What are these? - UK Vintage Radio Repair and Restoration Discussion Forum

stuart_morgan_64 · 28th Sep 2020, 11:17 am

Just in case they maybe useful, does anyone know what these are?

M0FYA Andy · 28th Sep 2020, 11:43 am

Coil formers?

Andy

stuart_morgan_64 · 28th Sep 2020, 11:51 am

Posible there are gaps for the windings to go from oe section to another

HamishBoxer · 28th Sep 2020, 12:55 pm

Some sort of RF choke??

sortedradio · 28th Sep 2020, 1:08 pm

Are the made from aluminium? If so they look like some push on transistor heatsinks I've seen.

Radio Wrangler · 28th Sep 2020, 1:13 pm

Those slots would have been expensive to cut in an aluminium heatsink, and not necessary. Bushes for threads wouldn't have been needed either.

If a hard plastic or bakelite, then I think they're coil formers'

Any clues in where they came from?

David

ionburn · 28th Sep 2020, 1:59 pm

To me those slots on the base look like they are for some form of locking mechanism. I am fairly certain I have seen a similar method of locking before but my memory fails me.

Silicon · 28th Sep 2020, 2:10 pm

Can you read the text in the recess?

WME_bill · 28th Sep 2020, 2:33 pm

I suggest formers for wirewound resistors. I had a Pye potentiometer unit with a number of similar coils for high stability close tolerance resistors for the decade multipliers. I am assuming the material is ebonite.
A much larger version of the sort of bobbin we see inside an Avo 7 or 8, or the Universal Avominor.
wme_bill

McMurdo · 28th Sep 2020, 6:39 pm

I was going to say a coil former for a spark transformer off a gas appliance but then again they're normally quite cheap plasticky things, this looks rather more robust

joebog1 · 28th Sep 2020, 11:39 pm

TO5 sized transistor heatsinks.

Joe

Diabolical Artificer · 29th Sep 2020, 7:05 am

"TO5 sized transistor heatsinks." was going to suggest that too as Martin did but "Those slots would have been expensive to cut in an aluminium heatsink, and not necessary." as David says, same goes for the threaded inserts and look at the size, way too big for TO5.

Also being made out of ali & not a ferrite type material EG a conductor without a insulated covering rules out coil formers surely.

Andy.

Bobdger · 29th Sep 2020, 7:11 am

Possible that it’s a shaft coupling in a drive system. This acts as a damper for slight miss alignment of the two shafts. Motor to reduction gear box – pump etc.

Bob

duncanlowe · 29th Sep 2020, 3:44 pm

Quote:

Originally Posted by Bobdger

Possible that it’s a shaft coupling in a drive system. This acts as a damper for slight miss alignment of the two shafts. Motor to reduction gear box – pump etc.

Bob

It does look a bit like one of those. I have one somewhere because one day it will 'come 'in'. But its a flexible plastic and has much thinner rings, joined in different places. Similar to this one: https://uk.rs-online.com/web/p/couplings/4106512/

stuart_morgan_64 · 29th Sep 2020, 4:24 pm

Thanks, lot's of suggestions. They are plastic. The text reads A.P. 5461 J.D. the chap who they came from worked on medical equipment in a hospital. They are rigid. Plug is for size guide.

28th Sep 2020, 11:17 am	#1
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	What are these? Just in case they maybe useful, does anyone know what these are? Attached Thumbnails

28th Sep 2020, 11:43 am	#2
M0FYA Andy Nonode Join Date: May 2007 Location: Preston, Lancashire, UK. Posts: 2,511	Re: What are these Coil formers? Andy

28th Sep 2020, 11:51 am	#3
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	Re: What are these Posible there are gaps for the windings to go from oe section to another

28th Sep 2020, 12:55 pm	#4
HamishBoxer Dekatron Join Date: Aug 2007 Location: W.Butterwick, near Doncaster UK. Posts: 8,932	Re: What are these? Some sort of RF choke?? __________________ G8JET BVWS Archivist and Member V.M.A.R.S

28th Sep 2020, 1:08 pm	#5
sortedradio Heptode Join Date: Jan 2008 Location: Sheffield, South Yorkshire, UK. Posts: 655	Re: What are these? Are the made from aluminium? If so they look like some push on transistor heatsinks I've seen. __________________ Martin BVWS member GQRP Club

28th Sep 2020, 1:13 pm	#6
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,871	Re: What are these? Those slots would have been expensive to cut in an aluminium heatsink, and not necessary. Bushes for threads wouldn't have been needed either. If a hard plastic or bakelite, then I think they're coil formers' Any clues in where they came from? David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

28th Sep 2020, 1:59 pm	#7
ionburn Heptode Join Date: Dec 2014 Location: Lincoln, Lincolnshire, UK. Posts: 583	Re: What are these? To me those slots on the base look like they are for some form of locking mechanism. I am fairly certain I have seen a similar method of locking before but my memory fails me.

28th Sep 2020, 2:10 pm	#8
Silicon Nonode Join Date: Jun 2007 Location: Coulsdon, London, UK. Posts: 2,163	Re: What are these? Can you read the text in the recess?

28th Sep 2020, 2:33 pm	#9
WME_bill Octode Join Date: Oct 2007 Location: Exeter, Devon, UK. Posts: 1,554	Re: What are these? I suggest formers for wirewound resistors. I had a Pye potentiometer unit with a number of similar coils for high stability close tolerance resistors for the decade multipliers. I am assuming the material is ebonite. A much larger version of the sort of bobbin we see inside an Avo 7 or 8, or the Universal Avominor. wme_bill

28th Sep 2020, 6:39 pm	#10
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,271	Re: What are these? I was going to say a coil former for a spark transformer off a gas appliance but then again they're normally quite cheap plasticky things, this looks rather more robust __________________ Kevin

28th Sep 2020, 11:39 pm	#11
joebog1 Banned Join Date: Jun 2015 Location: Mareeba, North Queensland, Australia Posts: 2,704	Re: What are these? TO5 sized transistor heatsinks. Joe

29th Sep 2020, 7:05 am	#12
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,661	Re: What are these? "TO5 sized transistor heatsinks." was going to suggest that too as Martin did but "Those slots would have been expensive to cut in an aluminium heatsink, and not necessary." as David says, same goes for the threaded inserts and look at the size, way too big for TO5. Also being made out of ali & not a ferrite type material EG a conductor without a insulated covering rules out coil formers surely. Andy. __________________ Curiosity hasn't killed this cat...so far.

29th Sep 2020, 7:11 am	#13
Bobdger Hexode Join Date: Jan 2015 Location: Rustington, West Sussex, UK. Posts: 383	Re: What are these? Possible that it’s a shaft coupling in a drive system. This acts as a damper for slight miss alignment of the two shafts. Motor to reduction gear box – pump etc. Bob __________________ Bob, BVWS member

29th Sep 2020, 4:24 pm	#15
stuart_morgan_64 Heptode Join Date: Aug 2004 Location: Woodbridge, Suffolk, UK. Posts: 501	Re: What are these? Thanks, lot's of suggestions. They are plastic. The text reads A.P. 5461 J.D. the chap who they came from worked on medical equipment in a hospital. They are rigid. Plug is for size guide.