No problem starting amp but after a couple min of playing it develops a popping noise

It sounds like it is starving for fuel and the popping is likley from being too lean.

Have you tried different speakers? If a speaker has a short, it will draw too much current from the amp and pop the fuse. Also, does the amp pop a fuse on idle, or just under load. What is the gain set for?

Check the sub with a multimeter. It should read the ohms it is rated at when you hook it to the positive & negative inputs. It its off your coil if bad.

Coils do develop thermal issues sometimes - replacing it is a good place to start.

Power steering pump failure Noise}n then ceased (smoke-belt rubbing) therefore no power steering. Replir/replace pump.

First thing is to check that batteries are good. Next, verify your guitar cable is a good one... some are microphonic and the cable can actually insert noise into the signal. The plugs on cables can sometimes be noisy as they move while playing. Try to keep the guitar from "hearing" the amp as it can create feedback. Verify the amp itself isn't the source of the noise. Try a different guitar. The input of the amp is grounded by a contact when cable is removed, If there is a problem right in the input stage it can be masked. Plug only the guitar cable into the amp... Is ti quiet? If so make sure to try the first few suggestions. ALso be aware of other noise producers like fluorescent lights an dimmers... these generate electrical noise that sensitive guitars can pick up.

It is probably a hard to find record electronics problem and possible that the record bias is staying on partially. This will erase partially the audio and apply the clicks. You are going to need a good Technician for this. Try this guy- I have confidence in him.
New Jersey Factory Service, Inc.
16 Chestnut Avenue Suite 103 B
Emerson,New Jersey 07630
201-967-0060
Fax 201-967-0062
Mon- Thurs 8-4 Closed Fri Sat by appt.

just GET A NEW ONE CHEP BASTERED

I have answered some of this before, however I have reveiwed the schematic and as an electrical engineer I want you to do a couple tests.

First, plug in a set of headphones into the preamp out jack. Note that due to the impedance mismatch what you hear will not be very loud. Now change the state of the clean OD. Did you hear a faint pop?

Next plug a LOW impedance device OR even an instrument cable into the power amp "input" jack. Do this with the power off then warm amp up.
Now, change the state of the clean OD. Did you hear a faint pop?

Now for the analysis. If you did hear one in the first test and NOT in the second, the pop you are hearing is the "NATURE OF THE BEAST".

I can tell you from the design that the pop you hear is from coupling within the clean and OD relays within the unit. There is no cure for this within the unit other than find another brand...

I would recommend that you use an EXTERNAL pedal for the effects you want rather than trying to use the clean OD in this amp. I suspect it was never intended to be shifted during playing as I can guarantee it will pop when you shift while having anything other than dead silence (not even a bit of hum from your guitar). There is also statistical noise in the preamp that the laws of physics will not let us get around that may be enough to create a bit of a pop.

You could also use a volume pedal between the preamp output and the power amp in to throttle the volume to zero before shifting to OD.

In general I think you will find that what you are hearing is the nature of this beast.

i had an amp do that a few years ago i did everything it turned out that it was the cdplayer. then agin myfriend had the problem and it was his altonator he had to get a ground loop isolator they are cheap