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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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Old 11th Nov 2017, 1:49 pm   #1
radioman
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Default 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
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Old 11th Nov 2017, 2:05 pm   #2
Refugee
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Default Re: Flat 4.7k Resistor

They were a higher power for vertical mounting for better air circulation.
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Old 11th Nov 2017, 5:34 pm   #3
G6Tanuki
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Default 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.
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Old 11th Nov 2017, 6:22 pm   #4
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Default Re: Flat 4.7k Resistor

I'm sure they were used in some TV's, Thorn TVs maybe?

Lawrence.
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Old 11th Nov 2017, 9:43 pm   #5
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Default Re: Flat 4.7k Resistor

Thick film type?
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Old 12th Nov 2017, 9:32 am   #6
radioman
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Default 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
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Old 12th Nov 2017, 9:44 am   #7
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Default 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.

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Old 12th Nov 2017, 10:00 am   #8
vidjoman
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Default 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.
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Old 12th Nov 2017, 4:16 pm   #9
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Default Re: Flat 4.7k Resistor

Quote:
Originally Posted by radioman View Post
Thanks for all the reply's. I agree that they would be good for RF...
Would also be good as snubber resistors in switch-mode power supplies. Low inductances are vital here too!
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