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What are the general specifications of the SONY STR-V25 receiver?
The general specifications for the SONY STR-V25 are as follows:
| System: | Superheterodyne FM/AM tuner Equalizer amp section: IC op-amp, NF type Tone amp section: IC op-amp, NF type Power amp section: Pure-complementary dc amp |
| Power Requirements: | 120 V ac, 60 Hz |
| Power Consumption: | US model: 80 W Canadian model: 120 W |
| AC Outlets: | Switched 100 W Unswitched 300 W |
| Dimensions (including projecting parts and controls): | US model: Approx. 430 (w) x 135 (h) x 380 (d) mm (16 15/16 (w) x 5 3/16 (h) x 14 7/8 (d) inches) Canadian model: Approx. 460 (w) x 135 (h) x 380 (d) mm (18 (w) x 5 3/16 (h) x 14 7/8 (d) inches) |
| Weight: | US model: Approx. 7.7 kg, 17 lbs (net); Approx. 8.8 kg, 19 lbs 3 oz (in shipping carton) Canadian model: Approx. 8.5 kg, 18 lbs 12 oz (net); Approx. 9.6 kg, 21 lbs 3 oz (in shipping carton) |
What are the amplifier section specifications for the SONY STR-V25?
| Power Output and Total Harmonic Distortion: | With 8 Ω loads, both channels driven, from 20-20,000 Hz; rated 28 W per channel minimum RMS power, with no more than 0.04% total harmonic distortion from 250 mW to rated output. |
| Damping Factor: | 40 at 1 kHz, 8 Ω |
| Dynamic Headroom: | 1.5 dB |
| Intermodulation (IM) Distortion (60Hz : 7kHz = 4 : 1): | Less than 0.04% at rated output |
| Residual Noise: | Less than 0.2 mV at 8 Ω |
What are the input specifications for the SONY STR-V25?
Input specifications are measured with rated output power into 8 Ω loads (both channels driven simultaneously) at 1 kHz.
| Input | Sensitivity | Impedance | S/N | Weighting network |
|---|---|---|---|---|
| PHONO | 2.5 mV (-50 dB) | 50 kΩ | 77 dB 76 dB* |
A |
| TAPE 1, 2 | 150 mV (-14.5 dB) | 50 kΩ | 97 dB 80 dB* |
A |
| AUX | 150 mV (-14.5 dB) | 50 kΩ | 97 dB 80 dB* |
A |
* ’78 IHF
What are the output specifications for the SONY STR-V25?
Outputs are measured with rated input.
| REC OUT 1, 2 | Voltage 150 mV (-14.5 dB), Impedance 10 kΩ |
| HEADPHONES | Accepts low impedance headphones. |
| SPEAKER A, B | 8-16 Ω speakers are suitable. |
What are the frequency response and tone control specifications for the SONY STR-V25?
These specifications are measured with rated input, FM 30% modulation.
| Frequency Response: | PHONO: RIAA equalization curve ± 0.5 dB AUX, TAPE 1, 2: 5 Hz – 70 kHz +0 / -1 dB |
| Tone Controls: | BASS ± 10 dB at 50 Hz TREBLE ± 10 dB at 20 kHz |
| Loudness Control (att. 30dB): | +10 dB at 50 Hz +3 dB at 10 kHz |
What are the FM Tuner section specifications for the SONY STR-V25?
| Tuning Range: | 87.5 – 108 MHz |
| Antenna Terminals: | 300 Ω balanced 75 Ω unbalanced |
| Intermediate Frequency: | 10.7 MHz |
| Sensitivity at 50dB Quieting: | 16.1 dBf, 3.5 µV (mono) 36.1 dBf, 35 µV (stereo) |
| Usable Sensitivity: | 10.3 dBf, IHF 1.8 µV |
| Signal-to-noise Ratio: | 75 dB (mono) 70 dB (stereo) |
| Harmonic Distortion: | at 100 Hz: 0.15% (mono), 0.2% (stereo) at 1 kHz: 0.1% (mono), 0.15% (stereo) at 6 kHz: 0.15% (mono), 0.2% (stereo) |
| Separation: | 40 dB at 100 Hz 45 dB at 1 kHz 35 dB at 10 kHz |
| Frequency Response: | 30 Hz – 15 kHz ± 1 dB |
| Selectivity: | 60 dB at 400 kHz |
| Capture Ratio: | 1.5 dB |
| AM Suppression Ratio: | 50 dB |
| Image Response Ratio: | 45 dB |
| IF Response Ratio: | 90 dB |
| Spurious Response Ratio: | 75 dB |
| RF Intermodulation: | 65 dB |
| Sub-carrier Product Ratio: | 40 dB |
| Muting Threshold: | Approx. 18 µV, 25 dBf |
What are the AM Tuner section specifications for the SONY STR-V25?
| Tuning Range: | 530 kHz – 1,610 kHz |
| Antenna: | Built-in ferrite-rod antenna, External antenna terminal |
| Intermediate Frequency: | 450 kHz |
| Usable Sensitivity: | 300 µV/m, ferrite-rod antenna 100 µV, external antenna at 1,000 kHz |
| Signal-to-noise Ratio: | 50 dB at 50 mV/m |
| Harmonic Distortion: | 0.5% at 50 mV/m, 400 Hz |
| Selectivity: | 35 dB at 10 kHz |
What is the safety-related component warning for the SONY STR-V25?
COMPONENTS IDENTIFIED BY SHADING AND MARK ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
How do I remove the top cover of the SONY STR-V25?
To remove the top cover of the SONY STR-V25, follow this disassembly procedure in numerical order:
1. Remove the top cover screws from the sides and back of the unit.
2. For the Canadian model, also remove the left and right side board assemblies.
3. Lift the top cover off the unit.
How do I remove the front panel of the SONY STR-V25?
To remove the front panel, first remove the top cover. Then, follow these steps:
1. Remove the single BVTT3 x 6 screw from the top of the front panel assembly.
2. Remove the two BVTT3 x 6 screws from the bottom of the front panel assembly.
3. Carefully pull the front panel assembly away from the chassis.
How do I remove the bottom plate of the SONY STR-V25?
To remove the bottom plate, follow these steps in numerical order:
1. Remove the single PTPWH3 x 6 screw from the front underside.
2. Remove the two PTPWH3 x 6 screws from the rear underside.
3. Remove the single PTPWH3 x 6 screw from the middle underside.
4. Lift the bottom plate off the unit.
How do I perform the dial cord stringing procedure for the SONY STR-V25?
To string the dial cord on the SONY STR-V25, follow these steps:
1. Turn the tuning capacitor shaft fully clockwise, and set the dial drum to the position as illustrated in the service manual.
2. Hook the spring to the boss on the dial drum.
3. Wind the cord around the dial drum for two and a half turns.
4. Wind the cord around the dial drum for one turn.
5. Wind the cord around the dial drum for another two and a half turns.
6. Route the cord around the pulleys and flywheel assembly, stringing it below the lead wires and through the dial pointer guide as shown in the service manual diagram.
7. After stringing, apply a suitable locking compound to secure the cord.
8. Receive a broadcasting-station signal and set the dial pointer to the correct frequency of the station on the dial scale.
How do I perform the FM Discriminator Alignment 1 on the SONY STR-V25?
This procedure requires a VOM (Volt-Ohm-Meter).
Setting:
MODE switch: MONO
Procedure:
1. Detune the set.
2. Connect the VOM (range: 2.5 V dc) to pins 7 and ground of IC801.
3. Adjust the red core (primary-side) of IFT801 for 0 V dc reading on the VOM.
Note: Repeat the secondary-side and primary-side adjustments several times.
How do I perform the FM Discriminator Alignment 2 on the SONY STR-V25?
This procedure requires an FM RF signal generator and a distortion meter.
Setting:
MODE switch: MONO
Connect the FM RF signal generator to the FM antenna terminal. Connect the REC OUT of the receiver to the distortion meter with a 0.01 µF capacitor in line.
Carrier frequency: 98 MHz
Output level: 1 mV (60 dB)
Modulation: 400 Hz, 75 kHz deviation (100%)
Procedure:
Adjust the black core (secondary side) of IFT801 for minimum distortion.
How do I perform the VCO Adjustment on the SONY STR-V25?
There are two methods for VCO adjustment on the SONY STR-V25.
A) Regular Method (requires FM RF signal generator and frequency counter):
1. Set the MODE switch to MONO.
2. Connect the signal generator to the FM antenna terminal. Set it to 98 MHz, 400 Hz modulation with 75 kHz deviation, and an output level of 1 mV (60 dB).
3. Connect the frequency counter with a 100 kΩ resistor in series to pin 9 of IC101.
4. Tune the set to 98 MHz.
5. Adjust RT101 for a reading of 76 kHz ± 100 Hz on the counter.
B) Simple Method:
1. Tune the set to an FM stereo broadcasting signal.
2. Turn RT101 clockwise or counterclockwise and note the range over which the stereo lamp lights up.
3. Secure RT101 at the center of the lighting-up range.
How do I perform the Signal Indicator Level Adjustment on the SONY STR-V25?
This procedure requires an FM RF signal generator.
Setup:
MODE switch: MONO
Connect the signal generator to the FM antenna terminal.
Carrier frequency: 98 MHz
Modulation: 400 Hz, 75 kHz deviation (100%)
Output level: 1 mV (60 dB)
Procedure:
Tune the set to 98 MHz and adjust RT802 so that all signal elements light up.
How do I perform the FM Stereo Separation Adjustment on the SONY STR-V25?
This procedure requires an FM stereo signal generator and a VTVM (Vacuum Tube Voltmeter).
Setting:
MODE switch: STEREO
MUTING switch: ON
Connect the generator to the FM antenna terminal. Connect the VTVM to the REC OUT terminal.
Carrier frequency: 98 MHz
Output level: 1 mV (60 dB)
Modulation: Audio (400 Hz): 33.75 kHz deviation (45%), Pilot (19 kHz): 7.5 kHz deviation (10%)
Procedure:
1. For L-CH Stereo separation, set the generator output to L-CH and connect the VTVM to the L-CH output. Note the reading (A).
2. Keep the generator on L-CH, but connect the VTVM to the R-CH output. Adjust RT102 for the minimum reading.
3. For R-CH Stereo separation, set the generator output to R-CH and connect the VTVM to the R-CH output. Note the reading (B).
4. Keep the generator on R-CH, but connect the VTVM to the L-CH output. Adjust RT102 for the minimum reading.
The separations of both channels should be equal.
How do I perform the FM Muting Level Adjustment on the SONY STR-V25?
This procedure requires an FM RF signal generator and a VOM.
Setting:
MODE switch: STEREO
MUTING switch: ON
Connect the generator to the FM antenna terminal. Connect the VOM (ac range) to the REC OUT terminal.
Carrier frequency: 98 MHz
Modulation: 400 Hz, 75 kHz deviation (100%)
Output level: 10 µV (20 dB)
Procedure:
1. Tune the set to 98 MHz.
2. Turn RT801 and stop it just when the VOM indication suddenly decreases.
3. Receive a signal stronger than the muting level. Confirm that the ACUTE SERVO LOCK lamp (green) lights up.
How do I perform the DC Balance Adjustment on the SONY STR-V25?
This adjustment should be performed with no signal input, about five minutes after the POWER switch is turned ON.
1. Connect a VOM (dc range) across the SPEAKER L-CH (or R-CH) terminals with an 8 Ω load resistor.
2. Adjust RT602 (L-CH) and RT652 (R-CH) for a 0V dc reading on the VOM for each respective channel.
3. Repeat the DC bias and DC balance adjustments two or three times for accuracy.
How do I perform the DC Bias Adjustment on the SONY STR-V25?
This adjustment should be performed with no signal input, about five minutes after the POWER switch is turned ON.
1. Connect a VOM (dc range) to the test points indicated on the power amp board for the L-CH.
2. Adjust RT601 for a 20mV dc reading on the VOM.
3. Repeat for the R-CH by connecting the VOM to the corresponding test points and adjusting RT651 for a 20mV dc reading.
4. Repeat the DC bias and DC balance adjustments two or three times for accuracy.
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