Component ID. - UK Vintage Radio Repair and Restoration Discussion Forum

Diabolical Artificer · 31st Jul 2018, 3:54 pm

Anyone come across this component before - see pic? At first I thought they were caps, but they have a gold blob at one end, also my C bridge struggles to measure them.

I tried a resistance test on the orange/orange/grey one, it measured 24 ohms, what the?
Could they be inductors?

Andy.

TonyDuell · 31st Jul 2018, 4:08 pm

I've seen inductors that look like that in some far-eastern units. So they could be inductors.

turretslug · 31st Jul 2018, 4:15 pm

Highly likely- VCRs used to abound in them for LPFs, BPFs, HPFs.... Also any other contemporary (c.1980s on) application that called for them. They range over a huge range of values from fractional uH to many mH- the saturation current goes down rapidly as the inductance value goes up, the low-value ones got used as supply decouplers but high value ones were very much AC component only use for filtering.

They're a good example of how component types became more and more difficult to tell apart- viz a recent thread where the topic was are they capacitors or MOVs or polyswitches!

Refugee · 31st Jul 2018, 4:15 pm

I have come across those. They are indeed inductors.
I managed to measure several on my bridge and came up with some readings that were plausible for the stripes.
They were in 100s of uh.

'LIVEWIRE?' · 31st Jul 2018, 10:47 pm

I first came across those (or similar ones) in cheap Hong Kong made car radios between 30 & 40 years ago, so they've been around a long while!

Diabolical Artificer · 1st Aug 2018, 6:00 am

So the consensus is inductors then, I'll try em on my bridge but have not had much luck with inductors especially if they have a high (ish) resistance component.

Thanks all, Andy.

31st Jul 2018, 3:54 pm	#1
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,658	Component ID. Anyone come across this component before - see pic? At first I thought they were caps, but they have a gold blob at one end, also my C bridge struggles to measure them. I tried a resistance test on the orange/orange/grey one, it measured 24 ohms, what the? Could they be inductors? Andy. Attached Thumbnails __________________ Curiosity hasn't killed this cat...so far.

31st Jul 2018, 4:08 pm	#2
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: Component ID. I've seen inductors that look like that in some far-eastern units. So they could be inductors.

31st Jul 2018, 4:15 pm	#3
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,394	Re: Component ID. Highly likely- VCRs used to abound in them for LPFs, BPFs, HPFs.... Also any other contemporary (c.1980s on) application that called for them. They range over a huge range of values from fractional uH to many mH- the saturation current goes down rapidly as the inductance value goes up, the low-value ones got used as supply decouplers but high value ones were very much AC component only use for filtering. They're a good example of how component types became more and more difficult to tell apart- viz a recent thread where the topic was are they capacitors or MOVs or polyswitches!

31st Jul 2018, 4:15 pm	#4
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,553	Re: Component ID. I have come across those. They are indeed inductors. I managed to measure several on my bridge and came up with some readings that were plausible for the stripes. They were in 100s of uh.

31st Jul 2018, 10:47 pm	#5
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Component ID. I first came across those (or similar ones) in cheap Hong Kong made car radios between 30 & 40 years ago, so they've been around a long while!

1st Aug 2018, 6:00 am	#6
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,658	Re: Component ID. So the consensus is inductors then, I'll try em on my bridge but have not had much luck with inductors especially if they have a high (ish) resistance component. Thanks all, Andy. __________________ Curiosity hasn't killed this cat...so far.