand knob. The model 4 has 3 ranges, the model 5 has 4 ranges.
Contact me directly if you need more.
Jeremy
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Old 25th Jul 2022, 6:21 pm   #2965
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Default Re: AVO Multimeter survey

Thanks Jeremy, can't see the detail in the plate, but from what I gather, the Model 4 plate should say for Volts, 10 ranges DC and 6 AC? Where as the 5 is 10 DC and 8 AC which with the divide by 2 button correlates with what you said.

Now, the one I thought could be a Model 4, does have the four ranges on the switch, but the rear plate says 6 AC ranges? Odd? Maybe a mixed up front and rear?
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Last edited by Sinewave; 25th Jul 2022 at 6:28 pm.
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Old 25th Jul 2022, 6:28 pm   #2966
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Default Re: AVO Multimeter survey

If it has 4 AC ranges on the switch, it's the Model 5, but probably in a Model 4 case!
Mine 4 says on the plate "Volts 10 ranges DC 6 Ranges AC". (takes account of the divide by 2 button).
Let's take this offline via email or PM to avoid clogging this thread.
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Old 26th Jul 2022, 2:34 pm   #2967
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Default Re: AVO Multimeter survey

Some of the early Model 5's can be found with Model 4 Dataplates.

AWEECO were probably, simply using up surplus Model 4 Dataplates
due to the short Model 4 production run.


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Old 26th Jul 2022, 9:09 pm   #2968
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Default Re: AVO Multimeter survey

Agree with Ian, that's very likely.

Easiest identification feature is the presence of the 480 volt AC range on a Model 5.
Model 4 lacks this- a curious omission.

Dave
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Old 29th Jul 2022, 4:29 pm   #2969
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Default Re: AVO Multimeter survey

He's a new one for the Survey.

Only spotted this one this week.

An S Variant, but on a Model 48A instead of a 47A

Also, the S is definately engraved on the Model Ident,
instead of being Painted on above it.




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Old 29th Jul 2022, 5:03 pm   #2970
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Default Re: AVO Multimeter survey

And staying on the Subject of the Model 40's wider Family group,
to Date, the earliest Model 40 Serial Numbers we have are from 1940.

The Serial Numbers have always indicated that Model 40 production
started around August/September 1939.

This Week, I came across Two 1939 Serial Numbers relating to Model 40's.
1153-99 and
1264-109

The interesting thing here (if anybody actually finds any of this interesting!), is
the Numbers are both from a Model 48A.

Looking back through the Records, we actually did have one 1939 Serial Number
relating to a Model 40, and it was on a Model 47A.

So it's starting to look like, the Model 40 may have actually launched as the
47/48A and the real Model 40 may not have come out until 1940.

The Fact that we only have Three Serials from 1939 and they are all Admiralty
Pattern Meters would suggest very few if any True Model 40's were made in 1939.

It also confirms the 1930's Style Decade Date Coding extended to Model 40
production Variants as well.


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Old 31st Jul 2022, 12:39 pm   #2971
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Default Re: AVO Multimeter survey

It is interesting. At least for me!

Thanks
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Old 31st Jul 2022, 5:54 pm   #2972
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Default Re: AVO Multimeter survey

I understand that the Model 40 was announced prior to an intended introduction in 1939 but it's likely that by the later part of the year, there was a heavy demand to fulfill Government contracts.

This could have been related to a warship building programme in the case of the Admiralty and it could possibly be that all Model 40 components were diverted to meet 47A and 48A contracts.

Does anyone here know if there was in fact such a shipbuilding programme?

The 'S' variant on a 47A is also interesting. Is there any discernable difference which account for this?

PMM
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Old 31st Jul 2022, 9:07 pm   #2973
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Default Re: AVO Multimeter survey

I have a 47A(S) and it's effectively a Model 40 dressed as a 47A...moreover the instruction plate (which seems to be original) is a Model 40 item.

The high resistance range is enabled by 9 volts on-board, rather than having to use external voltage as per a 47A/48A.

Memory fades, but i'm sure I have seen a copy of an old document which details Model 40 spec meters being provided to the Admiralty to fulfil part of an order for 47A...these were the 47A(S) meters. Presumably there was a shortfall on the order...?

It's a slight frustration that Admiralty meters seem to survive quite well, but Model D air ministry issues clearly saw lots of further use after the war and are more worn out!

Dave
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Old 1st Aug 2022, 1:05 pm   #2974
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Default Re: AVO Multimeter survey

It was some time ago but I felt sure i had copy of this document as i found the original link i gave now has a 404 response but then i see you attached the pdf to your post 1411.
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Old 1st Aug 2022, 2:45 pm   #2975
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Default Re: AVO Multimeter survey

Thanks Richard.
(Page 71 on this thread, then page '67' on the pdf document!)
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Old 2nd Aug 2022, 6:35 am   #2976
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Default Re: AVO Multimeter survey

ive just aquired an AVO model 8 mk 111,payed 3 quid at a boot fair ,condition poor but savable i hope ,75106 268 is the number
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Old 2nd Aug 2022, 1:32 pm   #2977
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Default Re: AVO Multimeter survey

Quote:
Originally Posted by Viscount View Post
ive just aquired an AVO model 8 mk 111,payed 3 quid at a boot fair ,condition poor but savable i hope ,75106 268 is the number
The 8 only went up to mk 7
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Old 2nd Aug 2022, 7:47 pm   #2978
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Default Re: AVO Multimeter survey

Quote:
Originally Posted by Sinewave View Post
Quote:
Originally Posted by Viscount View Post
ive just aquired an AVO model 8 mk 111,payed 3 quid at a boot fair ,condition poor but savable i hope ,75106 268 is the number
The 8 only went up to mk 7
111 (as in 3)
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Old 2nd Aug 2022, 7:51 pm   #2979
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Default Re: AVO Multimeter survey

Quote:
Originally Posted by viscount View Post
Quote:
Originally Posted by sinewave View Post
Quote:
Originally Posted by viscount View Post
ive just aquired an avo model 8 mk 111,payed 3 quid at a boot fair ,condition poor but savable i hope ,75106 268 is the number
the 8 only went up to mk 7
111 (as in 3)
III
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Old 8th Aug 2022, 4:49 am   #2980
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Default Re: AVO Multimeter survey

Hi all.
I've just joined this excellent group and would like to add my contribution to the AVO saga.

I have an AVO 9SX (Multimeter Type 12889), Pan-climatic No.1 (High Sensitivity), serial no. 6718-15-1263.
Has the "crows foot" with 5QP/17447 on the dial.

As I'm new to this, any info on this wonderful beast would be appreciated.
Cheers,

John
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