Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: AllanMarcus on April 02, 2018, 04:07:04 PM

Title: I think I screwed-up, but not too bad (need advice)...
Post by: AllanMarcus on April 02, 2018, 04:07:04 PM

I may have made a mistake. I soldered a MJE5731A transistor in the wrong way. I saw it and kicked myself. Then I tried to de-solder it, and eventually got it out and turned around. Now I'm worried about how much heat I had to apply to get it out. Because it has three non-flexible posts, I had to heat all three at the same time for a long time to melt all the solder (even after using a solder sucker and a solder wick).

So, my question concerns the heat these transistors can take. I realize you can't tell too much from picture (see below), but ug. I had to heat this thing to like 600 degrees to get all three posts out at the same time.

https://cdn.head-fi.org/g/9937485_l.jpg (https://cdn.head-fi.org/g/9937485_l.jpg)

Should I just cut my losses, clip the leads, de-solder, and install a new one? Or will it be OK? Looks like Mouser has them for $1.07 (+$5 shipping).
https://www.mouser.com/ProductDetail/ON-Semiconductor/MJE5731AG

Title: Re: I think I screwed-up, but not too bad (need advice)...
Post by: Paul Birkeland on April 03, 2018, 03:59:57 AM

I wouldn't remove it.  It takes both heat and time to kill these transistors, and if the PC board isn't burned, the transistor is almost certainly OK.

Title: Re: I think I screwed-up, but not too bad (need advice)...
Post by: AllanMarcus on April 03, 2018, 05:20:31 AM

Quote from: Caucasian Blackplate on April 03, 2018, 03:59:57 AM

I wouldn't remove it.  It takes both heat and time to kill these transistors, and if the PC board isn't burned, the transistor is almost certainly OK.

Great! Thanks.