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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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3rd Jan 2019, 10:05 am | #1 |
Guest
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AVO Model 40 Variations.
I think there are the following variations for the AVO 40. Any extra information will be appreciated.
40 (MK1) Early aluminium case, horse shoe magnet battery cover with 2 probes 40 (MK1) Late aluminium case, modern magnet, battery cover with 3 probes 40 MK2 Marked MK2, aluminium case battery cover with 3 probes 40 MK2 Marked MK2 bakelite case battery cover with 3 probes 47A In wooden box 47S Marked with an "S" 48A Admiralty, wooden box with Multiplier 3600 Volts, shunt 120, shunt 480, transformer 60/240A |
23rd Jan 2019, 11:59 pm | #2 |
Guest
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Re: AVO Model 40 Variations.
I wonder if exists an AVO 40 mk1 with baquelite case.
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24th Jan 2019, 12:56 am | #3 |
Octode
Join Date: Jul 2004
Location: Dundee, UK.
Posts: 1,813
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Re: AVO Model 40 Variations.
Up until the Second World War, all full-size Avometers had aluminium cases. As this became a premuim material, principally reserved for aircraft, it would have been in short supply for Avometers.
I have no way of verifying that this is why Bakelite cases were introduced but it does seem likely. The most robust case of any Avometer is probably the cast aluminium case used on early Heavy Duty instruments, designed for the Great Western Railway but first supplied to the Western Region of British railways in 1948. For some reason, probably to reduce weight, later Heavy Duty meters had Bakelite cases which are nearly always damaged in surviving examples. PMM |
24th Jan 2019, 10:23 pm | #4 |
Guest
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Re: AVO Model 40 Variations.
thanks for your answer!
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24th Jan 2019, 10:31 pm | #5 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: AVO Model 40 Variations.
I've got a GWR Avo, but it's in bakelite.
__________________
Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
27th Jan 2019, 5:18 pm | #6 |
Guest
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Re: AVO Model 40 Variations.
I found another AVO 40 variant (in black)
40 (MK1) Early, aluminium case, horse shoe magnet battery cover with 2 probes. (1939-194?) 40 (MK1) Late, aluminium case, modern magnet, battery cover with 3 probes. (1940-1952) 40 (MK2) Marked MK2 but with old style binding posts, aluminium case. (AFTER 1945?-1946?) 40 MK2 Marked MK2, aluminium case battery cover with 3 probes (1952-1986) 40 MK2 Marked MK2 bakelite case battery cover with 3 probes (1970?-1986) 47A In wooden box 47S Marked with an "S" 48A Admiralty, wooden box with Multiplier 3600 Volts, shunt 120, shunt 480, transformer 60/240A Will appreciate opinions about dates and more possible variants or if anyone have more info about Avo 40 production Last edited by Guest; 27th Jan 2019 at 5:36 pm. |
27th Jan 2019, 5:31 pm | #7 |
Octode
Join Date: May 2016
Location: Oxfordshire/Bucks borders, UK.
Posts: 1,604
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Re: AVO Model 40 Variations.
I've got some Model 40s and 7s like that, with the PF terminals and the first type of connections. They're nice for the collection.
__________________
Avometer, vintage Fluke and Marconi collector. Also interested in vintage Yaesu and KW. |
27th Jan 2019, 8:23 pm | #8 |
Guest
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Re: AVO Model 40 Variations.
I added the MK1 with baquelite case during the WW2
40 (MK1) Early, aluminium case, horse shoe magnet battery cover with 2 probes. (1939-194?) 40 (MK1) With baquelite case due to WW2 40 (MK1) Late, aluminium case, modern magnet, battery cover with 3 probes. (1940-1952) 40 (MK2) Marked MK2 but with old style binding posts, aluminium case. (AFTER 1945?-1946?) 40 (MK2) Marked MK2, aluminium case battery cover with 3 probes (1952-1986) 40 (MK2) Marked MK2 bakelite case battery cover with 3 probes (1970?-1986) 47A In wooden box 47S Marked with an "S" 48A Admiralty, wooden box with Multiplier 3600 Volts, shunt 120, shunt 480, transformer 60/240A |
2nd Feb 2019, 4:56 pm | #9 |
Heptode
Join Date: Jul 2010
Location: Wellington, New Zealand.
Posts: 653
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Re: AVO Model 40 Variations.
Years ago I was going to try and collect every type of large Avometer I could find just for fun. I have about 40 or 50 (not sure as most are carefully stored away in sealed plastic boxes) ranging from Model 16 to Model 40. However I had no idea so many variants existed even of a single model and many thanks to Aito and others for posting this information. Have been forced to throw in the collecting towel as a) no more room b) no more room c) see a and b - but this really shows the huge variety of what I in my ignorance thought was a simple quest.
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3rd Feb 2019, 7:14 pm | #10 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,106
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Re: AVO Model 40 Variations.
It's astonishing how many variants were produced, the company bent over backwards to accommodate the requirements of customers- probably to their own disadvantage in some respects- efficiency and cost-effectiveness must surely start to suffer. (From what i am told this is what compromised Riley Coventry in the pre-war years- too many variants for their own good.)
The early archives are sketchy to the extent that it might still be feasible to find a variant that is effectively unknown. That would tempt me, but having 10 in full working order (and 16 avominors likewise) i would lose track (and run out of room) if there were any more. Dave |
8th Feb 2019, 12:42 am | #11 |
Guest
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Re: AVO Model 40 Variations.
Hello, i am looking for some photos of the wooden box that goes with the AVO 47. I will appreciate them.
By the way, speaking about photos, The Philpott, remember if you have time one day to show the photo of the guard/helmet in the Precision Avometer. Thanks! |