I have a Technics SA-GX130 receiver with a flaky volume control

How did your remote work before this issue; meaning when you pushed the volume control buttons, did the knob on the receiver turn?

Yes, you can. Go to a local electronics store or go online and buy a cable (we used to call them patch cords back in the day) with a 1/8" STEREO plug, (also called a mini phone plug) on one end and two phono plugs (also called RCA plugs) on the other end. They're available in various lengths -- 12" is a good choice. We're talking less than $10 here.

Connect the RCA plugs into an appropriate pair of unused INPUT jacks on the back of your receiver -- CD, VCR1, Tape Monitor/VCR2 will do. DO NOT use the phono jacks. The red plug is for the right channel. You can leave the cable plugged in. Then whenever you want to listen to your iPod, insert the mini phone plug into the iPod's earphone jack, switch the receiver to the input for the cable, and start playing. You may have to increase the volume on your iPod to avoid having to turn the receiver all the way up (or down) to listen, but after that you can use the receiver's volume control.

You need something like this:
AV composite video to tv rca cable USB for Apple iPad 1 iPad 2 iPhone...

buy some turner cleaner or electrical contact cleaner(radio shack) with the power off take the volume knob off spray into the area where the knob goes(the little metal post) turn the post back and forth with your fingers or needel nose plyers several times (over time dust and dirt build up makes a bad connection) you may have to do this a couple of times dont worry this stuff drys realy fast this should do the trick

http://www.hifi-remote.com/codes-amp.shtml

But better to buy a facsimile remote for your model, an exact copy!

https://www.ebay.com/itm/Replacement-Remote-for-TECHNICS-SAGX330-RAKSA303P-SAG9013P-SAGX130-/111089776701


https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk02_4O6eLuVa5S4BwiPDarR4kVv6-A%3A1611115680170&ei=oKwHYJ_gCaKs5NoPx6GR2Ac&q=Technics+SA-GX130+replacement+remote

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Remove the cover and get some contact cleaner to spray into the volume control potentiometer assembly...this shoud fix it

If with another position of the volume buttom the sound is normal, maybe the problem can be dust or something jammed between volume buttom and its knob. Try to carefully pull out the volume buttom from the unit and then clean its internal part with some neutral lubricant as well as the knob where it it is fixed.

press and hold the station button for 10 seconds

Sounds like a dirty pot. With the receiver off turn or slide it back from one side to the other. Test it, if its a little better you can clean it with a little (a drop or two) of wd40, You will probably need to remove the cover to get to it.

bad solder connections and or dirty controls.