Is it a cap ? - UK Vintage Radio Repair and Restoration Discussion Forum

Pete_kaye · 28th Aug 2009, 5:10 pm

this came from a junk box and seems to behave like a capacitor but it says 'Type 802 resistor'on the front.Here are 2 photos...

Colin · 28th Aug 2009, 5:37 pm

I believe Micamold made both caps and resistors in the same brown molded shape. Your example has 'resistor' on the side so I guess it's a resistor (that looks like a cap).

Geoff 555 · 28th Aug 2009, 10:45 pm

Hello, how interesting I have some capacitors with the same 'arrow' and paint 'dots' also Micamold, the radio is American and dated 1953.
Cheers.
Geoff.

Darren-UK · 29th Aug 2009, 1:23 am

The arrow, for a brief moment, made me think it was a diode - then I saw the coloured dots and read Colin's post. Reading Geoff's post, does it mean that same arrow appeared on the moulding regardless of what the component actually is?

The above aside, would I be correct in assuming the arrow (when on a resistor) serves to indicate the sequence of reading the colour codes?

Radio_Dave · 29th Aug 2009, 9:57 am

Hi Pete,

What colour is it? It was my understanding that resistors of this type were coloured black and capacitors brown.

Anyhow, yes it is a resistor. The arrow indicates the direction in which the dots should be read (in capacitors too), so it's orange (I think), black, brown = 300R

David

brianc · 29th Aug 2009, 10:17 am

If it's a cap (unlikely) it will be a mica cap (micamould!!) and therefore would be very unlikely to leak. Have you measured it! I bet Dave is correct and that it is a 300R resistor.
Cheers
Brian

Mr Moose · 29th Aug 2009, 11:22 am

Hello,
Deja vu? There's a similar discussion on this American forum.
http://www.antiqueradios.com/forums/...4fa05301dc5cee
From which it would appear that just to confuse everybody Micamold made resistors and paper caps as well as mica ones.
Yours, Richard

Geoff 555 · 29th Aug 2009, 1:01 pm

Hi back again, I have managed to find what I was looking for because having a mind like a computer I had lost it. IT is
www.angelfire.com/electronic/funwithtubes/
If you wade through it to 'HOW TO' just below the heading is 'reading component color and numerical codes etc. ( or something close to that!) which explains the coloured 'dot' system. Might be useful.
Cheers.
Geoff.

Pete_kaye · 1st Sep 2009, 2:31 pm

Interesting....however i should have said it is brown not black and goes off the scale when connected to the 2Meg range and then has small voltages droping rapidly on a DMM.So not 300R!There were 300PF caps in the circuit which is what the dots say.I just don't know what a type 802 resistor is .Can a resistor fail and exhibit Cap properties.

Barry Lloyd · 2nd Sep 2009, 9:31 pm

I looked up the patent number on this components (see http://v3.espacenet.com/publicationD...C&locale=en_gb ). It is for a grid leak resistor. Clearly, 300 ohm is much too low for this function.
Could the brown be a faded green and actually it is a 3 meg resistor? Or maybe it's just open-circuit?

Barry

28th Aug 2009, 5:10 pm	#1
Pete_kaye Octode Join Date: Jun 2005 Location: Sheffield, South Yorkshire, UK. Posts: 1,227	Is it a cap ? this came from a junk box and seems to behave like a capacitor but it says 'Type 802 resistor'on the front.Here are 2 photos... Attached Thumbnails Last edited by Pete_kaye; 28th Aug 2009 at 5:26 pm.

28th Aug 2009, 5:37 pm	#2
Colin Heptode Join Date: Jun 2004 Location: Ilkley, West Yorkshire, UK. Posts: 656	Re: Is it a cap ? I believe Micamold made both caps and resistors in the same brown molded shape. Your example has 'resistor' on the side so I guess it's a resistor (that looks like a cap). __________________ Colin Armstrong

28th Aug 2009, 10:45 pm	#3
Geoff 555 Heptode Join Date: Jan 2008 Location: Bristol, UK. Posts: 981	Re: Is it a cap ? Hello, how interesting I have some capacitors with the same 'arrow' and paint 'dots' also Micamold, the radio is American and dated 1953. Cheers. Geoff.

29th Aug 2009, 1:23 am	#4
Darren-UK Retired Dormant Member Join Date: Apr 2003 Location: Blackpool, Lancashire, UK. Posts: 4,061	Re: Is it a cap ? The arrow, for a brief moment, made me think it was a diode - then I saw the coloured dots and read Colin's post. Reading Geoff's post, does it mean that same arrow appeared on the moulding regardless of what the component actually is? The above aside, would I be correct in assuming the arrow (when on a resistor) serves to indicate the sequence of reading the colour codes?

29th Aug 2009, 9:57 am	#5
Radio_Dave Nonode Join Date: Jun 2004 Location: Norwich, Norfolk, UK. Posts: 2,543	Re: Is it a cap ? Hi Pete, What colour is it? It was my understanding that resistors of this type were coloured black and capacitors brown. Anyhow, yes it is a resistor. The arrow indicates the direction in which the dots should be read (in capacitors too), so it's orange (I think), black, brown = 300R David

29th Aug 2009, 10:17 am	#6
brianc Rest in Peace Join Date: Jun 2004 Location: Burghfield, Reading, Berkshire, UK, Posts: 1,055	Re: Is it a cap ? If it's a cap (unlikely) it will be a mica cap (micamould!!) and therefore would be very unlikely to leak. Have you measured it! I bet Dave is correct and that it is a 300R resistor. Cheers Brian

29th Aug 2009, 11:22 am	#7
Mr Moose Octode Join Date: Jul 2008 Location: Gloucestershire, UK. Posts: 1,043	Re: Is it a cap ? Hello, Deja vu? There's a similar discussion on this American forum. http://www.antiqueradios.com/forums/...4fa05301dc5cee From which it would appear that just to confuse everybody Micamold made resistors and paper caps as well as mica ones. Yours, Richard

29th Aug 2009, 1:01 pm	#8
Geoff 555 Heptode Join Date: Jan 2008 Location: Bristol, UK. Posts: 981	Re: Is it a cap ? Hi back again, I have managed to find what I was looking for because having a mind like a computer I had lost it. IT is www.angelfire.com/electronic/funwithtubes/ If you wade through it to 'HOW TO' just below the heading is 'reading component color and numerical codes etc. ( or something close to that!) which explains the coloured 'dot' system. Might be useful. Cheers. Geoff.

1st Sep 2009, 2:31 pm	#9
Pete_kaye Octode Join Date: Jun 2005 Location: Sheffield, South Yorkshire, UK. Posts: 1,227	Re: Is it a cap ? Interesting....however i should have said it is brown not black and goes off the scale when connected to the 2Meg range and then has small voltages droping rapidly on a DMM.So not 300R!There were 300PF caps in the circuit which is what the dots say.I just don't know what a type 802 resistor is .Can a resistor fail and exhibit Cap properties.

2nd Sep 2009, 9:31 pm	#10
Barry Lloyd Retired Dormant Member Join Date: May 2006 Location: London, UK. Posts: 129	Re: Is it a cap ? I looked up the patent number on this components (see http://v3.espacenet.com/publicationD...C&locale=en_gb ). It is for a grid leak resistor. Clearly, 300 ohm is much too low for this function. Could the brown be a faded green and actually it is a 3 meg resistor? Or maybe it's just open-circuit? Barry