Receiver Output Limiter Component - UK Vintage Radio Repair and Restoration Discussion Forum

M0FYA Andy · 3rd Apr 2017, 1:56 pm

Can anyone suggest what the tubular components are in this little unit, please?

I'm not sure how its meant to be used, but as it has a jack plug on a flying lead and a jack socket, I'm guessing just in line with a pair of headphones.

As the devices are marked red at one end and blue at the other, I'm thinking maybe some sort of diode, maybe akin to a Westector?

Many thanks,

Andy

ms660 · 3rd Apr 2017, 2:08 pm

Possibly similar to this description (no pics) Scroll down to R.I.S(3) article:

http://www.rnmuseumradarandcommunica...tion%20one.pdf

Lawrence.

Alf · 3rd Apr 2017, 2:39 pm

I think they will be diodes, probably it's some form of speech clipper.

G4XWDJim · 3rd Apr 2017, 3:22 pm

I think they are copper oxide rectifiers. I took some apart once.

Jim

3rd Apr 2017, 3:52 pm

Having them a) with an end mark, b) back to back and c) two different types I would go along with it being a limiter.

3rd Apr 2017, 3:53 pm

Also the circuit is merrily in parallel with the jack.

M0FYA Andy · 3rd Apr 2017, 3:58 pm

Thanks, I was thinking copper oxide diodes/rectifiers, hence I wondered if they are similar to Westectors.

Andy

Radio Wrangler · 3rd Apr 2017, 4:13 pm

Not for speech clipping, these things are to stop hearing damage from static crashes when people are wearing sensitive headphones. Some receivers have adjustable noise clippers, but some don't.

David

russell_w_b · 3rd Apr 2017, 4:39 pm

They're stacks of diodes in those paxolin tubes. They look like a smaller version of the high-voltage diodes used in a Beethoven shotfiring exploder.

Little coppery-looking discs, like tiny sweeties. ('scuse the technical description.

).

M0FYA Andy · 3rd Apr 2017, 5:21 pm

One interesting detail is that there are two versions with different stores numbers, so they must have different characteristics. I wonder if they were specially made or had commercial equivalents?
Andy

ms660 · 3rd Apr 2017, 6:02 pm

I wonder if they are Sentercel types.

Lawrence.

3rd Apr 2017, 1:56 pm	#1
M0FYA Andy Nonode Join Date: May 2007 Location: Preston, Lancashire, UK. Posts: 2,511	Receiver Output Limiter Component Can anyone suggest what the tubular components are in this little unit, please? I'm not sure how its meant to be used, but as it has a jack plug on a flying lead and a jack socket, I'm guessing just in line with a pair of headphones. As the devices are marked red at one end and blue at the other, I'm thinking maybe some sort of diode, maybe akin to a Westector? Many thanks, Andy Attached Thumbnails

3rd Apr 2017, 2:08 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Receiver Output Limiter Component Possibly similar to this description (no pics) Scroll down to R.I.S(3) article: http://www.rnmuseumradarandcommunica...tion%20one.pdf Lawrence.

3rd Apr 2017, 2:39 pm	#3
Alf Hexode Join Date: May 2005 Location: Wigan, Greater Manchester, UK. Posts: 479	Re: Receiver Output Limiter Component I think they will be diodes, probably it's some form of speech clipper.

3rd Apr 2017, 3:22 pm	#4
G4XWDJim Octode Join Date: Oct 2008 Location: Littlehampton, West Sussex, UK. Posts: 1,465	Re: Receiver Output Limiter Component I think they are copper oxide rectifiers. I took some apart once. Jim

3rd Apr 2017, 3:52 pm	#5
Guest Guest Posts: n/a	Re: Receiver Output Limiter Component Having them a) with an end mark, b) back to back and c) two different types I would go along with it being a limiter.

3rd Apr 2017, 3:53 pm	#6
Guest Guest Posts: n/a	Re: Receiver Output Limiter Component Also the circuit is merrily in parallel with the jack.

3rd Apr 2017, 3:58 pm	#7
M0FYA Andy Nonode Join Date: May 2007 Location: Preston, Lancashire, UK. Posts: 2,511	Re: Receiver Output Limiter Component Thanks, I was thinking copper oxide diodes/rectifiers, hence I wondered if they are similar to Westectors. Andy

3rd Apr 2017, 4:13 pm	#8
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,876	Re: Receiver Output Limiter Component Not for speech clipping, these things are to stop hearing damage from static crashes when people are wearing sensitive headphones. Some receivers have adjustable noise clippers, but some don't. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

3rd Apr 2017, 4:39 pm	#9
russell_w_b Dekatron Join Date: Jul 2007 Location: Penrith, Cumbria, UK. Posts: 3,687	Re: Receiver Output Limiter Component They're stacks of diodes in those paxolin tubes. They look like a smaller version of the high-voltage diodes used in a Beethoven shotfiring exploder. Little coppery-looking discs, like tiny sweeties. ('scuse the technical description. ). __________________ Regds, Russell W. B. G4YLI.

3rd Apr 2017, 5:21 pm	#10
M0FYA Andy Nonode Join Date: May 2007 Location: Preston, Lancashire, UK. Posts: 2,511	Re: Receiver Output Limiter Component One interesting detail is that there are two versions with different stores numbers, so they must have different characteristics. I wonder if they were specially made or had commercial equivalents? Andy

3rd Apr 2017, 6:02 pm	#11
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Receiver Output Limiter Component I wonder if they are Sentercel types. Lawrence.