Vintage BGW Model 250-B Power Amplifier 100W x 2 Channels - $250 (Manassas)

Vintage BGW Model 250-B Power Amplifier 100W x 2 Channels 1

Vintage BGW Model 250-B Power Amplifier 100W x 2 Channels 1 thumbnail

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condition: good

make / manufacturer: BGW

model name / number: Model 250-B

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This listing is for a vintage BGW Model 250-B Stereo/Mono Power Amplifier - a highly regarded Class AB amplifier known for its robust build and clean power. 100W x 2 channels. There are some scratches from use and age but it is in working condition. The power cord was recently replaced. Comes with printed owners manual. Selling as-is based on the fact that this unit is over 50 years old! All sales are final.

I also have a BGW Model 250 Power Amplifier for sale! It delivers 85W x 2 channels and would pair well with the Model 250-B!

Key Features:

* Class AB operation: For a balance of efficiency and audio fidelity.
* Robust build: Known for their durability and "pro audio" reliability.
* Full complementary output stage: Featuring multiple high-wattage transistors per channel.
* Magnetic circuit breaker protection.
* Error-sensing op-amp input stage and heat sink mounted bias circuit for stable and precise performance.

Power Output:

* Stereo (8Ω): 100 watts per channel (continuous average power, 20Hz-20kHz)
* Stereo (4Ω): 126 watts per channel (continuous average power, 20Hz-20kHz)
* Bridged Mono (8Ω): 251 watts (continuous average power, 20Hz-20kHz)

Audio Performance:

* Frequency Response: 20Hz to 20kHz (+0, -0.25dB), extending to 1Hz to 100kHz (+0, -3dB)
* Total Harmonic Distortion (THD):
* 0.1% max at any power level from 250mW to rated output (8Ω)
* 0.15% max at any power level from 250mW to rated output (4Ω and Bridged Mono)
* Intermodulation Distortion (IMD): Less than 0.1% (60Hz & 7kHz, 4:1)
* Signal-to-Noise Ratio (SNR): Better than 106dB below rated output (unweighted, 20Hz-20kHz)
* Damping Factor: Greater than 230 to 1 at 8Ω and 1kHz
* Input Sensitivity: 1.4V for rated output
* Gain: 26 dB (20 times)
* Input Impedance: 15k ohms (some sources mention 47k ohms for earlier 250 models, but 15k is common for the 250b series)
* DC Offset Voltage: Less than 10 millivolts (at output terminals)

Physical and Electrical:

* Dimensions: 133 x 483 x 298 mm (5.25" H x 19" W x 11.75" D)
* Weight: 11.2 kg (24.7 lbs)
* Speaker Load Impedance: Designed for any load impedance equal to or greater than 4Ω (minimum)
* Power Requirements: 100, 120, 200, 220, or 240 volts AC, 50-60Hz (560 watts maximum)
* Semiconductor Complement: Typically includes 2 Op Amp ICs, 31 transistors (some sources say 30), 6 zener diodes, 18 diodes, and 3 LEDs.

post id: 7877323449

posted: 2025-08-28 16:39

updated: 2025-09-27 11:25

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