Broken Thermistor in Philips N3G25T Car Radio - UK Vintage Radio Repair and Restoration Discussion Forum

Potless · 4th Jun 2019, 2:23 pm

I am currently repairing this radio for a friend who has an old Ford Consul (lucky man!).

I have fixed the original fault, which was no results on either LW or MW (it was down to an internal "whisker" short on one of the AF117 transistors, TR2).

However, before I can hand it back, there is another problem - the VDR designated R26 is split in two. There are no markings on it, and no type number is given in the circuit diagram (see photo).

Would anyone happen to know of a suitable replacement? Thanks in advance!

AC/HL · 4th Jun 2019, 6:18 pm

It's a thermistor not a VDR. The manual just says 130 ohm Varite. Not easy to find nowadays, good hunting.

ms660 · 4th Jun 2019, 6:54 pm

VA1040 specified as 130 ohms at 25 degrees C if you can find one:

http://www.electrojumble.org/DATA/Mu...o%20VA1040.pdf

VA1096 specified as 150 ohms but has a lower power rating:

http://www.electrojumble.org/DATA/Mu...rom_VA1053.pdf

Lawrence.

Potless · 5th Jun 2019, 2:40 pm

OK, thanks for the information, I'll see what's available!

4th Jun 2019, 2:23 pm	#1
Potless Tetrode Join Date: Feb 2014 Location: Norwich, Norfolk, UK. Posts: 53	Broken Thermistor in Philips N3G25T Car Radio I am currently repairing this radio for a friend who has an old Ford Consul (lucky man!). I have fixed the original fault, which was no results on either LW or MW (it was down to an internal "whisker" short on one of the AF117 transistors, TR2). However, before I can hand it back, there is another problem - the VDR designated R26 is split in two. There are no markings on it, and no type number is given in the circuit diagram (see photo). Would anyone happen to know of a suitable replacement? Thanks in advance! Attached Thumbnails Last edited by Potless; 4th Jun 2019 at 2:45 pm.

4th Jun 2019, 6:18 pm	#2
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Broken VDR in Philips N3G25T Car Radio It's a thermistor not a VDR. The manual just says 130 ohm Varite. Not easy to find nowadays, good hunting.

4th Jun 2019, 6:54 pm	#3
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Broken VDR in Philips N3G25T Car Radio VA1040 specified as 130 ohms at 25 degrees C if you can find one: http://www.electrojumble.org/DATA/Mu...o%20VA1040.pdf VA1096 specified as 150 ohms but has a lower power rating: http://www.electrojumble.org/DATA/Mu...rom_VA1053.pdf Lawrence.

5th Jun 2019, 2:40 pm	#4
Potless Tetrode Join Date: Feb 2014 Location: Norwich, Norfolk, UK. Posts: 53	Re: Broken Thermistor in Philips N3G25T Car Radio OK, thanks for the information, I'll see what's available!