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Pioneer Model SX-1250 Receiver

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Front View
Image Attribution: Unknown Ebay Auction
Date: March 13th, 2000


Rear View
Image Attribution: Unknown Ebay Auction
Date: March 13th, 2000

General
DescriptionReceiver
RarityScarce
Designed inJapan
Manufactured InJapan
Wood CaseWalnut Veneer
ChannelsTwo
IC Count6
FET Count5
Transistor Count86
Diode Count59
Speaker ConnectionsThree sets
AC SwitchYes

Valuation, Purchases, Parts and Manuals

Physical
Width21 7/8
Height7 3/8
Depth18 3/4
Weight64 lbs

Amplifier
RMS Power Per Channel165 into 8 ohms, 200 into 4 ohms, 20 Hz to 20 KHz
Damping Factor @ Load Impedance30, 20 Hz to 20 KHz into 8 ohms
Total Harmonic Distortion (THD)0.1% at full rated power into 8 or 4 ohms, no more than 0.05% at 80 watts/channel
Frequency Response5 Hz to 100 KHz, + 0 dB, - 1 dB
Hum and Noise100 dB
Intermodulation Distortion (IM)No more than 0.1% at full rated power, no more than 0.05% at 80 watts/channel

FM Tuner
RF Sensitivity1.5 uV (8.7 dBF)
300 Ohm Binding PostsYes
75 Ohm Binding PostsYes
50 dB quieting sensitivity, Stereo35 uV, 36 dBF
50 dB quieting sensitivity, Mono2.1 uV, 11.5 dBF
THD, Mono0.1%
THD, Stereo0.2%
Signal to Noise Ratio, Mono80 dB at 65 dBF
Signal to Noise Ratio, Stereo74 dB at 65 dBF
Frequency Response30 Hz to 15 KHz, + 0.3 dB, -1 dB
Capture Ratio1.0 dB
IF Image Rejection110 dB
IF Rejection120 dB
Stereo Subcarrier Rejection74 dB
SCA Suppression74 dB
Alternate Channel Selectivity (wide or normal)83 dB
Spurious Rejection110 dB
AM Carrier Rejection60 dB
Stereo Separation at 1 kHz50 dB
Mono SwitchYes
Signal Strength MeterYes
Center Tuning MeterYes
Stereo LampYes
Multipath ListenYes
Muting Switch2.5 uV (13 dBF) fixed
Quadradial Output (FM Discriminator output, unequalized)Yes

AM Tuner
RF Sensitivity300 uV/meter or 15 uV with external antenna
Alternate Channel Selectivity40 dB
IF Rejection85 dB
Image Rejection65 dB
Signal to Noise Ratio55 dB

Preamplifier
Multiple Bass Adjustments+/- 10 dB at 100 Hz, and +/- 5 dB at 50 Hz
Multiple Treble Adjustments+/- 10 dB at 10 KHz, and +/- 5 dB at 20 KHz
Tone Control DefeatYes
High Filter8 KHz, 12 dB/octave
Low Filter30 Hz, 12 dB/octave
Gain ControlCalibrated detent knob
Loudness Contour+ 6 dB at 100 Hz, + 3 dB at 10 KHz
MonoYes
Muting-20 dB
BalanceYes
Number of Tape MonitorsTwo
Tape to Tape DubbingYes
Auxillary Input SourceYes
Phono Input SourceYes
Speaker Selection NomenclatureA, B, C

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