I pretty much have the same problem... i plug in a jack lead to L/MONO into my bass amp, i get nothing, also just putting headphones in the back i get nothing... i have ordered a USB/MIDI interface cable, but i don't want to have to keep using it through my laptop (that is if it works rather then doing what it already is doing...) any advice?
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The low in side jack has a lower vol. but should only be1/4 less than the high in jack on most amps, --try this,-- plug guitar in high in then take all the treble off and 1/2 mid. range bring up bass range and if you have equauzation bring down 26k 5k 10k about 2 notches or points. See if that give you better bass tone.
Does your M foot switch work on the Fender? If you know how to use a multimeter you could check continuity by putting meter leads on plug of M foot switch(1 on tip, 1 on sleeve ) You should see a change in the multi meter when you depress switch. If so switch is good. Another easy test is with cap off a spare 1/4 plug -plug it in to foot switch jack.put a alligator or some such metal clip or wire and join(called short or shorting) the two inputs . If connecting and unconnecting results in switching then the foot switch is suspect. One fairly common thing is that foot switch and input jack are often sautered straight to a circuit board to save $ on production cost. Used to be all point to point where a wire was attached to 1/4" input and then wire went to circuit board or tubes. The wire has give, but not so with direct wiring to board. So the nut holding the 1/4" amp input gets loose(doesn't have to be loose for the following to happen) and a pull on the chord causes a break in the soldier and thus a break in the sound chain. Sometimes it will work intermittingly by putting a little pressure left, right, up or down on the plugged in plug. If so, it's the input jacks connection to the amp. If not it still could be that because putting pressure on plug may not be sufficient to affect a temporary reconnection. Since switch(the new one you made)works on Fender, but not Marshall I suspect the jack or foot switch circuitry past the input jack. If using some of the above the above tests leads you that direction,remove housing(unplug a/c power 1st ) inspect jack,wiggle it slightly see or feel a break then resodier from back side. You should be able to use the soldier already present without adding extra.
Since you just bought this, exercise your warranty (assuming you bought this new). The amp probably will have a slight buzz with nothing connected... the question is how loud it is. If you can hear it loud at five feet, that is too much. If you bought this used, prepare to have it serviced at a shop.
plug in a set of headphones for personal listening / practice
to connect to an amplifier.
The zoom pedals use either a mono or (tip and sleeve) or stereo (tip, ring. sleeve) 1/4 inch jackplug - i.e a standard guitar lead.
You should plug it into a line-level or high impedance socket on your amp. With the pedal in play mode you can adjust the output level (gain) to match the input requirements of your amp by rotating the 'Value' knob (top right)
All amps make a small amount of noise (system hiss) but the amps own power supply should not cause a problem on it's own.
However if the frequency is around 50hz (the G 2 1/2 octaves below middle C on a piano) it is most likely due mains electricity interference or an earth (grounding) issue.
Here are a few things to try to identify the source.
Could be a lack of earth (grounding) This is potentially VERY DANGEROUS and could result in electric shock if you touch a metal part of the amp or touch some other metal object (like a microphone stand at the same time as your guitar strings). Check the earth wire is firmly attached at both ends of the power supply lead.
Could be a defective mains socket - try plugging it in to a different one, preferably on a totally separate circuit.
Could be an earth loop. These can occur if you are using the amp with an output to a public address system or mixer that is also earthed because of a 'potential difference' between the two earths. Solution - use the balanced (xlr) output which incorporates an earth lift rather than the unbalanced jack output.
Unplug any effects pedals, foot-switch etcetera to see if that eliminates the problem. Turn off any internal effects, including bass intensifier.
Make sure any signal cables (guitar leads) have good quality screening and that the screen is well soldered to the jack plugs at both ends.
Ensure signal leads do not lay along side (parallel) close to mains electricity cables but are well separated and only cross at right angles.
Move the amp away form other electrical equipment that may have a powerful magnetic field (especially CD or DVD players, hearing loop amplifiers, radio microphone transmitters / receivers, mobile phones
Turn around or stand in a different position - it might simply be the pick-ups in your guitar causing interference in the magnetic field of the power supply.
Does plugging in or unplugging a signal lead / guitar make any difference? This particular amp requires only mono jack plugs a stereo (trs) plug may be shorting across terminals
Does it change when you touch the strings with your hand? If yes check internal wiring and screening within the guitar.
It is NOT clear what configuration you have set up and what you consider the MONO output is, whether it is the power amp MONO side output or the line level MONO 1/4 inch jack on the top of the unit (this jack is NOT speaker output). If you can run normal stereo speakers using both sides of the power amp in the AB mode, the problems you are having is pilot error.
REMEMBER the main out 1/4 inch jacks are BALANCED TRS jacks... DO NOT put mono plugs into these.
A WARNING: If you use Speakon to 1/4 inch speaker cables, remember that the BARREL of side A is HOT, not the tip!!! You can fry the amp if you inadvertently ground that barrel someplace. (Side B has the barrel grounded) This information is NOT readily available in the manual and results in many a blown amp. They do this to implement the "Bridged" mode easily.
I have schematics and can unravel most any problem you are having.
Pretty straightforward and cheap to do. You will need a replacement jack to fit the bass and some shieled audio cable and a soldering iron and some tools. Remove the rear cover plate screws and then the plate to expose the controls and wiring. If you can take a photo and email it to me I can show you what needs doing to get you up and running. email Karl ay email@example.com
Hi there. If there is still feedback with nothing plugged into the amp, the problem is internal to the amp. Probably worn input jack or intermittent connector internal. Try thumping on amp with nothing hooked up. (guitar) Thanks Paul
Run a jack from your guitar to Input R Mono on the pedal.
Run a jack from Output R Mono on the pedal to the input of your amplifier.
There is a switch for guitar or Bass. Put the swich on guitar
You do not need a preamp to use this pedal.
Hope this helps,