Transformer repair question

woody · 15th October 2005, 11:11 PM

I just picked up an amp with a sick transformer. I found that the
thermal cutoff hidden under some of the core windings had opened. I can`t read a part #. What would be the most likely
temp rating used in a generic power supply transformer rated
at 70v ct 150va. And lastly I sure would like to buy one without
making a minimum order from Digikey so if some one would just sell me one.....

thanks,

Woody

richie00boy · 15th October 2005, 11:23 PM

90 degrees centigrade
or 115 if you are feeling lucky

xplod1236 · 16th October 2005, 05:31 AM

You can find those at radio shack.

Enzo · 18th October 2005, 12:20 AM

Radio Shack has thermal fuses? That would be VERY surprising.

Jameco also sells them, and MCM, and others.

Don't worry so much about the value. The difference in protection between 90- 100- 110 degrees is not spacious.

xplod1236 · 18th October 2005, 01:25 AM

Quote:

Originally posted by Enzo
Radio Shack has thermal fuses? That would be VERY surprising.

Yes it does. I was surprised too when I needed one and RS had it. Probably not the cheapest, but it's local and probably cheaper than paying shipping.

http://www.radioshack.com/product.as...%5Fid=270-1320

mrlots2do · 18th October 2005, 02:08 AM

Quote:

Originally posted by xplod1236
http://www.radioshack.com/product.as...%5Fid=270-1320

I believe that link is to high of fail rating. It's probably for larger coffee makers or even heater duty (flame roll out use).

This is closer to what you want, probably still a bit high.
http://www.radioshack.com/product.as...%5Fid=270-1322

Enzo · 19th October 2005, 12:09 AM

Wow, I am shocked. I even checked a local store and the system says they have it in stock. Amazing.

15th October 2005, 11:11 PM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Transformer repair question I just picked up an amp with a sick transformer. I found that the thermal cutoff hidden under some of the core windings had opened. I can`t read a part #. What would be the most likely temp rating used in a generic power supply transformer rated at 70v ct 150va. And lastly I sure would like to buy one without making a minimum order from Digikey so if some one would just sell me one..... thanks, Woody

15th October 2005, 11:23 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	90 degrees centigrade or 115 if you are feeling lucky __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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16th October 2005, 05:31 AM	#3
xplod1236 diyAudio Member Join Date: Dec 2003 Location: On the couch	You can find those at radio shack.

18th October 2005, 12:20 AM	#4
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Radio Shack has thermal fuses? That would be VERY surprising. Jameco also sells them, and MCM, and others. Don't worry so much about the value. The difference in protection between 90- 100- 110 degrees is not spacious.

19th October 2005, 12:09 AM	#7
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Wow, I am shocked. I even checked a local store and the system says they have it in stock. Amazing.