Broken sub amp

RiverGmblr · 28th October 2005, 07:00 AM

I have an Apex Senior sub amp that doesn't work and would like to try and fix it. Can anybody help me out? I don't think I can do anymore damage that has been done. (I have checked the fuse and made sure it was plugged in). TIA Tom

silentblackhat · 29th October 2005, 05:21 AM

idk much about amps but might try to take a volt meter and test voltage around the board?

anatech · 30th October 2005, 03:55 PM

Hi Tom,
You can do more damage. It is possible to change it from cheap to fix to expensive to fix. Or from repairable to unrepairable. Please proceed with help.

You may want to have this move to the solid state forum for a better response.

So, is the fuse open or okay? If it's open, is it blown with a big silver or black mark, or just a little "puff" on the glass. Looking at the unit, are there any obviously burned area's or parts? Can you post a picture?

-Chris

RiverGmblr · 30th October 2005, 04:05 PM

No takers ? Well anyway here's what it does. The amp turns on, the green light comes on when given a signal but no out put to the speaker. I have tried different A/V recievers to power it so I know it's the plate amp. I tried poking around with volt meter but I didn't find anything dead. I could realy use some help here . I'd hate to trash the amp. TKS Tom

anatech · 30th October 2005, 04:28 PM

Hi Tom,

Quote:

No takers ? Well anyway here's what it does. The amp turns on, the green light comes on when given a signal but no out put to the speaker.

Did you read my post? I don't have the diagram, but I am attempting to help.

The light is on, therefore the fuse is good. Are you using the speaker inputs or the RCA input jacK? Have you checked the volume control position?

Sorry if the questions are basic, but I don't know what you've done so far.

-Chris

Netlist · 30th October 2005, 04:52 PM

Takers?
Sure. Here you go with the schematic kindly provided by Steve at http://www.apexjr.com/Apexsenior.htm
On the power supply/output schematic you can see two bridge rectifiers: B01 and B02. They provide the main voltages for the amp.
If your outputs transistors were shorted, you'd probably have a blown mains fuse so I recommand to measure if you have + and - 15V at the indicated points first.

/Hugo

VT67 · 30th October 2005, 05:01 PM

Quote:

Here you go with the schematic kindly provided by Steve at http://www.apexjr.com/Apexsenior.htm

Dam'n! Wish I had so much luck with my Thommessen plate amp. They didn't even reply on my email. I got it going again but there's still something wrong with it and I can't figure out what it is.
Needed to get that of my chest

Cheers

anatech · 30th October 2005, 05:35 PM

Hi GeWa,
Didn't see your post. Want to try in Solid State?

-Chris

VT67 · 30th October 2005, 07:25 PM

anatech,

Almost a year ago I made an attempt to start a thread regarding my plate amp.
Thommessen plate amp

As you can see I wasn't as fortuned as the guy who started this one.

Cheers

RiverGmblr · 31st October 2005, 12:23 AM

Thanks for the replies. I'm using RCA (line level) in. I turned the in put level up all the way and no sound. By the way I don't mind the obvious questions: I might have missed something. Tom

28th October 2005, 07:00 AM	#1
RiverGmblr diyAudio Member Join Date: Jul 2005 Location: southern california	Broken sub amp I have an Apex Senior sub amp that doesn't work and would like to try and fix it. Can anybody help me out? I don't think I can do anymore damage that has been done. (I have checked the fuse and made sure it was plugged in). TIA Tom

30th October 2005, 07:25 PM	#9
VT67 diyAudio Member Join Date: Jun 2004 Location: Belgium	anatech, Almost a year ago I made an attempt to start a thread regarding my plate amp. Thommessen plate amp As you can see I wasn't as fortuned as the guy who started this one. Cheers __________________ VBITNGC Krell KSA-50 Krell KSA-100MkII

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29th October 2005, 05:21 AM	#2
silentblackhat diyAudio Member Join Date: Jul 2004 Location: kansas	idk much about amps but might try to take a volt meter and test voltage around the board?

30th October 2005, 03:55 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Tom, You can do more damage. It is possible to change it from cheap to fix to expensive to fix. Or from repairable to unrepairable. Please proceed with help. You may want to have this move to the solid state forum for a better response. So, is the fuse open or okay? If it's open, is it blown with a big silver or black mark, or just a little "puff" on the glass. Looking at the unit, are there any obviously burned area's or parts? Can you post a picture? -Chris

30th October 2005, 04:05 PM	#4
RiverGmblr diyAudio Member Join Date: Jul 2005 Location: southern california	No takers ? Well anyway here's what it does. The amp turns on, the green light comes on when given a signal but no out put to the speaker. I have tried different A/V recievers to power it so I know it's the plate amp. I tried poking around with volt meter but I didn't find anything dead. I could realy use some help here . I'd hate to trash the amp. TKS Tom

30th October 2005, 04:52 PM	#6
Netlist diyAudio Moderator Join Date: Jan 2003	Takers? Sure. Here you go with the schematic kindly provided by Steve at http://www.apexjr.com/Apexsenior.htm On the power supply/output schematic you can see two bridge rectifiers: B01 and B02. They provide the main voltages for the amp. If your outputs transistors were shorted, you'd probably have a blown mains fuse so I recommand to measure if you have + and - 15V at the indicated points first. /Hugo

30th October 2005, 05:35 PM	#8
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi GeWa, Didn't see your post. Want to try in Solid State? -Chris

31st October 2005, 12:23 AM	#10
RiverGmblr diyAudio Member Join Date: Jul 2005 Location: southern california	Thanks for the replies. I'm using RCA (line level) in. I turned the in put level up all the way and no sound. By the way I don't mind the obvious questions: I might have missed something. Tom

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