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Re: i have a crate vtx200s has very little volume...
Hi, you hadnt mentioned how long you've had the amp, or how new it is, so I'm going to assume it's new to you. The Crate VTX200 has 3 channels, each with its own volume level. Let's check the simple things first:
1. Check to make sure you're adjusting the same volume knob volume knob to the same channel. The active channel will be lit with a green light.
2. Check the cables from the "Speaker Out" jacks on the amp (if you are using them). Are they plugged in all the way, or are they damaged?
3. Are you playing through a preset that you may have accidentally made "low", and may not be aware of or are stuck in it?
If none of these answers helps, there might be a problem with the input buffer in the circuit or possibly within the damping circuit of the speakers. I'd advise having the amp serviced to confirm an internal electrical problem also. If you don't have a manual for the amp, one can be found here: http://www.manualguru.com/crate-amplifiers/vtx200/users-manual
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Check your guitar with another amp, or a different guitar with this one with no effects pedals, etc, to narrow it down to just the amp. At that point, try reversing the polarity. If none of the above helps, you may indeed have a bad ground somewhere and you'll need a tech to follow it to the source.
This is a warm up issue and can probably best be found by using circuit cooler on suspected components.
Other possible problems may be a bad solder joint or cracked circuit board.
Candle the board with a bright light to look for cracks.
Bad solder joints take experience to spot, but pay particular attention where panel mounted volume controls solder to the circuit board. Looking for the little ring around the solder menicus takes a sharp eye and good lighting. Resolder any suspected bad joints.
You can reach the limiting IRRESPECTIVE of where the volume control is set when you have a guitar or other source that has HIGH output.
Guitars that have battery in them with internal amplifiers are an example of a high output guitar. Plain inductive pickups may require the volume control to be set at say 70% to reach limiting.
Please NOTE that the volume control is NOT linear, but is an "audio taper".
Limiting means you are probably driving it too hard. Many learn the hard way when speakers and thee power amp fail.
When the cone is driven too far beyond the pole pieces of the magnet, then the IMPEDANCE of the speaker becomes relatively low and can damage the power amp. The limiter tries to prevent this by sensing the current and or voltage and will back off the gain internally. This causes distortion when it happens.
Check the input RCA plug going into the reverb tank (silver box with two wires connected to it). Make sure the amp is off when you do this. Sounds like the output is working fine if hitting the amp does it.
If you can solder, try resoldering any connections on the board that appear grainy or have rings. It is likely that after the unit has been working for a while, the heat is causing a marginal connection to open up.