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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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11th Nov 2017, 1:49 pm | #1 |
Heptode
Join Date: Apr 2003
Location: Ayr, Ayrshire, UK.
Posts: 630
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Flat 4.7k Resistor
Does anybody recognise this resistor type ?
I got a number of these in a 'mixed bag' a long time ago but would be interested to know their specification. Cheers, Andy |
11th Nov 2017, 2:05 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,549
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Re: Flat 4.7k Resistor
They were a higher power for vertical mounting for better air circulation.
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11th Nov 2017, 5:34 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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Re: Flat 4.7k Resistor
High power, yes - but also low series-inductance..
Similar-looking 'flat' resistors were used in the Pye A200 linear-amplifier's input matching/attenuation network. |
11th Nov 2017, 6:22 pm | #4 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Flat 4.7k Resistor
I'm sure they were used in some TV's, Thorn TVs maybe?
Lawrence. |
11th Nov 2017, 9:43 pm | #5 |
Rest in Peace
Join Date: May 2003
Location: Harlaxton, Lincolnshire, UK.
Posts: 3,944
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Re: Flat 4.7k Resistor
Thick film type?
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12th Nov 2017, 9:32 am | #6 |
Heptode
Join Date: Apr 2003
Location: Ayr, Ayrshire, UK.
Posts: 630
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Re: Flat 4.7k Resistor
Thanks for all the reply's. I agree that they would be good for RF and might be thick film types so without further information, I'll just have to guess their power rating - say 1W or so.
I wonder who the manufacturer was ? Unlike capacitors, the makers of resistors tend to be anonymous. Regards, Andy |
12th Nov 2017, 9:44 am | #7 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,802
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Re: Flat 4.7k Resistor
Wait until you try surface-mount parts :-( Capacitors don't even get values marked on them.
You can measure the capacitance, but then you still don't know the material, tempco or voltage. With resistors the size usually gives you the power capability. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
12th Nov 2017, 10:00 am | #8 |
Dekatron
Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 3,315
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Re: Flat 4.7k Resistor
Quad supplied resistors of that type, as plugins, with their 405 power amplifiers to limit the output for use with lower powered speakers. The service manual may give an clue as to who made them.
I remember seeing those resistors and think they were marketed as suitable for close packing of components on a PCB and suitable for machine insertion. |
12th Nov 2017, 4:16 pm | #9 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,061
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Re: Flat 4.7k Resistor
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