![]() |
![]() |
![]() |
![]() |
#121 |
Rest in Peace
Join Date: Nov 2004
Location: Antwerp, Belgium
Posts: 345
|
![]()
Sam's right. If the zeroing pot gives erratic results ("can't hit the right spot")it's probably dirt; if it "won't turn quite far enough" it's probably the 1.5 volt battery (high internal resistance) or possibly corrosion on the battery contacts, or on the leaf switches m-n and h-j. Try several new batteries before going inside !
Thanks for the serial number. |
![]() |
![]() |
![]() |
#122 |
Retired Dormant Member
Join Date: Apr 2006
Location: Shrewsbury, Shropshire, UK.
Posts: 67
|
![]()
I have an AVO model 8
8xxxx-C-359 |
![]() |
![]() |
![]() |
#123 |
Retired Dormant Member
Join Date: Apr 2006
Location: Chesterfield, Derbyshire, UK.
Posts: 52
|
![]()
Hello again SPCH. Further to my post at#117, more Avo details:
I have a 8 MkV in a plastic case, the ser no is on a tatty label, one on the side , one in the battery compartment, Ser No 48582 8V/12/74. The problem with this one is that the mechanical zero on the front of the meter does not work, it appears that the 2 prongs of the fork are not long enough to keep the back end of the meter needle in between them and when the adjuster is turned fully in an attempt to zero, the back end of the needle slips out. Have you come across this previously? I also recently acquired a Model 40, Ser No 407610 - 744, a year & a bit older than me. Seems to be in very good nick externally, with a bakelite front panel and a metal case in hammered silver finish. Serviceability not yet known but I have managed to remove the heavily corroded 4.5v batteries, no damage done, the 1.5v D cell is held in a modified holder. The top right hand of the front panel has a 3/4inch square smoothed into the ripples on which is engraved '6Bc TH' (inside a circle), with '5468 B.RD' underneath. There is a small metal plate screwed to the RH side which says 'Pool'. Rob Lines |
![]() |
![]() |
![]() |
#124 |
Hexode
Join Date: Oct 2004
Location: Cheltenham, Gloucestershire, UK.
Posts: 283
|
![]()
I have a Universal Avometer Model 7 6XXXX-7475
__________________
Now that's the kind of Long Wave I like ! (Severn Bore near Gloucester) |
![]() |
![]() |
![]() |
#125 |
Pentode
Join Date: Jun 2006
Location: Crawley Down, West Sussex, UK.
Posts: 151
|
![]()
My old Avo 7 bought for me by an old girlfriend 12 years ago in Horsham Sussex.
Ser Nn 20476-A-1250 And My Avo 8Mk 5 scrapped by work due to 10 amp shunt open circiut is 08550-8V/5/77 Can you tell the dates from these codes? |
![]() |
![]() |
![]() |
#126 |
Octode
Join Date: Jul 2004
Location: Dundee, UK.
Posts: 1,797
|
![]()
Dates of manufacture -
Model 7 - December 1950, Model 8 Mk V, May 1977 Send me a private message and I will see if I've got a 10A shunt - after the weekend. Best regards, Peter M. Munro |
![]() |
![]() |
![]() |
#127 |
Guest
Posts: n/a
|
![]()
Hi there,
I have a model 8 - 11947.h.664.D and an ex BBC model 7 - 66937-a-956. Hope this helps. |
![]() |
![]() |
#128 |
Tetrode
Join Date: Jun 2005
Location: Wilton, Salisbury, Wiltshire, UK.
Posts: 66
|
![]()
Mine's an AVO 8 mark V
Serial No' 09537 8V/5/78 Richard |
![]() |
![]() |
![]() |
#129 |
Pentode
Join Date: Nov 2005
Location: Crewe, Cheshire, UK.
Posts: 136
|
![]()
I have a Test Set Multirange No. 1 - looks like ex-RAF last calibrated in the mid-1970s.
On the bottom LHS of the scaleplate there are the following characters in the "ser. no." space: A.C.W./R 472 1094. This meter would not zero properly on the ohms div. 100 range - this was cured by cleaning the contacts on the 1A fuseholder in the battery compartment. Roger. |
![]() |
![]() |
![]() |
#130 |
Rest in Peace
Join Date: Nov 2004
Location: Antwerp, Belgium
Posts: 345
|
![]()
Thanks for all the recent inputs and for PMM's fielding of them in my absence. I shall be back in circulation in a week or so.
Please bear in mind that this thread is for Serial Number exchanges only. Any problems, fixes, or servicing issues should be posted in an appropriate (other) thread. Those of you who wish to submit problem/solution PMs are welcome to continue doing so: I'm happy to consolidate them to avoid multiplications - particularly of popular mis-diagnoses and tenacious erroneous myths. |
![]() |
![]() |
![]() |
#131 |
Retired Dormant Member
Join Date: Jul 2006
Posts: 1
|
![]()
New here, so apologies if not the right place.
I have an AVO 8 with no obvious serial number plate. There is a number on the scale plate No. 27033-C-854. It's in a rather sad state. It has obviously been dropped as there are cracks in the case radiating from one corner and the needle sticks. ...but it's available to anyone who would like to have it and is able to collect from SE London. |
![]() |
![]() |
![]() |
#132 |
Rest in Peace
Join Date: Nov 2004
Location: Antwerp, Belgium
Posts: 345
|
![]()
Thanks for the input. It's a "stalwart" Model 8 Mk I from August 1954 - almost the middle of the product's lifetime. Hope you can find a good home for it.
|
![]() |
![]() |
![]() |
#133 |
Retired Dormant Member
Join Date: Aug 2006
Location: london
Posts: 2
|
![]()
Looked at the meter on mine. It has no. 7742-7900. It's an avo 7. Does this mean it was made on the ninth month 1900.? Its made of bakerlite..!
|
![]() |
![]() |
![]() |
#134 |
Rest in Peace
Join Date: Nov 2004
Location: Antwerp, Belgium
Posts: 345
|
![]()
No; sorry Ramjet.
It DOES have the distinction of being the earliest Model 7 in thesurvey to date. Its serial number is 7900, and its date is July 1942. As this model was introduced in August 1938, the implication is that they'd been turning out about less tha 150 per month, pre-war. This went up to about 800 per month throughout most of World War II. As I've said before, given the labour-intensity of just calibrating these little darlings, who was left to do any fighting ![]() |
![]() |
![]() |
![]() |
#135 |
Triode
Join Date: Jul 2006
Location: Thetford, Norfolk, UK.
Posts: 22
|
![]()
Avo Model 8 Serial 28482 C 1154
Bought reconned from Charles Britain Radio of Upper St. Martin's Lane W.C.2 on 13th Jan 1962 for 15 Gns. Set of leads cost 10/- , perished long ago. Meter still works well. Also: Avo 9 Mk II Serial: 13877.568. Makes a good doorstop.
__________________
He's gone to make his meter. |
![]() |
![]() |
![]() |
#136 |
Pentode
Join Date: Jan 2006
Location: Almeria, Spain
Posts: 221
|
![]()
Looks like this thread may run and run,
2 AVOs Here; AVO 8 mk 5 ser 08338 8V/3/79 owned from new AVO 7 ser 18771-A-1050 as a sideline when a M*****i apprentice in the 70's I used to calibrate all the companys AVOs in the test equip dept. If I remember correctly the company had 500+ AVOs mostly 8 mk 2-4 these had a cal periodicity of 40 weeks if memory serves me well. I still have the hard skin on the inside of my fingers from rotating the knobs on the Fluke 760A Meter Calibrator ( excellent piece of kit) Mike A |
![]() |
![]() |
![]() |
#137 |
Retired Dormant Member
Join Date: Aug 2006
Location: london
Posts: 2
|
![]()
Hello again.! Interesting thread. Just pulled out my other Avo and it has on the meter "Type H.R.M" no. 632-1248. It is an Avo 7. not sure when it was manufactured.? these numbers are a little confusing.!
|
![]() |
![]() |
![]() |
#138 |
Octode
Join Date: Jul 2004
Location: Dundee, UK.
Posts: 1,797
|
![]()
Ramjet,
It looks like what you have is a High Resistance Avometer - much rarer than a Model 7 and a type which could be considered the forerunner to the Model 8. (There are in fact two versions of the HR Avometer). This fits with the serial number and the date of manufacture implicit in the serial number. For more details, see a previous thread on Avometer identification. Peter M. Munro |
![]() |
![]() |
![]() |
#139 |
Pentode
Join Date: Jul 2005
Location: Cambridge... in that country formally know as 'Great Britain'
Posts: 54
|
![]()
Just pulled mine out of the skip today
Avo 8 - 34592 555 Which I if I'm right is May 1955. AC and DC works fine but nothing from the Ohms side. The 1.5v battery (Vidor) reads 1.3 and the 15v (Ever Ready) 13.5, which I would have thought, would be enough to shift the needle. So I suppose that means it's zapped. All four terminals are black (no red one) and are solid with no plug socket in the centre. Cheers, Dave
__________________
"Ah! The news".CLICK-nothing-nothing-still nothing-"whistle-zzz...and now for the weather”. "Hmph"! |
![]() |
![]() |
![]() |
#140 |
Hexode
Join Date: Mar 2005
Location: London, UK.
Posts: 318
|
![]()
Another one for the list. An early Model 8 No. 84748-C-159.
Edward |
![]() |
![]() |