Try to clean the vol. control with some elctronics parts cleaner, it comes in an aresol and you spray it into the pot, the crackling is dust or dirt in the potentiometer<pot> this is a common problem on older machines that havent been used in a while or live in a dirty enviorment.
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if only happens on certain calls it could either be the handset itself, a week point on all corded phones is the cable between the handset and the body of the phone. whilst talking to someone on a call wiggle the cord where it enters the handset, does it crackle if not do the same where the cord enters the phone body, if no crackle likely not phone.
next select a line if you have more than 1 line note which 1 and dial 17070. this will BT autotest the line. if more than 1 line on system do same for all lines. check with your system admin if there are quick codes to select individual lines, eg dial 9 for any line or 81 for line 1 82 for line 2 etc .
if you get crackle still on 1 of the lines get your maintainer to check the lione at the cable head where lines enter building
This is perfectly normal as the oil gets thicker the colder it is and over a period of time it's viscosity changes.Once the temperature gets above a certain point the oil will melt and the heat will flow through more freely so the popping/crackling stops.
Check valve you replaced has made proper contact in socket. Plug it in and out a few times to clean pins. Is inteference/crackling noise there when volume is turned down to minimum. This should tell you whether the problem lies before or after the volume control. A good clean can solve many faults. Servisol on pots works wonders.
Buzzing could be normal for this amp, especially if you have the gain cranked way up (or the volume way up) see if the buzz goes away when you turn the gain/volume down. If not, there is a problem that needs to be properly diagnosed by the amp tech at your local music store. The crackling is also unfortunately rather normal for an amp that's a little older. Oxidation builds up inside the knobs and makes that noise as you turn them. If it only happens when you change settings I wouldn't worry about it, but if it gets bad, a tech guy can clean it out for you.
If the sound crackles when the volume is turned up or down there may be an issue with the volume switch. If the volume is going up and down on its own, I would recommend that you need a new unit as the cost would be greater to fix, then to replace.
If these speakers are internal to the TV, chances are an internal component is getting noisy -- probably a capacitor -- and will eventually need replacement. That's not something you can do yourself. It's also possible there's a loose connection or a noisy volume control, but that's less likely, and again, would require a qualified serviceman.
If the speakers are external - that is, you've plugged them into the set -- check the connections at the set and at the speaker to make sure they're not corroded and are firmly seated. Sometimes just unplugging and replugging them a couple of times rubs off enough corrosion to solve the problem. Also wiggle the wires close to the connectors on the cables. If that causes the crackle, replace the cables.
Generally, crackling noises come from anyplace there is a mechancial connection for the sound signal. The volume control, main/remote speaker switch and possibly the headphone jack. That is where the contacts must be cleaned, but it requires dissassembly. Try operating the main/remote speaker switches, and plug/unplug a headphone several times. I am assuming there is still audio behind that crackling. Are you using both main and remote speakers simultaneously?