I have a Peavey MAX 112 Bass Combo amp. When I turn on the amp and have it plugged into the cord and bass, it immediately begins emitting a "whump whump" sound similar to the sound a beating heart makes. I've tried adjusting the dials on both the bass and the amp and neither seem to change it (when i turn the gain down it makes it softer of course). Do you know if this is a problem with the amp?

Try to find a new board. Trust me, you are not going to fix it - there is a reason the traces and board are showing burn marks. Either scrap it or just buy another one. If you toss it cut the power cord off next to the chassis.

Your amp has two inputs - Passive and Active. Do you get the same results plugging into either one? If only one works, then the other needs reconnection or replacement.

Contact Peavey toll free at 877-732-8391 or by email at [email protected],

if new, they will replace

Please add more information to improve help, does the amp just distorts in that particular note or teh entire sound is distorted? does the amp distorts at low volumes?

Check speaker impedance or disconnect speaker leads, then use a 9V battery to verify cone movement and if this test is ok, then go inside the amp, if there's no fuses blown check opamps supply voltage which should be -15V at pin-4 and +15V at pin-8, let me know your results to help improvement.

Mouser.com

Its just inside next to the power xformer.

Try these schematics:

http://elektrotanya.com/peavey_tnt115s_sch.pdf/download.html

http://elektrotanya.com/peavey_tnt_100_1974.pdf/download.html

Scroll down to "Get Manual" at the web page and click on it to download.

Please note that on the first schematic above, the power amp schematic is way down beyond the parts list and layout of the preamp section... keep scrolling. ALSO the powoer amp shows a real WIERD connection where the output transistors drive against ground and the center tap of the power supply transformer for the power amp portion then bounces around with the audio output... that is a wierd connection but it is possible.