I'm going to assume that you want to keep the gear, at least for a while, because it has sentimental value and it is interesting. So here are a few tips about hooking it up. Often there is more than one way to do it so I'll try to list the options but be warned, it is confusing.
Your Kenwood receiver has a tape loop which is critical to being able to run some of this gear. I'm going to start with the tape loop and how it affects your hookups.
The equalizer will have a tape loop that allows you to hook up another piece of gear with a tape loop. You hook up the EQ first in the chain because if you record cassettes you may want to EQ the incoming signal. So hook up the EQ to the receiver and then chain your SAE noise reducer and your cassette deck (see below). Here is an excellent instruction manual from AudioControl AudioControl Manual You can easily press the defeat button on the EQ if you don't want it to affect the signal.
The SAE noise reducer suppresses the clicks and pops from vinyl records. It works reasonably well (I have one). It is designed to work on a line level signal (not the low signal directly from your turntable) and it has a tape loop to allow this. This complicates matters somewhat. Hook up the turntable cables to the phono input of your receiver. Hook up the SAE to the tape loop of your EQ. Now you can hook up your cassette deck to the tape loop of the SAE.
To run this conglomeration you need to push the tape monitor button on the receiver. This will route the signal through the components hooked up to the tape loop depending on which of their tape loop buttons are pushed. To just run the EQ make sure that the tape loop on the EQ is disengaged. That prevents the downstream components (SAE & deck) from going through the tape loop. If you want to play a vinyl record and use the SAE to reduce the surface noise engage the tape loop on the EQ but make sure that the tape loop on the SAE is disengaged. If you want to run the tape deck you will need to engage the tape loop on the SAE but also press the defeat button on the SAE so it doesn't try to reduce the noise on the tape.
I've ignored the preamp and the amplifier but the principles will be the same as the receiver. It's confusing with all the tape loops and you will find yourself staring at the rack trying to figure out why something isn't working until you figure out which button you pressed (or didn't) by mistake.
One more tip about tape loops. Each manufacturer may use a different convention for naming the in & out jacks. You want to hook up the output of one loop to the input of the next one. Sometimes you have to think about it and you may get it wrong depending on the naming convention. When you hook up each component to the tape loop test it and make sure it's working. If you don't hear anything try switching the input and output cables to see if that was the problem.
Good luck!
