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Pioneer SX-690

AM/FM Stereo Receiver (1978-80)

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Pioneer SX-690

Description

The Pioneer SX-690 is an AM/FM stereo receiver with 2 hybrid ICs power amplifier output containing bias, driver and output stages in quasi-complementary circuits. Output is direct-coupled OCL following a first-stage differential amplifier.

Features include Pioneer's exclusive PLL MPX IC incorporating automaitc pilot signal canceller and a CR-type tone control network.

Specifications

Tuning range: FM, MW

Power output: 30 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 60kHz

Total harmonic distortion: 0.1%

Signal to noise ratio: 75dB (MM), 90dB (line)

Dimensions: 435 x 144.5 x 314mm

Weight: 8.9kg

Year: 1978

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Reviews

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rating
Reviewed Nov 23rd, 2018 by

Really nice receiver , sounds great with plenty of bass and treble..nice phono stage

rating
Reviewed May 08th, 2017 by

Here is my two cents, for what little that is worth!
A wonderful audio experience
These do not get a lot of love, i used to say yeah they look nice, but they have no power, probably not as good as the larger family members.
Well i was wrong, this thing just sings! Coupled with some high efficiency speakers, this thing made my feet tap and my head bob. I stopped looking at the unit like a piece of low end audio gear, and just listened to the music, it just pulled me in and wouldn't let go. I am not good at spewing out the verbiage that is thrown around when describing how a unit sounds, but i do know this, when i stuck this on, i was amazed. Its so unassuming, but it is delightful, small but plenty powerful, gotta love those meters bouncing to the music too. Pioneer knew how to make them. Snap one up for yourself!

 

Comments

breaker-bar-jon's picture

re: SX-690

Just picked one of these up sx690.
Great looking amp & sounds amazing.
But I have a “hum” at low volume.
It’s through all speakers, A & B, L & R.
I’ve had it in to a repair shop and they’ve changed a load of caps. Got it back and still hums.
Playing it into 4 x Celestion Ditton 33’s.
I also have an SX650 which when connected up has no hum.
Seems to do it on all function inputs but not always on AUX which I think repair shop tested it on.

Any ideas? Dirty pots/switches or something else?

re: SX-690

You might check voltages on transistor Q401. It's the regulator for the +13V supply. It normally removes all audible traces of power hum from the +13V rail. The collector on pin 2 should be at about +30V. The emitter on pin 3 should be about +13.6V with no more than a few mV ripple. In most Pioneer SX-series receivers this transistor gets warm in normal operation, and it frequently fails from heat cycling. D44H11 replaces it. Painting its aluminum heat-sink flat black will help the transistor run a little cooler.

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breaker-bar-jon's picture

re: SX-690

Thanks for the reply, I’ll give that a try.
I’ve noticed the hum is there even when the volume is turned fully down, the gets a tad louder when up to a quarter but that’s it.
Does it on all input selections even with nothing connected.
Thanks again.

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