HELP!!! Issues with Setup

[JLT]

What up LGM Fam? I need some help with this, please read.

This past Sunday I had some issues with my setup and the culprit was attributable to one or a combination of the following: my amp (Princeton 65 Solid State), Multi FX (Boss ME-25) or Cord’s (3 Monster Cables). I do not believe it’s my guitar (lefty Fender MIM) seeing that it just received a setup a little over a month ago.
So basically I’m playing my guitar through the Multi FX unit through the front of the amp in channel 1, after a while I notice that every so often when I strum there was no sound coming out. So I switched to channel 2, I noticed a little more kick but then it’s happening again, I ran the multi FX unit through the loop with the guitar in the input and eventually again it happened, lastly I just tried running the guitar through the amp by itself and the amp would go in and out as I played (could that have been due me changing from the loop?).
I really think it’s my amp. I’ve had this amp for maybe 7-8 years and it’s been my primary amp most of this time. But I’ve never really began to try and push it until the last couple of years. The reverb when turned past 1 for an extended period of time makes an extremely harsh noise and has done so for the last 4 years. Right now I am still figuring out what I like/want/need in an amp and would like to hold off on purchasing another until I accomplished some milestones. All in all I would like to get you guys input as to what you think may be the source, especially the techies out there.
Appreciate it.

[funkStrat_97]

Wow.  I'm afraid it is the amp.  The old non-DSP Princetons are really nice solid state combos too.  One possible explanation is that you have a couple of cold solder connections in your amp.  Well hey...now you can go out and ge that Egnater Rebel 30 that you've always wanted  .

[gtrdave]

Sounds like the amp to me, too, but I wouldn't know for sure unless I checked everything out personally.
Still, if you eliminate components one by one you should be able to tell where the problem is.
Have you tried your guitar into another amp?
If you plug it into another amp and you still have the problem, it's the guitar.

[JLT]

Thanks for the feedback thus far guys... I plan to get to it today and zero in on the issue. But if it is in fact the amp, is it worth repairing or is it a lost cause? Eventually I plan to buy a good tube amp (maybe even the Rebel 30 ) and use my current amp as a practice amp. I'd like to hold off on a major amp purchase if possible for a few months.

[gtrdave]

It depends on the problem and the shop whether or not it's worth fixing.
Sometimes audio drop-outs are caused by dirty or oxidized jacks or pots. A quick spray of DeOxIt can cure many electronic ills like that.
If it's something deeper, like bad solder joints or a thermal component breakdown, either gets both labor and time intensive and the repair cost may be more than it would cost to go buy a similar used amp that works well.