Question about Hartke B900 90-Watt Bass Combo Amp

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My hartke b900 doesnt have sound

During a jam session, I cranked the volume all the way up to compete with the guitarest and the sound cut out 15 min later. Once I arrived home to further inspect my unit, I noticed that the fuse was still intact. I pluged the head in and checked for voltage. Everything seamed to test positive except the line leading down to the speaker.

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Posted on Jan 02, 2017

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SOURCE: Hartke Ha2500 250watt Bass Amplifier Head sound

This sounds like the thermal protection is activating. Make sure the vents and heatsinks have FREE AIRFLOW. If the sound cycles on and off, it could be a failure of the heater in the one vacuum tube in the unit. The heater could cooll and reconnect and then heat and disconnect.

Posted on Nov 03, 2010

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SOURCE: after playing a a few

Maybe you are running high volume that is heating up the electronics and the thermal cutouts are shutting it down to avoid damaging the amplifier? Recommend you get a sound meter and check the sound level as you MAY be exceeding the safe level for hearing loss... I happen to know several near-deaf musicians who now cannot hear what they play. Search google for the safe levels. Back to the problem... Make sure you do use the compressor to PROTECT the speakers in this unit. Read the user's manual AND do NOT boost the bass with the EQ. Read the manual about this hazard to the speakers. It is LIKELY you are driving the amp to the point that a thermal cutout is tripping and then it has to cool down before allowing the amp to restart. The cool down time of 1-2 minutes would indicate this. Also make sure that the guitar cannot "hear" the amp or it MAY be sustaining regeneration causing excess power to sustain notes that you might not be aware of. Replacing speakers that are blown is expensive. You should avoid sound levels exceeding 95 DB when measured 6 foot in front of this. Look up the exposure limits of time for this level on google under SPL exposure limits. You can replace speakers and amps, but ears are not transplantable yet. With a deaf husband, he will be able to tolerate nagging to the max... think about the long term of deafness... it is no joke.

Posted on Sep 03, 2011

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