hello,
i'm used to working on tube amps, but have a Gallien-Krueger bass amp that is only providing sound through the tweeter and nothing through the "woofers". I have no idea where to start with this circuit... i did however check the speakers and they are fine... I've yet to try using an audio probe, that's how I usually fix effect pedals. Any help on order of troubleshooting events would be very welcome!! Thanks ahead of time.
Lowell
i'm used to working on tube amps, but have a Gallien-Krueger bass amp that is only providing sound through the tweeter and nothing through the "woofers". I have no idea where to start with this circuit... i did however check the speakers and they are fine... I've yet to try using an audio probe, that's how I usually fix effect pedals. Any help on order of troubleshooting events would be very welcome!! Thanks ahead of time.
Lowell
Hey Lowell,
Well, I have repaired a couple GK amps but it was tough. Bob Gallien has gone out of his way to design amps that almost no one can fix OR understand. If it has no protection relay, it will have some kind of funky solid state device(s) that will shut it down. If you have no schematic, you are absolutely on your own. When GK amps failed at the shop I worked in, we highly encouraged owners to swollow deeply and buy a different product. Most of the time, we sent the amps back to GK and we didn't fool with them. Problem is, GK takes literally, months to service amps, unless you are lucky..... WOW, I feel for ya brother. Sorry for the "doom and gloom" post, but I know the woes of repairing, or not, GK amps. Best of luck to ya!!!
Otter
Well, I have repaired a couple GK amps but it was tough. Bob Gallien has gone out of his way to design amps that almost no one can fix OR understand. If it has no protection relay, it will have some kind of funky solid state device(s) that will shut it down. If you have no schematic, you are absolutely on your own. When GK amps failed at the shop I worked in, we highly encouraged owners to swollow deeply and buy a different product. Most of the time, we sent the amps back to GK and we didn't fool with them. Problem is, GK takes literally, months to service amps, unless you are lucky..... WOW, I feel for ya brother. Sorry for the "doom and gloom" post, but I know the woes of repairing, or not, GK amps. Best of luck to ya!!!
Otter
Otter,
Hey thank you for the heads up... better to hear from someone about this ahead of time before I get elbow deep into something I probably won't be able to fix. I am however very curious as to what's so different about GK amps so I might do some research just so I'm more comfortable with what to tell customers.
Thanks again,
Lowell
Hey thank you for the heads up... better to hear from someone about this ahead of time before I get elbow deep into something I probably won't be able to fix. I am however very curious as to what's so different about GK amps so I might do some research just so I'm more comfortable with what to tell customers.
Thanks again,
Lowell
Hey Lowell,
If you ever get a few schematics, you will see how Bob does things. I no longer work in that shop, so I don't have any access to the prints. If I did, I'd send ya one. He just does things very unconventionally and adds parts where there need not be parts. The protection circuits are weird as well, with lots of extra parts. I don't say not to try fixing the amp but like you say "elbow deep" As you know, parts are pretty expensive these days. Good luck!
Otter
If you ever get a few schematics, you will see how Bob does things. I no longer work in that shop, so I don't have any access to the prints. If I did, I'd send ya one. He just does things very unconventionally and adds parts where there need not be parts. The protection circuits are weird as well, with lots of extra parts. I don't say not to try fixing the amp but like you say "elbow deep" As you know, parts are pretty expensive these days. Good luck!
Otter
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