No Sound in Bass amp

lowell · 10th November 2007, 10:06 PM

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

Ole_Otter · 11th November 2007, 08:50 AM

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

lowell · 11th November 2007, 11:41 AM

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

Ole_Otter · 12th November 2007, 06:41 AM

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

lowell · 12th November 2007, 07:44 AM

Ok right on... thanks!

sreten · 12th November 2007, 03:49 PM

model number ?

/sreten.

10th November 2007, 10:06 PM	#1
lowell diyAudio Member Join Date: Nov 2007	No Sound in Bass amp 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

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11th November 2007, 08:50 AM	#2
Ole_Otter diyAudio Member Join Date: Nov 2007	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

11th November 2007, 11:41 AM	#3
lowell diyAudio Member Join Date: Nov 2007	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

12th November 2007, 06:41 AM	#4
Ole_Otter diyAudio Member Join Date: Nov 2007	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

12th November 2007, 07:44 AM	#5
lowell diyAudio Member Join Date: Nov 2007	Ok right on... thanks!

12th November 2007, 03:49 PM	#6
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	model number ? /sreten.

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