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Stormrider Stormrider is offline

diyAudio Member

About Me

  • About Stormrider
    Biography
    23yr old from CT
    Location
    Connecticut
    Interests
    Speakerbuilding, cars
    Occupation
    Electronics tech
    Country
    United States
    Real Name
    R. Johnson
  • Signature
    AJ

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Wiki
General Information
  • Last Activity: 20th November 2014 01:09 AM
  • Join Date: 13th April 2006

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Blog

Latest Blog Entry

Posted 16th April 2013 at 10:57 PM by Stormrider Comments 2
Posted in Uncategorized
Where was I? Right, back to the workshop and cue the music.

Sorry in advance for my photos. They get the job done, but some of them look pretty bad now. I'd retake them but the amp has long since been returned to it's owner.

Once both channels were running happily with their new parts on the benchtop power supply I turned my limited attention to the chassis. The phenolic insulators sandwiching the RCA jacks in place were starting to crumble so, some shiny new jacks were fitted courtesy of ApexJr.com for 99 cents. The input wiring was done with 22AWG shielded wire.



The pro Hafler models like the P125 and the P230 have a solid aluminum bracket for the ground connections between the main power supply caps. The DH200 and DH220 models only got some tinned wire which isn't very convenient or nice looking. I fashioned up a new bracket with some scrap...

Posted 11th December 2012 at 12:42 AM by Stormrider Comments 4
Posted in Uncategorized
Doctor, Doctor

David Hafler (RIP) must have sold tons of these amps... There are always a wide selection of different models on ebay, but the DH200 and DH220 seem to be the most common. I have three of my own (2 P230's and a P125) that I cycle in and out of use. I've repaired and rebuilt several for other people, and yet I keep running into more of them. The most recent being Brokencrank's DH200, which I have documented below for reference, and to have a place to put my notes. I don't claim any of the info below to be gospel, just my experience. I also don't claim this to be a step by step guide to resuscitate your old Hafler. A basic understanding of electronics and amplifiers will be required. Know what you're doing before you do it, and you will make less mistakes. If you have questions, ask!*

Note: All of the component reference numbers (ie. R3, C14, Q10, etc...) I mention will be based on the schematics available in the manuals at Hafler.com. Because...
Recent Comments
Quote:
Originally Posted by DonA
Ummmmm.... I know
...
Posted 22nd May 2014 at 12:36 PM by Stormrider Stormrider is offline
Ummmmm.... I know...
Posted 22nd May 2014 at 02:45 AM by DonA DonA is offline
This was helpful,I have...
Posted 10th April 2014 at 05:13 PM by KTnC KTnC is offline
Thanks for the info,...
Posted 19th January 2014 at 02:00 AM by Rjones5296 Rjones5296 is offline
Quote:
Originally Posted by Renron
Hard to believe that
...
Posted 31st December 2012 at 12:48 PM by Stormrider Stormrider is offline
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