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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 25th Mar 2019, 8:53 pm   #2061
pmmunro
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Default Re: AVO Multimeter survey

Another early Avometer for the survey: 13-range (DC) Avometer, Serial No. 4151, (Douglas Street production) has just sold at auction for £102.

I would estimate its date of manufacture to be around 1932/3. It is in very good cosmetic condition and appears to have the original, fixed, test leads.

From the price it would seem that at least two people were very keen to have it.

PMM.
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Old 25th Mar 2019, 8:59 pm   #2062
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Default Re: AVO Multimeter survey

There are some very serious collectors about prepared to pay top price for these early Avos now.

I bought one of these some time ago for £20. Sadly, lost in the post.
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Old 25th Mar 2019, 9:34 pm   #2063
AndyGilham
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Default Re: AVO Multimeter survey

Quote:
Originally Posted by pmmunro View Post
Another early Avometer for the survey: 13-range (DC) Avometer, Serial No. 4151, (Douglas Street production) has just sold at auction for £102.

I would estimate its date of manufacture to be around 1932/3. It is in very good cosmetic condition and appears to have the original, fixed, test leads.

From the price it would seem that at least two people were very keen to have it.

PMM.
That was me..... I bid £100 could not go any higher..... so I sadly missed out!?
Does look in great condition.... I hope another forum member got it!

Andy
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Old 25th Mar 2019, 9:53 pm   #2064
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Default Re: AVO Multimeter survey

The 13-range you mention was in timewarp condition, remarkable. I didn't even consider bidding for it as DC only examples don't interest me as much as they do some people- so it will give someone else far more pleasure than it would me.

Dave
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Old 25th Mar 2019, 11:13 pm   #2065
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Default Re: AVO Multimeter survey

I did not buy it!
It is a very good example of Avo model 2, and i do not have one in my collection, but as i paid too much for my Avo model 4 i did not want to repeat my fault seeing it was going to be sold for a big amount.

Congratulations to the winner; hope to see it here soon!
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Old 26th Mar 2019, 10:15 pm   #2066
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Default Re: AVO Multimeter survey

Sinewave's acquisition led me to unearth my precision avometer and to look on web for serial numbers of others.
mine 441-567 (6625-99-104-5783)
others
247-466
272-566
589-967
709-670 (this is a Mk2 version)
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Old 27th Mar 2019, 6:45 pm   #2067
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Default Re: AVO Multimeter survey

I will email you shortly with some images of the peculiar Model 40(S) i am working on Richard.

Dave
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Old 28th Mar 2019, 8:45 pm   #2068
Electronpusher0
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Default Re: AVO Multimeter survey

I have Model 40 to report in. Purchased at my local car boot for a fiver, pretty good nick, battery cover and the black probe present, no corrosion in the battery compartment.
Serial 5826-B-951

Its odd because it definitely says model 40 on the front and on the dial (no Mk2) and yet it has the two PF sockets at the top which would indicate a Mk2.

Peter
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Old 28th Mar 2019, 9:02 pm   #2069
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Default Re: AVO Multimeter survey

PF sockets offered as an option on late Model 40 MkI, i believe.

Dave
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Old 28th Mar 2019, 10:45 pm   #2070
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Default Re: AVO Multimeter survey

You are right, i have an Avo 40, with PF and the interior is the same of a 40 mk2, there is a thread about it.
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Old 29th Mar 2019, 12:42 am   #2071
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Default Re: AVO Multimeter survey

Another for the survey :

EA113 , serial 6523-1177.

I got it in faulty condition from the usual auction site. The fault turned out to be one smoked resistor in a (fortunately) easily accessed place. It's a lovely thing, and didn't cost silly money (it was very grubby when I got it, but it cleaned up nicely).

Used almost daily.
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Old 9th Apr 2019, 6:40 pm   #2072
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I have just got hold of a Universal Avometer, model 48A in wooden box, complete with two shunts, multiplier and transformer in dusty/grubby condition,
but so far with the exception of the battery terminal that will have to be cleaned all seems to be good. There is a serial number on the dial plate that reads 1o656-143-R the is another plate on the lid of the box that give a different number. (possibly the meter has been replaced with another?)
I will post some photos after tea given time.
How is the battery connected in this model. ? A flying lead to the brass corner post and battery wedged up to the sprung brass fork ?
One of the wire wound pots is free but the other two seem to be seized.
Will investigate further. I would like to re-varnish the outside of the box. Can you still buy the old style brown varnish. I believe there should be some felt in the lid to protect the meter is that correct?
Mike.
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Old 9th Apr 2019, 8:43 pm   #2073
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Default Re: AVO Multimeter survey

I think there should be felt in the lid (there should certainly have been some around the sides of the base)

The original cell type had a screw terminal which engaged with the sprung fork, the other terminal was a wire en-bloc with the cell, which joined to the brass post at the corner of the battery compartment. This cell is obsolete so you are stuck with modifying the meter for a C or D cell (easily done)- but you might want to investigate the siezed pots before bothering! The meter might have been somewhere wet for a while causing the bakelite to swell. Completely siezed pots are uncommon - it may have had a hard life.

Dave
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Old 10th Apr 2019, 10:35 am   #2074
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Default Re: AVO Multimeter survey

Hi Mike,

I am assuming the Second Digit on the Serial Number is a 0 not an o ?

A Picture paints a Thousand Words.

The correct Battery for the 48A would have been a Rectangular/Square shape
approximately 30 x 30 x 80mm Equivalent to an Ever Ready R1662.

Although, being a Military Meter, the Batteries would have been
Military Branded items.
Somewhere on the Forum, there are Photo's of the original style Battery.

In the meantime, I have added some photos of the commercial Ever Ready Equivalent.

The Same Battery was used in the 36 Range Meters.

As Dave mentioned, the Battery is held onto the Positive Battery Terminal Fork by a Brass Nut.



As regards the Felt, yes there would have been Four small Squares of Felt, one on each side of the Meter compartment.
Two Pieces covering the Wooden Standouts along the sides and Two smaller pieces Top and Bottom.
It is likely you can still see where they were once Glued down.

There would also have been Two pieces on the Stands offs in the Lid to protect the meter,
and a Strip along the bottom to stop the Transformer and Multiplier rattling around.

Ian
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Old 10th Apr 2019, 11:57 am   #2075
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Default Re: AVO Multimeter survey

Yes, typo on the serial number. 0 and not o.
Now checked the meter on AC volts and surprise, its ok !! It was probably in a damp garage for a while and the case had more than a matchbox full of what looked like insect eggs plus two grubs. I found two woodworm holes in the case, but no more so need to find the Rentokill tin and give it a good squirt. Both wooden case hinges were seized, but after a lot of heat and WD 40, they are fine. A small repair was needed on the Bakelite case for the transformer and that was not easy as both large wingnuts were solid and they need to come off to remove the case. Will the aid of a heat gun directed on wingnut but away from transformer case, I eventually removed them and case now repaired. There is a piece of Paxolin bridging the glass tube on the middle coil in the multiplier and that was bent and ready to drop off so new one will be made with the correct thread. (6BA probably).
Mike.
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Old 10th Apr 2019, 8:21 pm   #2076
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Default Re: AVO Multimeter survey

The one time i broke open a piece of wood and saw furniture beetle grubs, they were pale pink in colour. I use chemicals if i want to kill them, but the new way some people use is to bag up the offending article in plastic and put it in the freezer at minus 18 for a week or two.

'Solid Wingnuts, Batman!', as the boy wonder might have said.. It almost sounds like it has been living on the coast for a while, exactly the sort of thing that would be snapped up by stupids and upcycled- which makes it satisfying it's being restored.

Dave
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Old 10th Apr 2019, 8:59 pm   #2077
sparkymike
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Default Re: AVO Multimeter survey

Perhaps I am stupid for restoring it !! Ha!
A few repairs to do to the case, but all minor, like a crack or split here and there. I use Titebond, the USA wood glue available easily over here. It blends nicely with the wood and does not leave a white line like PVA glues. I also have here the old pearl glue that you warm up in a pot and is the stuff that most old furniture was assembled with and that is a reversible fix as you can warm it up to release joints.
Getting back to main topic, I should post pictures shortly.
Mike.
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Old 10th Apr 2019, 9:13 pm   #2078
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Default Re: AVO Multimeter survey

Photos now here at last.
Mike.
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Old 11th Apr 2019, 7:31 am   #2079
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Default Re: AVO Multimeter survey

I have forgotten what the R denotes at the end of the serial number..someone will know.
What does the text on the battery cover read? I think the transformer traditionally goes in with wingnuts uppermost. (But you knew that!) Those copper oxide rectifiers are remarkably stable by and large, the 1947 one i have just used is good at mains voltage, and only loses about 300mV when shown 12vAC. The internal transformer is probably fine as well, but i find some of the low current terminations are easily knocked when working inside the meter.
Let us know how you get on, perhaps you could do a restoration thread.

Dave
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Old 11th Apr 2019, 1:51 pm   #2080
sparkymike
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Default Re: AVO Multimeter survey

Hi Dave, no text on battery cover, although it might be under a stuck on label hand written by a previous owner detailing battery use.
Now after a good clean with nothing but a damp dish cloth, the meter itself now looks pretty good.Two small splits on the wooden box have been repaired and need to buy some more Ruskins button polish.
Mike.
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