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  #1  
Old 09-16-2008, 05:37 PM
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SoCal Sam SoCal Sam is offline
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Pioneer SX-990?

Is the Pioneer SX-990 a real Pioneer product? I saw one this morning and it looked like a knockoff of a SX-750 or SX-780. The Pioneer lettering was different and the looks were low rent.
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Old 09-16-2008, 06:03 PM
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Yes, it is a real Pioneer product, ca 1969-70, IIRC. It's actually a pretty good little receiver, and it even has preamp outputs, and a decent tuner.
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Old 09-16-2008, 07:06 PM
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Doesn't the SX-990 also incorporate a built-in reverb?

I've heard good things about them, especially the build quality.




Retro
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Old 09-16-2008, 07:27 PM
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No, on the built in reverb, yes on the build quality. ~30 lbs for 27wpc, not bad.
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Old 09-16-2008, 07:31 PM
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Oh yeah, that was the SX-9000 I was thinking of....




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Old 09-16-2008, 08:27 PM
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Quote:
Originally Posted by SoCal Sam View Post
Is the Pioneer SX-990 a real Pioneer product? I saw one this morning and it looked like a knockoff of a SX-750 or SX-780. The Pioneer lettering was different and the looks were low rent.
Not like the 750 with the shelf on the rear.

It does have the european type speaker holes on the rear but was sold with adapters in the US. You can use thin wire inserted in the slots and it will work fine. CAT-5 works great.

Dececnt little unit with a nice phono stage.

JMO
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Old 09-17-2008, 02:59 AM
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Quote:
Originally Posted by SoCal Sam View Post
Is the Pioneer SX-990 a real Pioneer product? I saw one this morning and it looked like a knockoff of a SX-750 or SX-780. The Pioneer lettering was different and the looks were low rent.
I have a SA 900 and I believe the SX 990 is in the same line but with the added tuner Great solid build and 80 WPC ( SA 900).
Just won a Sx 9000 off the "Bay" with the built in reverb It's a beautiful looking receiver, Will post pictures later.

Last edited by kydog; 04-26-2011 at 05:39 PM.
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Old 09-17-2008, 09:49 PM
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I had a 990, second best Pioneer I ever owned. I actually like the looks with real walnut cab
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  #9  
Old 04-25-2011, 08:11 AM
porphyriaboy porphyriaboy is offline
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I got one from ebay for about $10.00 It is pretty...haven't even tested it yet. I would guess that, if the adjustments and parts haven't "drifted" out of spec the tuner should be great. We have two stations worth listening to. Everything else is clearchannel drivel, country or pop, two choices. The 990 IS heavy...anxious to hear it...
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Old 04-25-2011, 09:16 AM
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Yes

http://www.classicaudio.com/value/pio/SX990.html

I fixed one of those for a friend. Part of the repair included a re-cap of the amp. I was very impressed with the tuner and the sound after getting working right. I see $300 MSRP in 71-73. Pretty decent price for the time period.

To me, it had that warm, mellow, throaty "tube like" sound. The early Pioneers that I've heard seem to all have that sound.


I LIKE them.
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Old 07-03-2011, 09:06 PM
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Quote:
Originally Posted by blhagstrom View Post
To me, it had that warm, mellow, throaty "tube like" sound. The early Pioneers that I've heard seem to all have that sound.
Single-ended push pull design. No wonder the sound is so good. If my darling SWMBO had not put a stop to my buying, then I'd be picking up one which is on the 'Bay locally as we type...
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  #12  
Old 07-04-2011, 02:51 PM
andrykowski andrykowski is offline
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this is my first post, and i hope im not hijacking this thread, but i recently obtained one of these beauties from a relative. its been kept in a climate-controlled room and hardly used for the past 35 years. i hooked it up today and it turns on and performs its designated functions (switching am/fm, phono, aux), but the sound is very muted and there is almost no bass. its not the speakers and i tried several sets of speaker wire, to no avail. my next step is to get some contact cleaner and clean everything out. are there any other suggestions, short of replacing all the caps? thanks in advance
edit: alright, so it turns out the mute switch was intermittent and activating itself randomly. i had the volume all the way up and was getting some crossover noise, when i tapped the panel beside the switch and got actual sound! now, my left channel isnt working, in both the a and b speaker set. i switched plugs and speaker outs, messed with the balance control and it seems the entire left channel is non functional. any recommendations for this? thank you again for any input or insight.

Last edited by andrykowski; 07-04-2011 at 05:23 PM. Reason: edited
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  #13  
Old 07-04-2011, 10:53 PM
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larryderouin larryderouin is offline
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Open it up and clean EVERY SWITCH, POT, and CONTACT(Headphones, etc) on the Front AND the back, with D-5 De-Oxit FIRST. This should rule out poor contacts in them. Read "The IDIOT's Guide to De-Oxit, Revisited" here.......

Follow the directions for the De-Oxit in the thread. You'll more than likely need the Service manual to open it up correctly. Get it INSIDE all the Switches, and Pots thru the slots and holes in the cases. Exercise the living hell out of them.

Let it dry out for a while, then power it up with the Volume @ ZERO (all the way off). Then slowly increase the volume. It should work.

Larry
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  #14  
Old 07-05-2011, 03:57 PM
andrykowski andrykowski is offline
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thank you much for the link. i know a little about deoxit and amps in general from my guitar playing days, but the rules regarding hi-fi are a little different. thanks again
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  #15  
Old 07-06-2011, 08:55 AM
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expereince

The one I fixed for the friend had some work done once.
The resistors near the main ouputs were replaced on one side (and perhaps some of the driver transistors, been a while).
When I got to it, it had a weak channel.
It turned out to be a bad resistor on the other (non-serviced) side.
The amp section is not too complicated, tough to find much info, the SM is almost useless but AK threads have a lot of info.

Look closely at the big resistors on the top of the amp board. The one I worked on had some corrosion on the legs.
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