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No you need a preamp for the microphone found on audio mixers. You will not get good sound from it even if you do buy a mini mixer to provide a preamp for the mic. I would suggest a pa like the ones in this link. Most of them have built in mixers (with preamps) also.
One of the preamp IC's may have failed. They used LM3080N and RC4558 IC's- the 4558 you can use any 4558 as they were all high quality lo noise. The LM3080N may still be available from Mouser, i did not check them. NTE may have a replacement, but not likely to be as quiet as the original.
Even with schematic- which they do not have a provision for me to dupload, You would still end up and either buzz test starting from the output transistors and working back OR putting an audio source on the input and using a high impedance old style headphone like they used to use for ham radio (or modern earbuds connected to an impedance matching transformer low impedance winding and the high impedance winding ) you simply attach one lead to ground and then attach a test lead to the other end of the winding and work your way forward until you lose the audio signal.
Outputs of 4558 are pins 1 and 7, and inputs are 2&3 and 5&6 Do not be surprised if one input goes quiet- if both go quiet you are close. The outputs are the more important test point. These are directly in the audio path and most likely for one to have failed.
First of all confirm if the speaker impedance is not lower then the recommended Ohms at the back of the Mixer speaker socket.You can use an 8 Ohms speaker on a 4 Ohms amplifier but not vise versa . Next see if the fan on the mixer works. If not the Amp is getting very hot and this will lead to unwanted distortion. You can confirm if its a heat related issue by playing the mixer at low volumes for more than an hour and see if it distorts.
It sounds as though you are pointing the peavey at the band in a practice situation? If so make sure that each speaker is at about 60 degree angle to either side of the back of the mike (you facing the speakers), most mics reject feedback when the the user is directly in front of a monitor, but Beta 58s' tend to feedback more in that situation. Alternatively (if it is a practice room situation), why not place the speakers behind the band at 60 degrees each and turn to face the band.
You should consider a microphone with more power to get the volume you need. I can personally recommend the CAD C195 Cardoid Condensor microphone. It has great output. The only downsidefor most people is that they don't have phantom power. This is what gives the mic its boost. In order to get the most out of any micrphone, you need to have a preamp, an equilizer, and an output. The output is your PA system that drumbanger mentioned.
But since you are using a Peavey, here is my strong recommendation. Get a mini preamp, and hook it up to your Peavey. You can use a Behringer 2mic mixing board for your preamp. It's small, and it can sit right on top of the Peavey.
clearer sound = more watts / more power. amp watts? speaker load/impedence ohms output from amp? those peavey speakers will sound good if they are powered correctly. plus try to keep the mic away from the speakers, which brings me to my next suggestion..... mic??? this will also affect your clarity. yostamplifier.com