|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
I had 4 out of 30 brand new cathode load resistors fail. They are well under the limits for dissipation and voltage. They were 180K @ 2W purchased from Mouser. Three opened and one doubled in value.Now here's the rub: The four that failed were soldered in a large solder pot on a PC board. A water based flux was used and washed off with tap water. Then after some touchups, the board was soaked in Isopropal alcohol for 10 nminutes and dried with compressed air. I have been using the technique on PC boards for over 20 years without incident.
The other 24 resistors were point to point wired and all are within tolerance.
Too much heat? Did the water or alcohol get ito the resistor body somehow.
Any ideas or similar expereinces? This has me stumped.
This post is made possible by the generous support of people like you and our sponsors:
Topic - Metal Film Failures? - Gusser 11:07:58 08/11/06 (9)
- Learned a lot from this thread, thanks everyone (nt) - Ray Moth 04:28:22 08/13/06 (0)
- I had a similar problem.. - DaveInVA 09:21:21 08/12/06 (0)
- Re: Metal Film Failures? - sorenj07 19:06:00 08/11/06 (0)
- Re: Metal Film Failures? - Jim McShane 14:29:52 08/11/06 (2)
- In This: - Gusser 15:15:50 08/11/06 (1)
- Re: In This: - Jim McShane 10:49:04 08/12/06 (0)
- You have to be careful with MF resistors - Mike Burrows 13:14:03 08/11/06 (2)
- Re: You have to be careful with MF resistors - MIchael Samra 17:57:06 08/13/06 (1)
- The ones I bought were lemons - Mike Burrows 04:39:23 08/14/06 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
