Hafler DH-500 Power Amp Repair III

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Hafler DH-500 Power Amp Repair III - Static Noise

Рет қаралды 1,490

Күн бұрын

This is a video about repairing a static noise for Hafler DH-500 power amplifier. It took me a while to figure out because there was no apparent cause or defective parts can be detected from my multi-meter or SG/Oscilloscope equipment. This unit was working fine but generated an annoying static noise. I started repairs by replacing electrolytic capacitors first. The noise was reduced but still there. It didn't completely go away until I replaced the driver transistor Q13. So I hope this video will help other DIY fan when dealing with the static noise in their amplifiers.

Пікірлер: 12

@craigm.9070 2 жыл бұрын

Thank you for sharing your troubleshooting! Sounds amazing now in the quiet, acoustic music sequences. Been a long time since I've seen the internal real estate of one of these...the good 'ol days!

@VintageAudioFan 2 жыл бұрын

Thank you for your comments.

@pascalphase2556 2 жыл бұрын

You're very patient to find out this static noise, bravo ! from France. Are you happy whith nichicon condensator ? personnaly i use panasonic, what do you think ?

@VintageAudioFan 2 жыл бұрын

I think Nichicon does improve the sound quality of the amp and I am impressed. I haven't tried Panasonic before. But I will try in the future. Thanks.

@joelane7146 2 жыл бұрын

Excellent video, sounds good!

@VintageAudioFan 2 жыл бұрын

Glad you like it!

@theirritatedirishman5440 2 жыл бұрын

How do think this amp would be with a good tube bass guitar preamp?

@VintageAudioFan 2 жыл бұрын

I haven't owned a tube bass preamp before so I can't give you any opinions. However, I used a Yamaha C-2 preamp in this video to do the listening test and it sounded very good.

@tofyvargashi-fi7326 Жыл бұрын

hello, could you help me, I have a hafler 500 and one channel sounds saturated, thanks for your help, greetings from Ecuador

@VintageAudioFan Жыл бұрын

There are some culprits are very common in this product. Also there are many versions in this product. So to give you suggestions, I need to know which version your unit belong to. You can send the photos of interior of your amplifier and PCB layout to my email which is listed under "About" in my KZfaq channel home page.