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Post by Jim D. on Jan 4, 2021 10:46:23 GMT -5
I know this general topic has been covered before, but I just want to make certain I am heading in the right direction. I am the original owner of a Pioneer SA 9100 integrated amp/preamp. These have actually become sought after and valuable. I have set this up with other original stereo gear for a dedicated music listening system. Speakers for instance are the original JBL studio monitors. I forgot how great this sounds, as the stereo mode in a good AV receiver does not come close. What is the recommended product(s) to use to mitigate popping, crackling, etc. when changing switch or pot settings? If I change settings back and forth a few times, the unit is quiet and trouble free, but it bothers me that contacts are obviously dirty. The tone controls on this for instance are not a full sweep as with a conventional pot, but have increments with what I will call detent positions. I have not taken the chassis out of the enclosure yet, but I imagine any spray regardless of how well it is directed will get on many other internal components. Advice genuinely appreciated.
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Post by Peegoo 🏁 on Jan 6, 2021 8:53:45 GMT -5
Many techs use Caig Deoxit D5 (not D100, F5, or F100) and just shoot it into the pot. That does help, but the following procedure will give better results. If you cannot find Deoxit--there are other brands--make sure to get electrical contact/switch cleaner that is specifically safe for plastics. CRC QD is a great cleaner for stuff like this, but it's good practice to follow with D5 because the D5 leaves a tiny amount of lubrication to keep the pot working smoothly. IMPORTANT: this procedure requires removing the case/cover which exposes you to potentially lethal voltages. Unplug the device and drain all filter caps in the power supply. Use a meter to confirm there are no voltages present in the circuit before proceding. If you're unfamiliar with working on these things, get some experienced help. Put on safety goggles to protect your high-balls. Pack paper towel or newspaper around the pot to protect the other components from overspray and catch drips. Hold the end of the cleaner's tube/straw at the opening in the back of the pot and give it a half-second blast. NOTE: do not stick the tube into the pot because the little rotary wiper in the pot can be damaged if you poke it with the tube. Immediately rotate the control's knob about 20 times through its full rotation. This makes the wiper scrub the resistive track and cleans the contact surfaces. Give the pot another half-second blast of cleaner, and then immediately blast the pot with an aerosol duster or compressed air to blow out any debris. Some people recommend shooting cleaner down the side of the control shaft of a pot (from the front-panel side after you remove the knob), but that is nowhere nearly as effective as cleaning from the back of the pot because blowing air into the pot is just as important to the cleaning process as using the aerosol contact cleaner. Pay attention to the price because there are several vendors that sell this stuff and the price can swing as much as five bucks. If you search on "Caig Deoxit," you'll get one price. If you search on "Hosa Deoxit," which is the exact same stuff, it's cheaper: www.amazon.com/Hosa-D5S-6-DeoxIT-Contact-Cleaner/dp/B00006LVEU/ref=sr_1_1 |
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Post by Jim D. on Jan 6, 2021 13:03:36 GMT -5
Peegoo, thanks for your courtesy and knowledgeable response. I may have this done professionally, but will remove the chassis, drain the caps, double check with my Fluke meter and then decide.
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Post by Ragtop on Jan 29, 2021 18:27:55 GMT -5
I looked up the SA9100 and all I can say is "WOW!" That is a fine piece of gear.
I had a Pioneer AM/FM Receiver from the same era. Maybe a SX560? Can't recall. But my daughter has it now, along with all my other Pioneer stuff from the '70s, and it's all still going strong.
Maybe it wasn't the absolute top of the line, but Pioneer made good gear.
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RogerD
Wholenote
Fraternity, Dedication, & Passion
Posts: 181
Formerly Known As: Roger D
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Post by RogerD on Jan 31, 2021 10:03:26 GMT -5
I once had a Pioneer SX-434 from the 70's, the low end model of the series, and attempted to clean and lube the potentiometers.
The chassis design did not permit access for this service.
Hopefully your model will not prove to be as impossible.
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Post by Jim D. on Jan 31, 2021 11:52:24 GMT -5
RogerD, I pulled out the chassis and drained the caps. Many such components are not accessible as was your experience. I had this in storage for literally decades. Now that I am using it and exercising the switches and settings, it has cleaned up nicely. There is an occasional pop when changing settings but nothing major. I forgot what a good amp/preamp this is. It was considered their professional model. The other day I used an 8 channel mixer I have and plugged into the microphone 1/4" jack inputs on the Pioneer. You can go stereo or switch either jack into right and left combined channels.The speakers I used are the old JBL 4300 studio monitor series. The woofers I had re-coned some time back. I was using an acoustic with a K&K pickup and an microphone for vocals. You could play a small club with this set up. I will primarily use this equipment for recorded music listening including LPs, but this has proved to be a good amp for home use in many ways. It was like discovering an old friend. If memory serves me correctly, I bought this new in around 1973. I have a rather high end surround sound receiver and in stereo music listening mode it sounds mediocre compared to this forty eight year old beast. I did have a friend of mine use a variac to power it up after decades of storage, but so far it is totally solid and every single channel and function works as new. I really wanted a McIntosh tube amp/preamp when I bought this, but then as now, that was not in my budget. Not such a bad choice as it turned out.
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Post by Jim D. on Jan 31, 2021 12:01:27 GMT -5
PS: I just weighed this tank. It weighs right at 30 pounds!
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RogerD
Wholenote
Fraternity, Dedication, & Passion
Posts: 181
Formerly Known As: Roger D
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Post by RogerD on Feb 1, 2021 12:07:54 GMT -5
Jim D,
great to hear that the pots are clearing up for you. And, 30 pounds, wow!
You are very fortunate to be able to have such a nice unit. It sounds like it's a 'keeper'.
In 1976, when I purchased mine, I was not exactly affluent. I was just able to scrape together $150 for the amp and another $150 for a pair of speakers.
But it served me well for many years until rather recently actually when I sold it on. I purchased a nice Onkyo receiver with blue-tooth capability and a remote control.
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