How do i get the amp out of a kb-100 keyboard amplifier

You remove the speaker grill cloth frame from the front of the amp. The entire frame is held on by velcro onn the corners of the face of the amp. Once off, there will be 8 philips head screws holding the speaker into the cabinet.

The mixer is stereo and the amp is mono. The line level out of the mixer MAY overwhelm the KB2 regular inputs so try running the mixer into the PA input jack.

the second jack is usually for a second cabinet.



http://www.marshallamps.com/downloads/files/MG100%20hbk%20Eng.pdf



here's a link to the manual. to be sure.

if it has effects on it, you may require two cabinets for the stereo effects. in the truest sense of stereo is what i mean.

A common reason for 'distortion' with all bass amps can be either that the screws holding the speaker unit to the cabinet have worked loose or that there has been a build up of dust particles in the corrugations around the edge of the speaker cone, which rattle especially on the lower notes.
The solution is simple - remove the front grille and check the screws are tight. Use a vacuum cleaner to remove dust from the rim of the speaker cone.

Sometimes the bypass switch contacts on the effects jacks get oxidized and fail to connect the preamp to the power amp... test this by plugging another guitar cable between the two effects (send and return) and see if the amp is solid with the cable in place, These jacks in the music equipment are really not very durable. If in failed mode you can plug a cable into the effects RETURN and touch the tip and NOT get a it of hum, there is a problem in the power amp portion. Conversely if that works, then plug a set of headphones into the effects SEND and see if you can hear a signal from the inout coming through... Itwill only be on one side of the headphones (left) as it is a monaural jack. If you can't hear a weak signal here, the problem is in the preamp... LIKELY a cracked board or bad solder around one of the volume or master gain controls... a very common problem and often is intermittent... you might try wiggling the volume/gain pots sideways a tiny bit... if it pops on, remove the amp and look for bad solder on the control leads where they attach to the board.

IF YOU ARE USING THE LEFT INPUT OF THE AMP PLUG IT IN ON THE LEFT INPUT OF THE 212. RETURN AND SEND.

Verify that your CD equipment is powered from the same receptacle. Check the audio cables as boken shield would be a common cause of hum.

Use a SPEAKER RATED cable which will have good quality 1/4 inch jacks. Go from a speaker out on the head to one of the jacks provided on the speaker cabinet. NOTE: some newer speaker cabinets use SPEAKON connectors and if those are provided, they are more secure than 1/4 inch plugs/jacks.

PLEASE loop the speaker cables through a handle of the cabinet at each end to avoid them being yanked out while hot as the amplifier can be damaged if it happens.

OBSERVE the maximum load. If the amp says 4 ohms minimum, put no more than two 8 ohm cabinets on the amp as two 8 ohms parallel to 4 ohms.

DO NOT use an instrument cable.

I just removed the head from a rumble 100 I just got yesterday, you have to remove the 4 screws in the top, then the four that hold the handle on the top, and also the two from the sides. Slide the head out the back, but be careful of the wires attached so you don't rip them out (they are sort of short). Also be careful not to touch any electronic parts on the boards, some are extremely high voltage and can electrocute you (even when the amp has been unplugged)

I figured this out myself. I was just babying it too much. Some tolex had bunched up between the metal chassis and the cabinet making it feel like it was caught on something. I used a flat edge screwdriver to flatten out the tolex, and then I was able to pull the chassis out the back of the cabinet.