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Just found a perfectly working Pioneer SX-780!

FreaK

FreaK

is his own damn self
So far the tuner both AM and FM work, so do the lights and all the switches.
For something I found sitting on top of a garbage can in an alley and streamed water when i picked it up, It's a very nice find.
Only niggle is the knob/handle on the loudness switch is missing. I'll post a couple pics soonish.
 
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I have my LP12 through my Tom Evans Groove phono stage playing through the AUX channel right now and it is most charming. I'll try plugging the tt directly into the onboard phonostage at some point and report back.
 
Great snag!! Might bother to open it up, letting any additional moisture out, and hit those switches with first a nice wash of electronics cleaner ( i use the cheap stuff from any lowes/home depot) and follow up with a shot of faderlube.
 
The SX-780 is one of those nice sleeper units. While some panned it because it used STK0050 hybrid IC's for the output, they are great sounding units in the 45 to 50 w RMS per channel range.
 
I agree with Tom. It was PIONEER's most popular unit for 1977 thru 1979. Here goes the pan somewhat . The STK is it's weak link. Sanyo doesn't make them anymore and the cheap chinese junk replacements are not fit to run in them. Check out the PIONEER Forum for 780 replacement modules. Discreet parts and will take all the abuse you can throw at it. They are a little pricey but well worth it when finished. No more worries about the STK's, and you have a 780 that can actually push 45-50 watts without breathing hard!
 
I think the Chinese STK0050 thing is sort of a "crap-shoot". I have a 780 with an original Sanyo on one side, and a Chinese replacement pack on the other side, and I can't tell the difference. But lots of other folks experience hasn't been so good. Bill
 
I paid $10 for my SX-880 at a garage sale. The unit I found on top of the garbage can was my Lafayette LR-9090.
 
Well, so far so good on that front.
Though it is making me wonder about replacement parts for the ol Marantz 2240. A couple lights, a couple buttons, the start up relay...

On this one, the Pioneer, the B speakers are driven off the same amp stage as the A, or are there separate stages?
 
FreaK said:
Well, so far so good on that front.
Though it is making me wonder about replacement parts for the ol Marantz 2240. A couple lights, a couple buttons, the start up relay...

On this one, the Pioneer, the B speakers are driven off the same amp stage as the A, or are there separate stages?
Click to expand...
Only one amplifier output. Your speaker selector switch selects which set of speakers (or both) are connected to this output. Bill
 
Contrary to what the manual says, try to stay away from 4ohm loads (ie: 4 ohm on one spkr, or 2-8ohm spkrs on A & B running at the same time). They will heat up very fast on a 4 ohm load and can die from the heat build up. If you must run A&B spkrs, use 16ohm spkrs which in a parallel setup will get you 8ohms total.
 
She’s now at home at the parent’s place running my JBL 4330A speakers. Dunno how much use she gets or how the phono section stacks up to what they were using. Never used the phono since I run MC and don’t own a SUT. Every once in a while I consider repatriating those big speakers and trying to build a bi amped Exemplar type system out of the drivers.
 
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