Are these old amps worth fixing?

[Dr Zeus]

I found a very old car-audio shop here in Atlanta who had some ancient classics. They sold them to me for dirt cheap and are worth the cost I paid probably for the outer cases alone.

I have yet to break these apart and play Where's Waldo, and will set up individual threads if I need a bit of help.

Are these any good for repair?
1 x Rockford Fosgate Punch 40 DSM that turns on and doesnt play anything
2 x Rockford Fosgate Punch 60 DSM. Both only work over one channel.
1 x MTX 4320 amp that doesnt turn on - probably has a lot of blown circuits.

Which would be the most enjoyable for fixing vs throwing away? The Rockford amps look very nice and clean and are missing end caps but have no scratches. They score a 9.7 out of 10 cosmetically. THe MTX is about an 8 out of 10. The MTX I am told can run an entire car, and the Rockfords are said to be very underrated.

Also coming in next week is my blown Hifonics Gen X Thor amp...

Gotta love the hobby!

[Dr Zeus]

[Dr Zeus]

Looks like I just fixed the Rockford DSM 40. Resoldered most of the points under the board for HB1 and its working fine now.

[warpedhifi]

All the Rockford's would be worth it, the DSM were some of the best amps Rockford had. The little DSM 40, can run a set of 10's or 12's with no problem at all. Look on Ebay and see how much they run on that site, and that should give you a good idea of what they are worth.

[Perry Babin]

To get the DSM amps working properly you'll likely have to replace every 10uF@16v SMD electrolytic cap in each amp. The preamp board behind the RCA jacks is also generally badly damaged by leaking capacitors. They can be repaired but it can be time consuming.

Most of the MTX can be repaired as long as the board isn't damaged. I'd recommend that you avoid the 5 channel amps (similar to the one you have) with the class D amp for the sub channel.

[Dr Zeus]

Good word.

Heres a pic of the 40 DSM on its back after repair. This amp works just fine after carefully resoldering the pre-amp board under the main PCB near the RCAs.

[Perry Babin]

This is the style amp that needs the electrolytics replaced. The problems are not apparent unless you're looking for them. The 60x2 (the other thread you started) doesn't have as many problems with the capacitors.

[nac134]

I had one of those MTX amps, and it rocked. It was ballsy and clean. I would be willing to put a few hours in.

[Dr Zeus]

I thought that MTX would be pretty good. It says its rated for 30x4 RMS, but its fused with 70A worth of fuses. The shop said this amp was very underrated and likely has about ~300 watts RMS.

[ppia600]

Those are all decent amps IMO. I'd replace the preamp caps like Perry mentioned. They won't be expensive and it will save you a ton of headache down the road. If they aren't leaking yet, do it asap.