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288 Monaural Amplifier

Owner

’

s Manual

www.bandwidthaudio.com

[email protected]

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Содержание 288

Страница 1: ...288 Monaural Amplifier Owner s Manual www bandwidthaudio com sales bandwidthaudio com...

Страница 2: ...d and not in use Do not remove the back cover unless you are a qualified service technician For service contact Bandwidth Audio High Vacuum Tube Temperatures Vacuum tubes get extremely hot with bulb t...

Страница 3: ...e powering on See Section 3 3 Biasing 1 1 Amplifier Placement For the best operation and longest life of components the amplifier should be set up and used in a well ventilated area with good air circ...

Страница 4: ...fier illuminates when powered on Tube warm up time is typically 30 seconds It will take at least this long for music to play from speakers Best performance is achieved after the amplifier has been run...

Страница 5: ...the input signal Rather than a normal rotational potentiometer a stepped attenuator is used A stepped attenuator eliminates noise during rotation and also maintains volume balance between a pair of a...

Страница 6: ...power rated at approximately 60 Watts of output power when it is indicating 0dB Driving the output beyond this region will cause amplifier distortion Although this is not harmful to the amp there is...

Страница 7: ...voltage indicated on the serial number tag below the mains input 5 Mains Fuse Use only 2 5 Amp Slow Blow Fuse This fuse is in series with the mains current to protect the user and amplifier from vario...

Страница 8: ...the power tubes See Section 3 3 Biasing 9 Hum Balance Screwdriver adjustable potentiometer that references the preamp tube filaments above voltage ground to lower the AC filament noise This is usuall...

Страница 9: ...the base of the tube rather than the glass Match the keyway in the tube socket with the key in the tube and install with a slight and gentle circular rocking motion until the tube is fully seated aga...

Страница 10: ...rectifiers only need to be replaced when they fail There is no need for regular change unless reliability is a concern or the amplifier has seen a lot of vibration from transportation Moving the amps...

Страница 11: ...down the bias should be set between 60 65mA To adjust use the screwdriver adjustment potentiometer labeled Bias on the back of the amplifier This range is based on sound preference as well as desired...

Страница 12: ...ct the power tubes can last longer However distortion will rise steeply causing significant distortion figures less power and bad sound Running the amplifier with a bias setting over 53mA will decreas...

Страница 13: ...t 0 5dB THD N at 1 Watt 1KHz 0 035 1 Watt Bandwidth 13Hz 50KHz at 0 5dB Input Voltage for Rated Output 1 7V RMS SNR 1 Watt into 8ohms 600 ohms source impedance volume set to maximum 93dB A Weighted SN...

Страница 14: ...ifier Rev 1 2 14 Speaker Taps 4 8 16 ohms Power Tubes 2x KT88 Preamp Tubes 2x 6SN7 Rectifier Tube GZ34 Power Consumption 150 Watts Dimensions 20 x 13 x 9 5 Actual performance will vary depending on va...

Страница 15: ...____________ Bias Current V3______________ V4_____________ Notes ___________________________________________________________________________________ ___________________________________________________...

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