UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Test Gear and Workshop Equipment

Notices

Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

Reply
 
Thread Tools
Old 19th Nov 2019, 12:06 pm   #2361
AndyGilham
Pentode
 
Join Date: Oct 2016
Location: Dover, Kent, UK.
Posts: 237
Default Re: AVO Multimeter survey

A few more meters have been donated to the Megger collection

Avometer Model 8 Mk 3 107785-1169 (November 1969)
Avometer Model 8 Mk 3 93490-269 (February 1969)
Avometer Model 8 Mk 4/9Mk 4 - No Serial Number
Avometer Model 10 00165 10/7/77 (July 1977)

Andy
AndyGilham is offline   Reply With Quote
Old 19th Nov 2019, 12:51 pm   #2362
Electrical
Hexode
 
Electrical's Avatar
 
Join Date: Jul 2008
Location: Gateshead, Tyne & Wear, UK.
Posts: 339
Default Re: AVO Multimeter survey

I have just been reading about the International Rectifier Zener diode Tester and having just found mine, I have taken a few pictures of it, please see attached.
The serial number is 210-763.
I any one would like a PDF copy of the manual, I can scan it and clean it up and posted hear.
Regards Stan.
Attached Thumbnails
Click image for larger version

Name:	PB190065.jpg
Views:	118
Size:	133.4 KB
ID:	193937   Click image for larger version

Name:	PB190066.jpg
Views:	129
Size:	84.4 KB
ID:	193938   Click image for larger version

Name:	PB190067.jpg
Views:	131
Size:	34.5 KB
ID:	193939   Click image for larger version

Name:	PB190068.jpg
Views:	126
Size:	119.4 KB
ID:	193940   Click image for larger version

Name:	PB190069.jpg
Views:	119
Size:	70.5 KB
ID:	193941  

__________________
Junk accumulates to fill the space available.
Electrical is offline   Reply With Quote
Old 19th Nov 2019, 1:23 pm   #2363
micheal
Pentode
 
Join Date: Mar 2007
Location: Croydon, London, UK.
Posts: 113
Default Re: AVO Multimeter survey

Hi Stan,

I would very much like a copy of the manual.
It looks like they were all made in July 1963 so far.

Many thanks Mike.
micheal is offline   Reply With Quote
Old 19th Nov 2019, 4:26 pm   #2364
pmmunro
Octode
 
Join Date: Jul 2004
Location: Dundee, UK.
Posts: 1,826
Default Re: AVO Multimeter survey

I have a scan of the manual which I'll post later today.

PMM
pmmunro is online now   Reply With Quote
Old 19th Nov 2019, 5:05 pm   #2365
Electrical
Hexode
 
Electrical's Avatar
 
Join Date: Jul 2008
Location: Gateshead, Tyne & Wear, UK.
Posts: 339
Default Re: AVO Multimeter survey

Hello Micheal
Please find attached a PDF copy of the AVO International Rectifier zener diode selector working instructions, parts list and circuit diagram.
Note the PDF copy is 200% bigger than the original.
Regards Stan.
Attached Files
File Type: pdf AVO-IR Zener Tester 200.pdf (170.3 KB, 193 views)
__________________
Junk accumulates to fill the space available.
Electrical is offline   Reply With Quote
Old 19th Nov 2019, 11:05 pm   #2366
Superscope
Octode
 
Join Date: May 2017
Location: St Austell, Cornwall, UK.
Posts: 1,018
Default Re: AVO Multimeter survey

Many thanks Stan,

That's a really nice Meter you have there.
I didn't expect to see one in such good Condition with Case and Leads.

The User Manual is a nice Bonus.


Ian
Superscope is offline   Reply With Quote
Old 20th Nov 2019, 12:41 pm   #2367
micheal
Pentode
 
Join Date: Mar 2007
Location: Croydon, London, UK.
Posts: 113
Default Re: AVO Multimeter survey

Hi Stan,

Many thanks for PDF copy of manual.

Mike
micheal is offline   Reply With Quote
Old 27th Nov 2019, 2:17 pm   #2368
JohanBee
Triode
 
Join Date: Apr 2014
Location: Stockholm, Sweden
Posts: 20
Default Re: AVO Multimeter survey

Hi folks, I’ve come to own an AVO-meter type 21-S (the S probably for the Swedish edition) dated 1972.

It originates from the Swedish Navy former spare stock, is never used and contains all accessories including the old batteries in the original case.

Is this a collectable item that should not be used or can I start using it, as I have no good analogue meter at the moment?

I just ask this from you specialists out there to advice me. I’m not in need to use it if it’s a collectors item that should be kept unused, but I’m myself not a collector of instruments.

It has been in to regulary check at the Navy depot service dept, last time in 1979, so it have some minor scratches from handling there.

I attach some photos of it to judge and give a wiev of the Swedish Edition backside instruction plate, delivery note and Navy inventory markings.
Attached Thumbnails
Click image for larger version

Name:	F009B610-C93E-4896-906E-0AD636F9990F.jpg
Views:	186
Size:	79.6 KB
ID:	194465   Click image for larger version

Name:	90A16145-C92D-41DF-B1B8-4726F5431D04.jpg
Views:	132
Size:	100.5 KB
ID:	194466   Click image for larger version

Name:	C4309D9C-CA40-41B5-BC47-C25CF21DC890.jpg
Views:	122
Size:	65.7 KB
ID:	194467  
JohanBee is offline   Reply With Quote
Old 27th Nov 2019, 3:41 pm   #2369
The Philpott
Dekatron
 
The Philpott's Avatar
 
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,181
Default Re: AVO Multimeter survey

My own opinion...
Collectable? Yes.
Rare? probably.
Use it or put it in a glass case? Use it- with new batteries- (but not Duracells.) You could always get another analogue meter to back it up, for outside jobs or dirty jobs.

It is likely that a collector would pay good money for it (they are popular) but it would perhaps be better if you could use it, see if it needs any attention, and benefit from having what is an interesting link between analogue and digital technology..? When these meters are working, apparently they are very good.

Dave

Last edited by The Philpott; 27th Nov 2019 at 3:46 pm.
The Philpott is offline   Reply With Quote
Old 27th Nov 2019, 5:22 pm   #2370
hilitevr
Pentode
 
Join Date: Jul 2006
Location: Sidcup, Greater London, UK.
Posts: 122
Default Re: AVO Multimeter survey

Hi Dave, why not Duracells?
__________________
Regards

Trevor BVWS member
hilitevr is offline   Reply With Quote
Old 27th Nov 2019, 5:31 pm   #2371
Refugee
Dekatron
 
Refugee's Avatar
 
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,581
Default Re: AVO Multimeter survey

Quote:
Originally Posted by hilitevr View Post
Hi Dave, why not Duracells?
They leak and rot the inside of your meter.
Refugee is online now   Reply With Quote
Old 27th Nov 2019, 5:43 pm   #2372
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 23,215
Default Re: AVO Multimeter survey

Type 21-S ? That's a new AVO variant on me. The case seems to be the same as the EA113, but I wonder if the 21-S is a simpler, passive meter without the amplifiers of the EA113?

Yes, it's interesting. Yes, it's worth keeping. But I'd rather see these things being used.

The almost identical looking EA113 seems to fetch crazily high prices on auction sites. It's believed to be because AVO list these as necessary to performing calibration on their later valve testers, and the valve testers are cult items amongst guitarists and hifi extremists. These factors elevate prices. I don't think the 21-S will have the same price hype factor as the EA113.

So, you've got a nice unit, with all the paperwork and things. Worth keeping together

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is offline   Reply With Quote
Old 27th Nov 2019, 8:40 pm   #2373
Sinewave
Octode
 
Sinewave's Avatar
 
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
Default Re: AVO Multimeter survey

21-S, wonder if it's a variant renamed of the EA113. Agreed the price of these tend to get high, luckily I have a secret stash of these meters.
__________________
Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW.
Sinewave is offline   Reply With Quote
Old 27th Nov 2019, 9:06 pm   #2374
Phil G4SPZ
Dekatron
 
Phil G4SPZ's Avatar
 
Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
Posts: 4,756
Default Re: AVO Multimeter survey

What a fascinating find!

My knowledge of Swedish is nil, but it’s possible to deduce from the instruction plate that this is a passive meter with 20,000 OPV sensitivity and uses 15 volt and 1.5 volt batteries for the resistance ranges only. Hence it seems to be virtually the same as an Avo Model 9, mark V or later, in an Avo EA113 case.
__________________
Phil

Optimist [n]: One who is not in possession of the full facts

Last edited by Phil G4SPZ; 27th Nov 2019 at 9:08 pm. Reason: Update
Phil G4SPZ is offline   Reply With Quote
Old 27th Nov 2019, 9:22 pm   #2375
AndyGilham
Pentode
 
Join Date: Oct 2016
Location: Dover, Kent, UK.
Posts: 237
Default Re: AVO Multimeter survey

The EA113 was the Uk market version of this instrument. The original design was the Avometer models 14, 15, 16 and 20. These actually came from demand overseas, and so were designed for the foreign market. The EA113 came along a little later.
I have never heard of a model 21S but yes it seems to be a Swedish Special.
The collection I have at Megger (formerly Avo) for our museum includes 2 Ea113, but none of the others models.
What a fantastic find..... Keep it in good condition!

Andy
AndyGilham is offline   Reply With Quote
Old 27th Nov 2019, 9:52 pm   #2376
Pamphonica
Nonode
 
Pamphonica's Avatar
 
Join Date: Mar 2008
Location: Virginia Water, Surrey, UK.
Posts: 2,916
Default Re: AVO Multimeter survey

Surely this is most likely a Swedish export version of the model 20, not the electronic EA113.
__________________
Jeremy, G8MLK, BVWTVM Friend, VMARS, BVWS Secretary.
www.pamphonic.co.uk www.bttt.org.uk
Pamphonica is online now   Reply With Quote
Old 28th Nov 2019, 12:46 am   #2377
pmmunro
Octode
 
Join Date: Jul 2004
Location: Dundee, UK.
Posts: 1,826
Default Re: AVO Multimeter survey

A range of four Avometers, intended for export sales, was released in August 1967. These were Models 14, 15, 16 and 20. All of them shared the case style of the EA113 and were passive instruments with a sensitivity of 20,000 ohms per volt. The ranges provided are shown in the attachment. Introduction on the home market was not intended to be immediate, and as far as I am aware, never happened. They certainly reached Canada and Australia and manuals were printed in English, French and German.

The Model 14 was the basic version, without alternating current ranges and an accuracy of +/- 2% of fsd (DC) and 2,25% fsd (AC). The Model 15 had an accuracy of +/- 1.5% of fsd on DC and 2.25% of fsd on AC. Models 16 & 20 were 1% of fsd on DC and 1.5% of fsd on AC. The good accuracy was attributed to the use of metal film resistors. In common with the recently developed Model 8 Mk III, these meters had thermistor temperature compensation.

They're rather nice meters, but the highest current range is only 3A.

The Model 21 replaced the Model 20 within a year or two and measured current up to 6A and the highest resistance range, using an internal 15V battery, was extended to 10Mohms.

I don't know the significance of the 'S' suffix on the Swedish Model 21. It may just indicate that it was for export to Sweden, which seems most likely as it doesn't look to be screened as a Model 8S, for example, would be.

PMM
Attached Files
File Type: doc Specifications Models 14 to 21.doc (73.5 KB, 141 views)
pmmunro is online now   Reply With Quote
Old 28th Nov 2019, 12:31 pm   #2378
scotty48
Diode
 
Join Date: Nov 2019
Location: Gloucester, Gloucestershire, UK.
Posts: 1
Default Re: AVO Multimeter survey

Hi I have a AVO 8 serial number: 42617-C-1255
scotty48 is offline   Reply With Quote
Old 28th Nov 2019, 2:59 pm   #2379
JohanBee
Triode
 
Join Date: Apr 2014
Location: Stockholm, Sweden
Posts: 20
Default Re: AVO Multimeter survey

Thanks for all information of my AVO-meter Model 21S.
I now understand it is a quite rare export Swedish version of the 6A extended current version of Model 20 and I’ll take good care of it. Also the extended scales with multiples of 3X & 12X are also more convinient for servicing, but lacking the full scale 6X-markings?, you have to multply or divide in your head!

It’s not any active electronics in it, so passive and the batteries 1,5V AA & 15V are only used for the Ohm ranges.
I have looked for the AVO serial No. but can’t find any. Maybe it is hidden inside, so i have to part it...but have not done.

It and other AVO products was imported by the swedish company SRA (Svenska Radioaktiebolaget), a large very serious radio/communication company (they even manufactured tubes/valves under the brand SER & Ericsson) , founded in 1919 by five other large swedish companies to do research and designs of the then new radio electronics industry. In the 60’s it was mainly owned by Ericsson and was later merged to Ericsson.

I have lifted the back side plate and it vas very difficult as it was like glued with some sticky resin on all four sides. I can see some prying marks in the two lower corners, probably from the service/inspection guys when pryed open for inserting batteries by testing.

I did not put any batteries in it (fear of leaking) as I better use my digital meters for Ohmic measurements. But I’ll use it for voltage measurments in tube radios, as the stated values often is recorded with an analogue 20.000 Ohm/V meter.

I see the last inspection was the 29th October 1984 on the label on top. That was not recorded on the units slip. The next inspection should then havebeen done be in October 1985, but it was probably decomissioned and just left in storage.

I bought it in the beginning of the 90’s from a (now closed) Navy surplus shop and have not used, just stored it.
I now asked about it when I joined this forum and found out there was so much expertise and knowledge collected here.

I will use it very sparsly and all time keep it in the original case and not move it around on my service bench, to keep it in the good condition as it is.

I used a couple of sucktion cups from a bathroom utility to pull off the lid, instead of prying. Can recommend that when you can’t grip a smoth furface. I was afraid there was a forgotten battery that have leaked (Duracell?), but the sticky and partally dried stuff seemed to be like solder flux and was disolved and cleaned away with isoprophylic alkohol.

I have attached some more photos of it including diagram and if someone wants better resolution for dokumentation, you can PM me and I’ll send by eMail.

Now preparing to go south a couple of month to escape the worst winter weather here in Sweden, so I’ll have no access to the meter for some time for new photos.
Attached Thumbnails
Click image for larger version

Name:	0FB3BA4D-209D-4624-9243-34630474DE48.jpg
Views:	181
Size:	87.4 KB
ID:	194547   Click image for larger version

Name:	6C079B0C-C561-4C80-B37E-8353B8888985.jpg
Views:	173
Size:	79.3 KB
ID:	194548   Click image for larger version

Name:	7EBF42EB-5067-46FC-B4EB-53C27253A7D5.jpg
Views:	142
Size:	120.4 KB
ID:	194549   Click image for larger version

Name:	95F225E3-9423-4C51-938D-AFC447ADC620.jpg
Views:	159
Size:	75.3 KB
ID:	194550   Click image for larger version

Name:	3B51C1C4-F8DB-4BE1-B77D-83B5600DF777.jpg
Views:	145
Size:	73.4 KB
ID:	194551  

JohanBee is offline   Reply With Quote
Old 29th Nov 2019, 8:13 am   #2380
AndyGilham
Pentode
 
Join Date: Oct 2016
Location: Dover, Kent, UK.
Posts: 237
Default Re: AVO Multimeter survey

A new Avometer Model D for the Megger collection.
This is an interesting one.

Original serial number is 1269-1140 (November 1940). As detailed on scaleplate and in pencil on rear of the movement. The rear of movement also states 17-06-49 and 1949 is also printed on the scaleplate next to the serial number.

This implies the scale was replaced in 1949? but still lined with the original serial number.

Top center of the scale has the A<Crown>M for Air Ministry.
Bottom center of scaleplate has Air Ministry Phenon and under that Ref.10S/10610 and then under that LGC/R/12/67
Bottom left of scaleplate R.A.F.27

Front panel is a Model 40 moulded panel

Rear instruction plate is full length (rather than Model 5 style), but reads 10A/10610. So this raises some questions, when did the specification from 10A/10610 to 10S/10610 change over? Clearly there were 10A/10610 plates manufactured for Model 40 based instruments.

Andy
Attached Thumbnails
Click image for larger version

Name:	IMG_4280.jpg
Views:	132
Size:	45.3 KB
ID:	194591   Click image for larger version

Name:	IMG_4285.jpg
Views:	126
Size:	74.0 KB
ID:	194592   Click image for larger version

Name:	IMG_4266.jpg
Views:	111
Size:	40.8 KB
ID:	194593  
AndyGilham is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 1:25 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2024, Paul Stenning.