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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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14th Jan 2019, 6:45 pm | #1 |
Triode
Join Date: Jan 2019
Location: Bristol, UK.
Posts: 25
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Need help recognising a vintage resistor
I am trying to restore a vintage record player and radio and came across what looks to be a blown resistor however I cannot identify what the value of it is any help would be useful. Any questions just ask
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14th Jan 2019, 7:04 pm | #2 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Need help recognising a vintage resistor
Make, model number?
Lawrence. |
14th Jan 2019, 7:59 pm | #3 |
Dekatron
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Re: Need help recognising a vintage resistor
Hi Jack, some of them went like that after many years service and were still perfectly OK.
The 10K smoothing resistor in the DAC90a was like that. Measure the value and you may find it close (say 10%) of the correct value and OK. Ed |
14th Jan 2019, 9:49 pm | #4 |
Dekatron
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Location: Croydon, Surrey, UK.
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Re: Need help recognising a vintage resistor
I doubt it's 'blown'. The paint tended to flake off these old carbon stick resistors and I have radios with resistors that look just like that but are still well within spec. To be sure, you need to know what its value is supposed to be so the circuit is the first step. Measure the resistor as suggested or alternatively let us know the model number and where the resistor is located.
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14th Jan 2019, 11:36 pm | #5 |
Nonode
Join Date: Jun 2007
Location: Coulsdon, London, UK.
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Re: Need help recognising a vintage resistor
Could it be a Thermistor?
Does its resistance change significantly with temperature? |
15th Jan 2019, 2:34 am | #6 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
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Re: Need help recognising a vintage resistor
That looks like an old resistor that would have been marked body-tip-dot.
It looks like some of the paint is still there. Measure it and have a close look to see if there is enough paint still there to work out what the value should be. |
15th Jan 2019, 5:47 am | #7 |
Banned
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Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
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Re: Need help recognising a vintage resistor
Its either a 33 or a 45 or even a 78 rpm.
Really, give us a clue, what exactly is it out of? Make, Model ? Where in the circuit? It's a resistor that's all we can say without any information. Folk here try wherever possible to help but we are not all ESP subjects. |
15th Jan 2019, 12:22 pm | #8 |
Rest in Peace
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Re: Need help recognising a vintage resistor
I agree with Silicon. The sleeving on the wires looks very much like the high temperature stuff that was used on mains dropper connections in past times, so it probably runs hot. Looks like a thermistor, too, with the remains of the metallising on the ends. Tony.
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15th Jan 2019, 12:33 pm | #9 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Need help recognising a vintage resistor
Hard to say for sure but it looks like a rect. surge limiter for U series valves.
Lawrence. |
15th Jan 2019, 1:17 pm | #10 |
Pentode
Join Date: Mar 2013
Location: Leeds, West Yorkshire, UK.
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Re: Need help recognising a vintage resistor
"dog bone " resistor (my thoughts)
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15th Jan 2019, 1:38 pm | #11 |
Pentode
Join Date: Mar 2007
Location: Croydon, London, UK.
Posts: 111
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Re: Need help recognising a vintage resistor
it's an old carbon resistor probably 4 watt colour code body tip spot.
Mike |
15th Jan 2019, 1:43 pm | #12 |
Moderator
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Re: Need help recognising a vintage resistor
I shall refrain from making an intelligent?? guess and wait for the OP to report back with make and model.
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15th Jan 2019, 8:27 pm | #13 |
Rest in Peace
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Re: Need help recognising a vintage resistor
I am going to guess thermistor, but it could be just an ordinary resistor.
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15th Jan 2019, 8:37 pm | #14 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
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Re: Need help recognising a vintage resistor
I've come across lots of different lengths and thicknesses of rod thermistor, but I don't think I ever saw one that didn't have a round cylindrical body, whereas this component has a flat on it like quite a few old-type BTS resistors- especially larger, higher wattage types.
Returning to the original question (!), the resistor tolerance is unlikely to have been closer than 20% anyway and if in one of the familiar simple record players, it may have been a smoothing resistor and not at all critical. Last edited by turretslug; 15th Jan 2019 at 9:01 pm. |
30th Jan 2019, 5:51 pm | #15 |
Triode
Join Date: Jan 2019
Location: Bristol, UK.
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Re: Need help recognising a vintage resistor
For anyone still wondering it's from a Pamphonic Reproducer type 2 with a Garrard mark 3 deck.
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1st Feb 2019, 12:02 pm | #16 |
Dekatron
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Re: Need help recognising a vintage resistor
Getting there....... where in the circuit of said unit was the resistor? A picture of its location as good as the picture of the resistor itself would help pin it down.
One end being silver suggests a 10% resistor but no help with value. What does it measure? If it's within 10% of a standard E12 value or one of the common values of the period, then it's probably OK electrically.
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1st Feb 2019, 12:22 pm | #17 | |
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Re: Need help recognising a vintage resistor
Quote:
I can't find a reference to a Pamphonic Reproducer type 2. A picture of the whole record player would help, as well as a picture showing the resistor's position in the amplifier. We cannot be expected to identify a component's type and value from the single picture you've submitted.
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1st Feb 2019, 12:55 pm | #18 |
Hexode
Join Date: Dec 2018
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Re: Need help recognising a vintage resistor
Ha, i used to assemble and test those Garrard SP25 MK3 turntables at Thorns in Hainault watching the wow and flutter needles in the test cabin, and listening to the tone test record, yuk, cheap as chips, but not many in the 70s had the dosh for expensive gear like the 401 with an SME arm.
Whats the value of the resistor read then ?. |
2nd Feb 2019, 5:13 pm | #19 |
Triode
Join Date: Jan 2019
Location: Bristol, UK.
Posts: 25
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Re: Need help recognising a vintage resistor
These are some pictures of the Record player hope it helps
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2nd Feb 2019, 7:03 pm | #20 |
Dekatron
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Re: Need help recognising a vintage resistor
Pictures on here suggest that the resistor is not as bad as it appears: https://www.lencoheaven.net/forum/index.php?topic=922.0
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