Question about HHB Radius 50 Tube Amplifier

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Stage 100 blowing fuse,loud hum - HHB Radius 50 Tube Amplifier

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If you are not a tech , take to someone who is please.

One or more output transistor has failed and is dumping DC voltage into your speaker. If that keeps up , it WILL cook the speaker

Posted on Dec 16, 2014

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Hi,If your blowing fuses then the problem is most likely to be faulty bridge rectifier or darlington output transistors.All readily available and not too expensive.Circuit diagram on Fender site or net easily found.Thanks Fender good customer service.

Posted on Jun 08, 2014

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Posted on Jan 02, 2017

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1 Answer

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If the low voltage fuse keeps blowing a short circuit exists somwhere in the low voltage wiring. The hummimg could be the transformer loose or possibly the motor.

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There are a few variants for this model depending upon the serial number. From your description, there are some capacitors in between the amp stages called coupling caps that are failing. The hum is some DC current being passed through the output stage. The crackling is probably just dirty controls.

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1 Answer

The power fuse blows as soon as the unit is plugged in


There is a problem with the amplifier within the sub. Many of these units never completely turn off. They are often set to automatically startup when a signal is detected. This may be the case here. The loud hum as a defect in the output amp section. At this point you probably have a blown amp section. The "protection" for this is to cause a dead short that will open up the fuse. This unit will require service. It is unlikely that any service info is availabel to the general public either.

The fix could be simple, but without seeing the unit, I can not state that for sure.

Keep us posted.
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The amp has a short in it. It is common that the output stage becomes damaged for various reasons on many of these amps. The output and driver stages will have to be serviced.

Most of these failures are from defective speakers loading the amp, or there is a short somewhere, or the amp was over-driven by being played much too loud.

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First,
Disconnect any input cables from the amp. Turn down the volume controls and disconnect the speakers. Power back on. If you still blow fuses with nothing hooked up, have the amp fixed.
If the fuse holds, shut down and connect the speakers, leaving the volume controls down. Power up and see if your fuse holds. If you have hum, an output transistor is most likely shorted. If you have no noise, SLOWLY turn up the volume controls and listen for the hum. If all is quiet, turn down the volume controls and connect your input cables and turn the volume back up. Noise? check your cables!
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have you checked your music source? Some systems like computers have a sort of output first before normalizing, which isn't your powered subs or powered amps problem. Try plugging in a regular solid state player like an ipod if the humming is still there when automatically turning on or off...

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