Pye 18A, what type of resisistor is this? - UK Vintage Radio Repair and Restoration Discussion Forum

BrianAllen · 14th May 2020, 7:02 pm

All I know as per the data sheet for my Pye !8 A is that this is a 3000 ohm H.T. Smoothing Capacitor.

What type of resistor is this and what type of resistor can I replace it with as I have searched high and low for something similar in shape and size.

Thank you.

McMurdo · 14th May 2020, 7:06 pm

looks like a wirewound vitreous enamel jobbie. Do you know the wattage (should be in the service sheet)

(PS it's 8W)

Farnell do one here

https://uk.farnell.com/neohm-te-conn...ide/dp/3230216

You could get a more authentic looking one from mouser:

https://www.mouser.co.uk/ProductDeta...SzIgUxQ0NKw%3D

Heatercathodeshort · 14th May 2020, 7:11 pm

Is it actually O/C? probably 10 watt by its size. More important to change are those incontinent waxies below your 8uf cap. J.

BrianAllen · 14th May 2020, 7:20 pm

Thanks Kevin, it didn't state the wattage on my sheet.

The waxies are on their way out; have replaced most of them now apart from one than has gone missing (C23 according to data sheet)!!

Thanks J just checked again with meter and now have a reading of 3.080; another lesson learnt, check and check again!!

BrianAllen · 14th May 2020, 7:21 pm

Where did you find the wattage Kevin?

turretslug · 14th May 2020, 7:34 pm

These vitreous enamelled resistors are usually pretty much indestructible if not mechanically abused, the fine wire in high-value types can eventually go open-circuit after decades occasionally but otherwise they'll be soldiering on when everything else around them has gone to the pearly gates! Their toughness does mean that they have a good power rating for their size, but it also means that they are often run searingly hot and need to be positioned clear of insulated wire and other components.

crackle · 14th May 2020, 7:39 pm

Also be aware that if you remove the resistor and then refit it, if the wires are short the solder making the new connections may melt.

Mike

BrianAllen · 14th May 2020, 7:55 pm

Thanks Mike, I will take note of that information.

Brian

Graham G3ZVT · 15th May 2020, 9:22 am

Quote:

Originally Posted by crackle

Also be aware that if you remove the resistor and then refit it, if the wires are short the solder making the new connections may melt.

Mike

Perhaps there is a use for lead-free solder after all

Herald1360 · 15th May 2020, 10:37 am

Or indeed the "opposite".......

https://www.somersetsolders.com/high...lder-wire/p232

14th May 2020, 7:02 pm	#1
BrianAllen Heptode Join Date: Nov 2018 Location: Staffordshire Moorlands, UK. Posts: 595	Pye 18A, what type of resisistor is this? All I know as per the data sheet for my Pye !8 A is that this is a 3000 ohm H.T. Smoothing Capacitor. What type of resistor is this and what type of resistor can I replace it with as I have searched high and low for something similar in shape and size. Thank you. Attached Thumbnails

14th May 2020, 7:06 pm	#2
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,271	Re: What type of resisistor is this? looks like a wirewound vitreous enamel jobbie. Do you know the wattage (should be in the service sheet) (PS it's 8W) Farnell do one here https://uk.farnell.com/neohm-te-conn...ide/dp/3230216 You could get a more authentic looking one from mouser: https://www.mouser.co.uk/ProductDeta...SzIgUxQ0NKw%3D __________________ Kevin Last edited by McMurdo; 14th May 2020 at 7:17 pm. Reason: added links

14th May 2020, 7:11 pm	#3
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: What type of resisistor is this? Is it actually O/C? probably 10 watt by its size. More important to change are those incontinent waxies below your 8uf cap. J.

14th May 2020, 7:20 pm	#4
BrianAllen Heptode Join Date: Nov 2018 Location: Staffordshire Moorlands, UK. Posts: 595	Re: What type of resisistor is this? Thanks Kevin, it didn't state the wattage on my sheet. The waxies are on their way out; have replaced most of them now apart from one than has gone missing (C23 according to data sheet)!! Thanks J just checked again with meter and now have a reading of 3.080; another lesson learnt, check and check again!!

14th May 2020, 7:21 pm	#5
BrianAllen Heptode Join Date: Nov 2018 Location: Staffordshire Moorlands, UK. Posts: 595	Re: What type of resisistor is this? Where did you find the wattage Kevin?

14th May 2020, 7:34 pm	#6
turretslug Dekatron Join Date: Nov 2011 Location: Surrey, UK. Posts: 4,395	Re: What type of resisistor is this? These vitreous enamelled resistors are usually pretty much indestructible if not mechanically abused, the fine wire in high-value types can eventually go open-circuit after decades occasionally but otherwise they'll be soldiering on when everything else around them has gone to the pearly gates! Their toughness does mean that they have a good power rating for their size, but it also means that they are often run searingly hot and need to be positioned clear of insulated wire and other components.

14th May 2020, 7:39 pm	#7
crackle Rest in Peace Join Date: Mar 2011 Location: Basildon, Essex, UK. Posts: 4,100	Re: What type of resisistor is this? Also be aware that if you remove the resistor and then refit it, if the wires are short the solder making the new connections may melt. Mike

14th May 2020, 7:55 pm	#8
BrianAllen Heptode Join Date: Nov 2018 Location: Staffordshire Moorlands, UK. Posts: 595	Re: What type of resisistor is this? Thanks Mike, I will take note of that information. Brian

15th May 2020, 10:37 am	#10
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,535	Re: Pye 18A, what type of resisistor is this? Or indeed the "opposite"....... https://www.somersetsolders.com/high...lder-wire/p232 __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O