I need schematics for this amp. know where I can get them?

Thread Hartke GT100 power amp section schematic needed

Try the second link. First one mentioned is busted.

We will need to know the make and model to help you.

You'll find one here-

Amp Archives Marshall Schematics Layouts MG Schematics

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.

Companies are stingy with schematics. If you know the part is bad just replace it. Hint: MOST of the companies use the manufacturer's application note schematics for their designs. Here is one for the TDA2040:

http://circuitdiagram.net/20w-hi-fi-power-amplifier-with-tda2040.html

When ordering the part make sure to get either the H or V version to match the one you are replacing... the leads are pre-bent. Use thermal compound grease and if there is an insulator make sure it is OK. Often there is a shoulder washer insulator for the screw.

That high a voltage MIGHT indicate the output tubes are NOT loading the supply enough. You don't mention the voltages andthe tubes used in the unit. I have a schematic for a AH100 but I don't know if it is close to your unit. That schematic shows four output tubes.
Remember if you put matched tubesas pairs, the pairs need to be on opposite sides of the output transformer.

Most of the problems with the small guitar amps are blown power amp chips. They usually use chips like the TDA2030 which look like a power transistor.
Most other problems involve broken connectors, bad solder joints or cracked circuit boards. The power supply area is so simple one doesn't need a schematic for that part which is usually just three terminal regulators for +/-15 volts. Schematics are often hard to find.
Try this site, although this is a different model, much of the schematic will likely be the same.

http://elektrotanya.com/marshall_valvestate10_10w_8001_8010.pdf/download.html

Try posting on some of the guitar forums. The schematics you are looking for are only available to licensed repair persons but you might get lucky and find someone who will send them to you. Be sure to state what model amplifier you want. If you are a tech try looking at some schematics for a similar amp and tracing the circuit.

If you still want the schematics for the Marshall MG30DFX Steve I have them and can email them to you if you want

Take a look at this diagram. Even though your guitar may not have Seymour Duncan's, the wiring is all the same. Go to their website if you have a different pickup & control config.

http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=2h_1v_1t_3w