hot reisistors in fender switching supply

[Andy Le Blanc]

I've got a fender blues deluxe reissue on the bench.

came in with the lights on and nobody home, appears to be the relay PS
a bad solder join around a 5w after the rectifier, the appears to operate fine.

But the 5w are HOT, ????. I don't use switching, too much of the old fart in me.
most players I know don't bother, one more thing to frig up.

Are the 5w power resistors, in the relay switching PS, in a blues deluxe reissue typically hot?

[Randy Magee]

This has been one of the main problems in the Hot Rod series of amps as well and the Blues Deluxe shares the same circuit in channel switching with the Hot Rod series. Sometimes these resistors will get so hot that they unsolder themselves from the board and upon cooling form a cold solder joint. I've started mounting 10 watt resistors on a separate board to remedy that problem. It's sad... not a bad sounding amp... just such a flimsy circuit board!

[Andy Le Blanc]

Thanks for the reply... don't figure, does it. Another fender issue.
10w crossed my mind too, and cooling fins.

[Randy Magee]

I've seen the traces burned off the board by those resistors... I just mounted the 10 watts on a separate board and ran flying leads back to the circuit board and none of those amps have had further issues. YMMV

[billyz]

I usually just mount a pair up off the board with some hot melt glue for support. Some guys are substituting 330 ohm. But I don't , they just get too hot next to the board and unsolder themselves, and cook the board.

Also the wave solder is not too heavy either. So a good resolder is a quick and reliable fix.