Resistor for a TMK 500TU-B - UK Vintage Radio Repair and Restoration Discussion Forum

Yorch72 · 17th Mar 2023, 8:42 pm

My dear friends,
I have a TMK 500TU-B multimeter. One resistor is burnt, is a 34 Ohm resistor.
As you can see it has been changed in the past but I can not "read" the colours, and probably is burnt because it was the wrong resistor.
What kind of modern ones do you recommend? I think that the tolerance is 1%.
There is a lot of info here about the TMK 500 multimeter but nothing about the 500TU-B one. Diagrams are very different!
Thank you in advance!!

Cobaltblue · 17th Mar 2023, 9:03 pm

The value is written on the board on these is that not still readable?

Have you seen this video?

https://www.youtube.com/watch?v=Cn8-fxWBcAo

Cheers

Mike T

Restoration73 · 17th Mar 2023, 9:10 pm

This is the taut band version;

See #31 ;
https://vintage-radio.net/forum/showthread.php?p=934350

You could use a 0.5W metal film resistor - 33 ohm in series with 1 ohm

Yorch72 · 18th Mar 2023, 10:05 am

Quote:

Originally Posted by Cobaltblue

The value is written on the board on these is that not still readable?

Have you seen this video?

https://www.youtube.com/watch?v=Cn8-fxWBcAo

Cheers

Mike T

Yes, Mike! That is the video where I found the value. As you can see in mine you can not read it. Thank you!

Yorch72 · 18th Mar 2023, 10:08 am

Quote:

Originally Posted by Restoration73

This is the taut band version;

See #31 ;
https://vintage-radio.net/forum/showthread.php?p=934350

You could use a 0.5W metal film resistor - 33 ohm in series with 1 ohm

Thank you!
So 500TU has the same diagram as 500TU-B
I will keep that diagram then.

Silicon · 21st Mar 2023, 7:40 pm

Some of the end caps of those green resistors seem to be touching.

The insulation (paint) may break down at high voltages.

17th Mar 2023, 8:42 pm	#1
Yorch72 Diode Join Date: Mar 2023 Location: Deeping St James, Lincolnshire, UK. Posts: 3	Resistor for a TMK 500TU-B My dear friends, I have a TMK 500TU-B multimeter. One resistor is burnt, is a 34 Ohm resistor. As you can see it has been changed in the past but I can not "read" the colours, and probably is burnt because it was the wrong resistor. What kind of modern ones do you recommend? I think that the tolerance is 1%. There is a lot of info here about the TMK 500 multimeter but nothing about the 500TU-B one. Diagrams are very different! Thank you in advance!! Attached Thumbnails

17th Mar 2023, 9:03 pm	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter, Devon and Poole, Dorset UK. Posts: 6,874	Re: Resistor for a TMK 500TU-B The value is written on the board on these is that not still readable? Have you seen this video? https://www.youtube.com/watch?v=Cn8-fxWBcAo Cheers Mike T __________________ Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk

21st Mar 2023, 7:40 pm	#6
Silicon Nonode Join Date: Jun 2007 Location: Coulsdon, London, UK. Posts: 2,167	Re: Resistor for a TMK 500TU-B Some of the end caps of those green resistors seem to be touching. The insulation (paint) may break down at high voltages.

17th Mar 2023, 9:10 pm	#3
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Resistor for a TMK 500TU-B This is the taut band version; See #31 ; https://vintage-radio.net/forum/showthread.php?p=934350 You could use a 0.5W metal film resistor - 33 ohm in series with 1 ohm __________________ Home, home again - I like to be here when I can