Bose Speaker Amps/radio face

[LancePearson]

The punchlist on my new to me 91 included replacing the rf amp on the rf speaker and replacing the scratched radio face on the Bose Gold radio which has good sound but the rf had a repeating sound which Dr. Don correctly said was a failed amp. His comment was that the components used by Bose included resistors, etc from Malayasia that were doped incorrectly and with the heat and time acid leached out and made them fail. His are doped correctly with lifetime warranty. The parts came early this week and I put the new rf amp in by removing the sill which includes the cover, removing the speaker assembly, unhooking the wires and then indoors removing the back plate and extracting and unhooking the amp that had failed. I had no trouble removing all this and re installing and it works perfectly now. I'll put the new radio face on this weekend when I pull the center console trim to check shift boots and do some minor sound proofing as well though it looks simple enough to do.

Here are some photos of the Bose Gold 1991 cassette/cd am/fm radio and the amp with the rf metal shielding off. On the back side opposite the rf shielding you can see the resistor or whatever it is which failed as the dark spot in the center which has liquid, presumably that acid, around it.

rf speaker in place in 91 vette.jpg

speaker back with amp access.jpg

failed part in the middle of the amp acid based failure.jpg

amp for bose speaker pretty good.jpg

bose amp close up before replacing it.jpg