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Pioneer SX-1250

AM/FM Stereo Receiver (1976-1977)

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Pioneer SX-1250

Description

When you go to buy a new receiver, ask yourself these questions:

Does its FM tuner section guarantee high performance of spurious rejection as well as high sensitivity?

Does it include the very latest electronics circuit technology to assure a constant stable and high quality sound reproduction from small to large power output?

Are you going to be proud to own it for a long, long time?

Pioneer's new and elegantly designed SX-1250 AM/FM receiver provides a resounding yes to each of these questions - and then some.

No other Pioneer receiver provides such incomparable FM performance and sensitivity and then combines it with mammoth continuous power output of 160W per channel, min RMS at 8 Ohms, from 20 Hertz to 20,000 Hertz, with no more than 0.1% total harmonic distortion.

Specifications

Tuning range: FM, MW

Power output: 160 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.1%

Damping factor: 30

Input sensitivity: 6.5mV (mic), 2.5mV (MM), 150mV (DIN), 150mV (line)

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

Output: 150mV (line), 30mV (DIN), 1V (Pre out)

Speaker load impedance: 4Ω (minimum)

Dimensions: 556 x 186.5 x 464.5mm

Weight: 29.2kg

Year: 1976

Downloads

brochure  English

instruction/owners manual  English

exploded views  English

schematics  English

service manual  English

supplement  English

instruction/owners manual (imp scan)   English - McKenziebld

If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.

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Reviews

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rating
Submitted by MOTHAIS

best for ever receiver....

 

Comments

re: SX-1250 notes on Schematic - no 13.5V or 5.4V

Hello,
I am working on a 1250 with a power supply issue. No +13.5V or +5.4V.
I downloaded the schematic here and see pencil notes suggesting the same issue.

Also my +25V is at -10V. The schematic noted that the +25 was +6V when failing.

Sure looks like I have the same issue as the original schematic owner.

Long shot but wondering if could find the person who kindly shared the schematic and could they share their eventual findings on the issue.

Cheers -

re: SX-1250 notes on Schematic - no 13.5V or 5.4V

rebuild the PS, go to audiokarma web site and Pioneer section. many people to help you out and get Mouser bom lists

re: SX-1250 notes on Schematic - no 13.5V or 5.4V

Hello,
I did not put the pencil makes in, but have worked on many Pioneer power supplies. I would concentrate on the +25v section as this seems to provide a reference for the 13.5V and 5.4v supplies as well.
Check the 2sc1384 for open base to emitter (or greater than 1vdc across junction when unit on)
Check the 2SD313 for open base to emitter (or greater than 1vdc across junction when unit on)
Check also the Zener diode and small signal diode in the circuit as well, for short or open condition
Last but not least check the resistors for the rated value, and make sure that none of the electrolytics are shorted.
After the +25v section is fixed, the 13.5 and 5.4 should be ok. If not check the 2SC325 transistor for open.

Tom

And relating to the below comment, I am active with repair direction specifics on AudioKarma as well as HiFiengine. I also have done repairs for many years.

re: SX-1250 notes on Schematic - no 13.5V or 5.4V

Ask your question on Audiokarma.org. There are people there who repair these units.

re: SX-1250

Hello. I have an SX-1250, does anyone have any idea where I can get a full service on the unit, I live in Los Angeles, CA. Thank you

SX-1250

Purchased brand new in Columbus, Ohio in 1977 and it still kicks ass! Not bad for a system that is over 35 years old. Serviced only 3 times and replaced CAPS, and some 'dusty' tuner components.

Love this receiver, possibly the best BBA receiver Pioneer marketed to the US. I also matched this receiver with 2 Pioneer HPM-500 floor speakers (well, by today's standards you could call them small condominiums). Giant 15" monster woofers.

Love the 70' big bottom audio!

My 1250 is about to go through some changes

Thanks to finally having the service manual. I've owned this receiver for about 8 years, and now that I'm back working as an electronics tech, have every conceivable piece of test equipment available to me, and a manager who encourages me to work on personal gear, this baby is going to be special!

New PS caps, poly caps in all the audio paths, replacing the speaker terminals, and some tuner mods as well.

THANKS!

PIONEER SX 1250

thanks , thanks , supper , Glad to have one,
nice to have had your help by the manuals and schema...thanks a lot..

1250sx

Thanks..been a proud owner of this fabulous product I had been looking hi & Lo for a manual..now I have it..This receiver ROCKS!

Mods

I am about to modify mine. I will post here and let you know how it works out.

Thanks

Thanks

Pioneer SX 1250

Fantastic!! Thanks.

sx 5529

Just pulled the trigger and purchaced a sx 5529 Thanks for all the info. Great stuff.
Thank you

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