Nahash5150 10,955 Posted July 7, 2025 Posted July 7, 2025 A received a Hafler DH-220 to fix along with an extensive upgrade kit. It came with a USB drive with docs and pics. A well put together project. The unit was in dire need of service. Old, crusty, and very dirty. Top of unit: Near power switch and primary fuse: Taken apart: I removed most of the screws and derusted them, then cleaned and derusted the chassis, heat sinks and other various parts. It was a load of work! But it cleaned up pretty good. All new amp driver boards that had to be stuffed by hand. Crazy! New speaker binding posts and RCA jacks as well. It looks so much better now though: Sorry - forgot to snap a picture of it all put together. But here's an internet one: 3
Community Admin AndrewJohn 10,807 Posted July 9, 2025 Community Admin Posted July 9, 2025 Nice work, Greg. Can you share what you do to "de-rust"..., do you use mechanical or chemical derust techniques? My mother just gave me the old Fisher amp that I grew up with..., and she had it in her basement. My first look at it, and I realized the basement humidity had done a similar light rusting to your hafler... 1
Nahash5150 10,955 Posted July 16, 2025 Author Posted July 16, 2025 On 7/9/2025 at 2:40 PM, AndrewJohn said: Nice work, Greg. Can you share what you do to "de-rust"..., do you use mechanical or chemical derust techniques? My mother just gave me the old Fisher amp that I grew up with..., and she had it in her basement. My first look at it, and I realized the basement humidity had done a similar light rusting to your hafler... I used Krud Kutter - The Must for Rust solution 1
Benjaminsswanson 12 Posted January 23 Posted January 23 Nice! I have a DH500 and the RCA inputs are deteriorating on the inside. Occasionally I have to mess with the cables. I think as stage 1, I will give the insides a bit a of a clean and replace the RCA jacks. Which RCA jacks did you use for this one and did you have to open up the holes in the chassis at all? Thanks in advance. Grace and peace, Ben 1
Nahash5150 10,955 Posted February 1 Author Posted February 1 On 1/23/2026 at 12:15 PM, Benjaminsswanson said: Nice! I have a DH500 and the RCA inputs are deteriorating on the inside. Occasionally I have to mess with the cables. I think as stage 1, I will give the insides a bit a of a clean and replace the RCA jacks. Which RCA jacks did you use for this one and did you have to open up the holes in the chassis at all? Thanks in advance. Grace and peace, Ben I use these: https://www.mouser.com/ProductDetail/REAN/NYS367-0?qs=R5cXQUTKuHU8XkQYanQZXg%3D%3D The number after the dash selects the color. The above is black.
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