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Author Topic: Hafler DH-220  (Read 1217 times)

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Offline qguy

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Hafler DH-220
« on: Jan 26, 2018 at 01:48 AM »
Anyone has experience on this ? Is serviceability an issue ?   
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Offline rascal101

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Re: Hafler DH-220
« Reply #1 on: Jan 26, 2018 at 10:25 AM »
Owned this model for at least 2 years. So far did not encounter serviceability issues.

Issue is the input power being drawn. Needed a 1kV Stavol voltage regulator ... hehehe
« Last Edit: Jan 26, 2018 at 10:58 AM by rascal101 »
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Offline tony

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Re: Hafler DH-220
« Reply #2 on: Jan 26, 2018 at 12:09 PM »
i serviced one in the 90's it was called Hafler xl-280 ok naman, very well built at mosfets ang output...

being an old amp, recapping may be needed...
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Offline qguy

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Re: Hafler DH-220
« Reply #3 on: Jan 27, 2018 at 12:39 AM »
Thanks !!!
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Offline tony

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Re: Hafler DH-220
« Reply #4 on: Jan 27, 2018 at 07:50 AM »
mosfet output stages do not suffer the same failure mode as bipolars do...
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Offline JojoD818

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Re: Hafler DH-220
« Reply #5 on: Jan 27, 2018 at 02:15 PM »
^Secondary Breakdown

Not much of a problem nowadays. We have learned and gained so much in the past few decades that with the advancements in emitter-base junction techniques this is a thing in the past for BJTs. This can still happen though, with poor choice of devices.

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Offline tony

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Re: Hafler DH-220
« Reply #6 on: Jan 27, 2018 at 02:50 PM »
yes, just be mindful of the SOA curves.....
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Offline JojoD818

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Re: Hafler DH-220
« Reply #7 on: Jan 27, 2018 at 02:57 PM »
^There isn't much to worry about with today's devices. SOAR "perspiration" no more!

MJ2955/2N3055 days nakakatakot pa. ;D

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