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Old 1st Feb 2020, 9:57 pm   #2441
The Philpott
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Default Re: AVO Multimeter survey

..No problemo, my memory does this Peter, but usually regarding what i had for dinner an hour ago- then a minute later the fog clears!

The functionality to weight ratio of the Avo HR is quite poor- no AC current ranges and DC current only up to 1 amp. The terminals are rather spindly as well, prone to getting bent when extended. After some tweaking I actually got mine within specs as described on the rear of the meter.

Dave
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Old 15th Feb 2020, 9:44 am   #2442
AndyGilham
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Default Re: AVO Multimeter survey

Picked up a 1983 Avometer Model BM10. Quite a bit different from the original Model 10, becoming a BM10 when The company became Megger.
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Old 15th Feb 2020, 12:10 pm   #2443
micheal
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Default Re: AVO Multimeter survey

The AVO model 10 is a multi meter.
The AVO/MEGGER BM10 is a insulation tester.

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Old 15th Feb 2020, 1:05 pm   #2444
AndyGilham
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You think I should know that..... good point! ����
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Old 15th Feb 2020, 6:41 pm   #2445
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Default Re: AVO Multimeter survey

The casing style was the same for several instruments including the DA116 & DA117, with different colours of plastic used for the mouldings. The Model 10 looks at first glance to have been used in heavily nicotine poluted atmosphere, even when new.

If anyone wants a scan of the Model 10 user manual, please let me know.

I don't know if the Model 10 was an export-only model but it doesn't seem to have been widely advertised in the UK.

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Old 17th Feb 2020, 12:42 am   #2446
AndyGilham
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Default Re: AVO Multimeter survey

Peter,
I do have a couple of Model 10 in the collection.....But you don't see many! I also have a couple of user manuals in different formats.
It's a nice little instrument.

Andy
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Old 21st Feb 2020, 10:00 pm   #2447
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Default Re: AVO Multimeter survey

I found the elusive Long Reach Probe recently, which fitted in the
Battery Cover recess found on most of the early Model 7, 40 and 8's.
I thought it might be of interest to some, since these seem to be very Rare.

I assume these must have been produced in their Tens of Thousands over the years,
but very few seem to have survived.
Not sure if these were optional extras or included with the Test Lead Set if it had the necessary Battery Cover.

Having only seen the occasional Photo, I didn't know much about this Probe and was
surprised to find that the Probe is actually Rubber Covered and not solid Bakelite as I thought.
It is basically an early version of the later Conical Test Lead Probe.
I actually prefer the design of this early Probe to the later ones.


Ian
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Old 21st Feb 2020, 10:08 pm   #2448
Phil G4SPZ
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Default Re: AVO Multimeter survey

Thanks Ian. Now you've posted that picture, I vaguely recognise it and I reckon I have the remnants of one, or something very like it, in my junk box. I'll look it out.
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Old 21st Feb 2020, 11:03 pm   #2449
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Default Re: AVO Multimeter survey

Hi Phil,

These Probes seem to be a surprisingly Rare AVO items.
They must have been made in their Thousands, but it's Rare to see them.

Surprisingly, the one I picked up is in pretty good shape. Not perfect, but the
Rubber is in very good shape.
I think the Rubber piece mid Shaft is either cut down or not original though.
I would expect this piece to be longer to match the shape of the Battery Cover recess.




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Old 21st Feb 2020, 11:59 pm   #2450
Phil G4SPZ
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Here’s mine. Like your example, it’s in black - surely they must have been made in red too? Perhaps not. Anyway, mine doesn’t have a rubber sleeve over the centre of the prod. You’re quite right, though, such a sleeve would have been a slightly larger diameter to fit in the recess. Here’s a thought... perhaps the sleeve was originally available in red, to be slipped on as an indicator whilst being used as the +ve probe? Or rather, to be pulled off if the long reach probe was being used as the negative.

Apart from a small portion of the insulation about 5mm long that has broken away near the tip, my example is in very good condition, the rubber is still flexible and shows no signs of cracking or perishing.

So, there are at least two of these things in existence! Unless, of course, you know different...

Does anyone have any old Avo catalogues or adverts showing this probe?

Phil
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Old 27th Feb 2020, 12:49 am   #2451
Aitor Eneko
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Default Re: AVO Multimeter survey

https://www.vintage-radio.net/forum/...d.php?t=151966
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Old 27th Feb 2020, 8:29 am   #2452
Phil G4SPZ
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Default Re: AVO Multimeter survey

The probes on the right of the picture in Aitor’s thread appear identical to the ones owned by Ian and myself, and they fit perfectly into the moulded shape within the battery cover. Hard to imagine they’re not Avo products.
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Old 27th Feb 2020, 12:12 pm   #2453
Superscope
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Thanks for the Link Aitor,

I knew you brought the subject up of this Probe before, but I was looking for
it in the wrong place.
Didn't realize it was on it's own unique thread.

Having re-studied the Photo of the Probes you posted, I would agree with Phil.
It makes no sense that the Two Probes on the Right are not the correct ones.
I re-posted your Photo here for reference.

I noticed that they are very slightly different, probably due to being different ages and Batches.

Interestingly for me, the one Second from Right has the exact same Rubber Sleeve that
mine has.
I had assumed mine had been cut down or replaced, but maybe this is not the case.
I would assume though, that at some point, probably very early on, this sleeve would have been longer to match the Battery Cover.
Maybe it was to tight a fit so was made shorter to accommodate that.

The Large Probe on the Left for sure, is a much later design, and whereas it might fit the
Battery Cover, it's shape would be very inconvenient to carry in the Lid.


Any more Photos anyone?


Ian
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Old 27th Feb 2020, 6:24 pm   #2454
Superscope
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AVO Advertisement from 1955 attached,
seemingly showing this Long Reach Probe!

Also showing what seems to be a short Sleeve after all.

Ian
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Old 27th Feb 2020, 7:28 pm   #2455
Phil G4SPZ
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Default Re: AVO Multimeter survey

That’s definitely the same probe, well spotted Ian! The picture in the advert suggests that every Avo 8 came with a long reach probe as well as a pair of leads, two ‘normal’ prods and two croc clips. If that’s the case, and given that the battery cover contained a purpose-made receptacle to hold said long reach probe, how come so few of these probes seem to have survived?

A lot of Avo 8s came with the plain flat metal battery cover. Perhaps the long prod, probe-holding battery covers etc were optional extras at additional cost.
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Old 27th Feb 2020, 11:42 pm   #2456
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Default Re: AVO Multimeter survey

Quote:
Originally Posted by Superscope View Post

......Any more Photos anyone?


Ian
That is all i have in my computer..
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Old 28th Feb 2020, 8:43 pm   #2457
The Philpott
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Default Re: AVO Multimeter survey

A further quirk related to battery compartment covers is this- there is a variation in the distance between the fixing screws. Not much, but just enough to ensure that i was unable to swap these over: An Aluminium one from a 48A and a Bakelite one from a 47A(S).

The threaded section that the fixing screws go into can also vary depending on whether the meter was intended to wear a metal or bakelite battery cover...(not to mention the large difference between the thickness of the aluminium/bakelite meter case..)

i don't have any early probes. Could there have been an arrangement where the factory subsequently considered early probes to be unsatisfactory/unsafe and issued a gratuity of some sort for those returned to them...? Or perhaps they simply were prone to seize up and got binned wholesale.

Dave
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Old 28th Feb 2020, 10:47 pm   #2458
Phil G4SPZ
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I must admit I’ve never really liked the (later) spring-loaded latching probes. Apart from the probe tip, which tends to slip off the contact being probed - not good in the confined environment around a B7G or B9A valve base - the sliding contact within the probe can go intermittently high resistance. I had to scrap one once that refused to respond to cleaning. I haven’t actually used one of the older black long-reach probes in anger, but I daresay they may suffer from the same problems.
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Old 19th Mar 2020, 1:07 pm   #2459
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Default Re: AVO Multimeter survey

I'm new on here and this is my first post so forgive if I screw it up! I'd like to add a few numbers to the AVO survey as follows:

Minor; 69724-1042
7; 71142-8749
7; 7887-A-1248
7; 7841-5566
7 MK2; 83959-a-360
8/9 MK4; 3817 370
8 MK5; 2241-0397
8 MK5; 03562 V/4/77
8 MK5; DC No. 037959 on label on the side with number 8 below it.

They are not all in working order and I can't remember where I gathered them over lots of years.
I may have one or two more.Time to have a sort out I think.
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