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Old 9th Sep 2023, 2:48 am   #3241
millwright2309
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Default Re: AVO Multimeter survey

My model 7 and a Hoyt AC/DC volt meter.
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Old 9th Sep 2023, 2:51 am   #3242
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Default Re: AVO Multimeter survey

The batteries that were in my model 7, bought in August this year 40632-A-353, AC/DC seems to be working well.
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Old 9th Sep 2023, 8:47 am   #3243
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Default Re: AVO Multimeter survey

Wow! I believe that sulphur fumes from the rotting rubber test leads can blacken the switch contacts inside the avo, so best kept separate! Does the AVO 7 have a serial number at the bottom of the scaleplate?

Dave
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Old 9th Sep 2023, 4:10 pm   #3244
millwright2309
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Default Re: AVO Multimeter survey

40632-a-353
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Old 9th Sep 2023, 7:21 pm   #3245
bobbob!
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Default Re: AVO Multimeter survey

AVO Multiminor Mk. 5 : 014205
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Old 14th Sep 2023, 6:33 pm   #3246
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Default Re: AVO Multimeter survey

Avo EM272, part number 5170-425, serial number 175771.

Sadly this faulty unit has been steampunked (sensitively I hope) into a Zener diode tester, as described in a post under the Homebrew Equipment section of the Forum!

Cheers
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Old 19th Sep 2023, 2:43 pm   #3247
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Default Re: AVO Multimeter survey

Just taken possession of:

AVO Model 8, Mk II.

Serial No: 114874-C-1160.

Thanks for letting me have it, Glyn.
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Old 21st Oct 2023, 3:45 pm   #3248
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Default Re: AVO Multimeter survey

Likewise just taken posession of an AVO 8 Mk II, thanks to member Anthony. Search the thread but didn't find it mentioned, so here it is:

Serial number: 821940-C-1158.

The movement seems perfectly fine, but the case is damaged and will require repair, but otherwise looks quite clean.
The battery cover is made of Bakelite rather than the usual black metal plate.

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Old 22nd Oct 2023, 12:47 pm   #3249
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Default Re: AVO Multimeter survey

-Shortly after this there was a general change from bakelite battery covers to metal ones.
Sometimes it seems like a good idea to use a later cover on an earlier meter- until you find the holes don't quite line up. The difference is so small that i think it was accidental; possibly a slight shift in the setup of the jig.

Dave
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Old 22nd Oct 2023, 10:54 pm   #3250
AndyGilham
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Default Re: AVO Multimeter survey

Hi all, it's been a long time since I've logged in......work and life has taken priority....even over Avometers.
The Avometer collection in Dover continues to grow........all currently stored in a room full to the brim of everything Avo or Evershed.
I recently received a call from a lady who's father was a field sales rep for Avo from 1958 to 1981. Sadly he passed, but had a large collection of meters and documentation. She kindly donated a number of his meters to Megger, so I visited her to pick up 15 meters and approx. 8 boxes full of documents, notes, guides, service manuals.....I still need to sort it all

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Old 24th Oct 2023, 6:39 pm   #3251
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Default Re: AVO Multimeter survey

Welcome back
Good to hear that collection is expanding.
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Old 27th Oct 2023, 7:49 am   #3252
AndyGilham
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Thank you Richard. I hope you are well.

I am still very annoyed that I was unable to received your collection, it would have really added something special. Unfortunetely it was the wrong time and wrong personal involved to be able to come and collect them. A loss for me and for Megger.

Andy
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Old 28th Oct 2023, 8:17 pm   #3253
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Default Re: AVO Multimeter survey

Hi Andy, nice to hear from you. My Protimeter and Type H Universal Avominor have yet to be attended to, the Type H has a problem with the moving coil carrier binding against the cylindrical 'former' when towards the top end of the scale. Unlikely to be fixable, but we'll see.

Dave
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Old 29th Oct 2023, 12:09 pm   #3254
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Default Re: AVO Multimeter survey

Dave, you mention the “Type H Universal Avominor”. I have previously commented on the existence of at least four different models of that instrument, in my small collection anyway, but I didn’t know there were official designations. Can you point me towards the relevant information, please?

Many thanks,
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Old 29th Oct 2023, 1:38 pm   #3255
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Default Re: AVO Multimeter survey

Phil, quite apart from the Model 1 meters that went to the military with 'ZD' or 10S/46 references incised and white infilled, (which you've no doubt seen) the Type H Model 1 variant has a special instruction plate denoting it as a Type H.

Richard Allen notes detail differences in the switch assy, but it's basically a Model 1.
(ref- 'Richards Radios')

I'd like to have a closer look at mine but the weather's just turned and it's in the workshop..i know it has the earlier type facia design with finger guards around the terminals.

So...we know we have Type E and Type H variants..perhaps the others never even existed in principle, or just never got off the drawing board.

Dave
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Old 29th Oct 2023, 1:58 pm   #3256
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Default Re: AVO Multimeter survey

Thanks, Dave. I will run through mine later and check what I’ve got. I vaguely recall that there was a high resistance version of the Minor, and I think I might have one.

Universal Avominors are conveniently small enough to keep in one’s toolbox! I used one in this way for several years till a MultiMinor came along.
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Old 29th Oct 2023, 5:29 pm   #3257
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Yes, there is the Model 2 which is 4000 ohm/volt compared to Model 1 400 o/v. Also a Model 1A with a low resistance scale- but electrically identical to a Model 1!
The movement of the Model 2 is noticeably better damped, and i believe that this makes it ever so slightly less accurate than a Model 1; the drag isn't conducive to the pointer always settling at exactly the right spot. (Nit picking really; they're close enough)

If we're talking DC Avominor, there's a 20kohm/volt example which had a limited production run. Curiously the pointer on these is NOT heavily damped; around 4 swings to settle.

Dave
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Old 4th Dec 2023, 2:47 pm   #3258
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Default Re: AVO Multimeter survey

Another DC Avominor Type HR has come out of the woodwork, s/n 338-39.
(Meter 338 from March 1939) The gold leaf legend on the box is in very good condition judging by the photos.

This makes 11 known extant examples, the earliest August 1938, the latest January 1941.

When less were known they fetched more money from the enlightened, but i'm rather happy that we're getting more examples coming up, and also people are willing to disclose serial numbers. With 338-39 i advised the seller how to damp the movement, so it should have arrived at it's new home with no further deterioration. Where that home is; i have no idea.

Dave
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Old 4th Dec 2023, 10:49 pm   #3259
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Default Re: AVO Multimeter survey

I have two, AVO 8 mk3, both bought on Ebay a few years back from U.K. sellers. The younger one arrived with a defective meter movement so I bought another and with much better luck that time. The serial numbers are 5591.1164 and 72598. 168.
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Old 31st Dec 2023, 4:06 pm   #3260
AndyGilham
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Default Re: AVO Multimeter survey

Good morning all on this last day of 2023.

Today I took delivery of a Protimeter Moisture Meter (serial 137-856 [August 1956]). I know these have been discussed on the forum, as they utilise the Universal Avominor enclosure; although not an Avometer, there is interest there.
A nice addition to the collection.

I hope you all have a great new year and prosperous 2024.
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