Pioneer SX-3700

Pioneer SX-3700 Front


From that slightly awkward time that lies between the fully analog and fully digital eras come the Pioneer SX-3700. It was 1980 and digital displays were just catching on and Pioneer sought to capitalize on the movement with its Fluroscan technology. The SX-3700 produces 45 watts per channel and incorporates a direct coupled amplifier design.


Pioneer SX-3700 Meter



There is a variant of the SX-3700 labelled the SX-820. Apparently it is a European version but has a black dial face and white Fluroscan. A couple other SX-3000 series receivers also had European variants in the SX-620, SX-720.


Pioneer SX-3700 Knob


The Fluroscan display shows the tuning for the AM or FM bands depending upon AM or FM selector button is pushed. The analog dial shows both FM and AM tuning as well. The power output meter is also a Fluroscan display. Pioneer utilized a 3 gang FM tuning capacitor and quartz servo lock technology to create a very good FM tuner section. The Fluroscan FM display is backed up by a quartz crystal oscillator that provides a stable time base so that the correct numbers will always be displayed for a given frequency selection. The display is also 5 digits as opposed to many other manufacturers that used only four digits. Pioneer referred to all of this as their P.D.Q. or Pioneer Digital/Quartz tuning technology.


Pioneer SX-3700 Inside


The SX-3700 was a mid range receiver and had bigger brothers in the SX-3800 and the SX-3900. But, those receivers had more complicated designs and are more difficult to work on than the SX-3700.


Pioneer SX-3700 Inputs


If you like the Fluroscan display then the Sx-3700 (or SX-3800, SX-3900 depending upon your budget) might be the way to go. They do look very nice in the dark and are a good representation of the technological shift from analog to digital. They are also very good performers and can be found for a price that is within most budgets. A fully serviced unit will sell for around $300 while the average working unit will sell for $150 to $200.


Vintage PIONEER SX 3700 FM Quartz Locked Stereo Receiver S Korea TESTED WORKS
Vintage PIONEER SX 3700 FM Quartz Locked Stereo Receiver S Korea TESTED WORKS $250.00
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Pioneer SX 3700 Vintage Receiver
Pioneer SX 3700 Vintage Receiver $129.99
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Pioneer SX 3700 Vintage Receiver
Pioneer SX 3700 Vintage Receiver $120.99
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11 thoughts on “Pioneer SX-3700

  1. If I remember correctly, Pioneer’s analog-tuned Fluoroscan receivers that had quartz lock (SX-3700, 3800, 3900) used a varactor to control the LO, acting as an additional ‘gang’ to those on the main tuning cap. Thus the SX-3700 and 3800 have 4 gangs, not 3 (and the SX-3900 has 5, meaning its tuner may be better than that of the TOTL SX-D7000!).

    Now if you’d only do the SX-D7000 next… 😉

  2. Always awesome reviews! love old vintage stereos, They don’t make them like they used to definitely applies to stereo equipment. Thanks for bringing back memories of the cool stuff from back in the day. Someday hope to put together a vintage stereo system,

  3. Slight correction to the wording of the review. The review is written stating that the digital display only shows FM tuning, while the analog display showed both AM and FM. This isn’t entirely accurate. The digital shows both AM and FM as well.

  4. I recently sold my SX-3700 to a friend who needed a receiver powerful enough to drive a pair of Bose 901 series one speakers.He did not know much about stereos and I was concerned about it’s rating of only 45 wpc.Most of my receivers are over 100 wpc,so I did have something to which to compare power outputs.For only 45 wpc this thing had more than enough for the aforementioned application.My guess (educated from years of experience) is that it is comparable to others rated at 60 wpc.Powerful,superb tuner,and one of the most tubelike Pioneers I have owned( SX 780, 890,1250) .About to buy another one for less than $100,and it was just serviced and looks great!!

  5. Gents, maybe you can help. Mine is fine except the quartz tuning no longer holds the frequency (FM). Is it possible to replace with new or make sense to just use it as an amp for other inputs?

  6. I just got this old receiver back from my father’s house in Tennessee. My grandpa bought this for me when I was 15 years old. I’m so excited brings back alot of memories. It’s still in excellent shape and works like a charm. I had forgotten how heavy it was lol. Cant wait to hook up my turntable and play all my old albums and 45s.

  7. got a pioneer sx-3700 receiver, been had it for about 20 years. just started back
    using it after about the last three years. cleaned it up with a product called
    deoxit and it sounds like new. they don’t make recievers like the vintage stuff
    any more.

  8. Was just given a SX 3700 from a coworker(been sitting in a closet for years)
    and it has minor problems, balance not working, tuner not accurate but i only need one station here in NOLA and its locking in if i play with it . Tons of power, got a couole Sony satellites so i’m gonna see if i can find a deal on a subwoofer. Yeah, it looks cool in the dark, power meters are a hoot.

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