Hi. My old Peavey amp has recently started to sporadically cut in and out. I will have the volume set and be playing bass when all of a sudden it goes silent. Sometimes it cuts back in or sometimes I turn it off and on and fiddle with the gain knob and it returns to normal.
Any idea what it could be?
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Re: Peavey TNT115 AMP cuts out
The problem is in amplifier section caused by change value resistor or leak capacitor or cold ,loose or crack solder joint parts this the common problem of over heating and shuts out the amplifier caused by abnormal distribution of current,try to check all the capacitor and resistor and replaced the defected parts ,so your receivers works normal again.
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Your sub amplifier is detecting an overdrive condition and reducing volume to prevent the output stage from burning up. When reduced volume doesn't work, output is cut completely for 10 minutes until things have cooled down.
The amp might be on protection mode when both subs are driven...sign of an overloading problem. Does it work fine at lower volume levels? Check also the amp's supply voltage if it fluctuates out of tolerance level...might also be a loose connection in the wiring or terminals in the supply rails.
Start with a clean setting - zero cut and zero gain on the Eq.
Play a song close to the amp, and then move away, playing the same notes. Do you still get the distortion?
Change lower the input gain and repeat the test.
Lower the output gain and repeat.
Are any outboard distortion pedals in the mix, such as overdrive?
Eliminate them. Run straight through from your axe to the amp.
Check for any distortion settings. Set everything including reverb to zero. When the distortion disappears, this is your base setting.
Change only ONE parameter at a time. When the distortion comes back, you have found your problem.+
The problem you have mentioned is a common one with old sets, but it also occurs in new ones also, though not frequent. You can fix this just by changing the electrolytic filter capacitors in the power supply and sub filters on the amp PCB. The new capacitors should be of the same or higher voltage rating and same capacity rating as of the existing ones. And as it is such an old one, it is better to change all the electrolytic capacitors to avoid any further problems.
Sometimes an amplifier's preamp can't handle certain signals/frequencies at a high gain, so they cut out. Bass guitars are especially prone to giving such a strong signal. I bought an older, nonworking bass amp recently and fixed it just to find it had the same problem. Best solution is to put a low ohm resistor at the amps input, but if you turn your guitar down to half volume it'll have the same effect: should prevent it from cutting out.
ADjust your Gain setting to limit just enough so the amp does not go into Protect mode. Turn your Gain all the way down, then crank up the bass from your system. GRadually turn up the gain until you trip on protect. Turn the gain back a notch and your set for no more protect.