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Old 14th Jan 2019, 6:45 pm   #1
Jack_Davis
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Default 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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Old 14th Jan 2019, 7:04 pm   #2
ms660
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Default Re: Need help recognising a vintage resistor

Make, model number?

Lawrence.
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Old 14th Jan 2019, 7:59 pm   #3
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Default 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
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Old 14th Jan 2019, 9:49 pm   #4
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Default 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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Old 14th Jan 2019, 11:36 pm   #5
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Default Re: Need help recognising a vintage resistor

Could it be a Thermistor?

Does its resistance change significantly with temperature?
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Old 15th Jan 2019, 2:34 am   #6
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Default 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.
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Old 15th Jan 2019, 5:47 am   #7
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Default 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.
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Old 15th Jan 2019, 12:22 pm   #8
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Default Re: Need help recognising a vintage resistor

Quote:
Originally Posted by Silicon View Post
Could it be a Thermistor?
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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Old 15th Jan 2019, 12:33 pm   #9
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Default Re: Need help recognising a vintage resistor

Hard to say for sure but it looks like a rect. surge limiter for U series valves.

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Old 15th Jan 2019, 1:17 pm   #10
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Default Re: Need help recognising a vintage resistor

"dog bone " resistor (my thoughts)
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Old 15th Jan 2019, 1:38 pm   #11
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Default Re: Need help recognising a vintage resistor

it's an old carbon resistor probably 4 watt colour code body tip spot.

Mike
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Old 15th Jan 2019, 1:43 pm   #12
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Default 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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Old 15th Jan 2019, 8:27 pm   #13
G8HQP Dave
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Default 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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Old 15th Jan 2019, 8:37 pm   #14
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Default 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.

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Old 30th Jan 2019, 5:51 pm   #15
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Default 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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Old 1st Feb 2019, 12:02 pm   #16
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Default 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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Old 1st Feb 2019, 12:22 pm   #17
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Default Re: Need help recognising a vintage resistor

Quote:
Originally Posted by Jack_Davis View Post
For anyone still wondering it's from a Pamphonic Reproducer type 2 with a Garrard mark 3 deck.
Would that be a Garrard SP25 MK3?

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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Old 1st Feb 2019, 12:55 pm   #18
Malcolm T
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Default 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 ?.
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Old 2nd Feb 2019, 5:13 pm   #19
Jack_Davis
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Default Re: Need help recognising a vintage resistor

These are some pictures of the Record player hope it helps
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Old 2nd Feb 2019, 7:03 pm   #20
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Default 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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