Elizabeth makes some very valid points. Just for a tech to look over an amp by me is now $60 to $75 depending on the equipment. Then after all their work they could be into you for hundreds and if you were to sell the DH500 you would lose out. Musical Concepts is a whole other story. I once had a Hafler XL280 that was modded by them and the music was really nice.
Now when I had the Hafler DH-500 one thing I did was clean the insides of it. The fan inside the DH-500 will bring all sorts of dust into it. I bought some cleaners from Radioshack and sprayed the boards. The speaker terminals and IC posts were sprayed with DeOxit. I vacuumed what I could with a small vacuum cleaner.
On a popular auction site if you search for Hafler of Hafler DH you will find repair kits that aren't too much money. There were replacement Power Supply caps for $50 that looked pretty easy to install.
Also the looks of the DH-500 are on point with what Paul_graham said. The green color scheme and looks of the DH-500s are really military like. Drab and all business. Nothing pretty at all except for the sound. All in all I wish I still had a DH-500.
Now when I had the Hafler DH-500 one thing I did was clean the insides of it. The fan inside the DH-500 will bring all sorts of dust into it. I bought some cleaners from Radioshack and sprayed the boards. The speaker terminals and IC posts were sprayed with DeOxit. I vacuumed what I could with a small vacuum cleaner.
On a popular auction site if you search for Hafler of Hafler DH you will find repair kits that aren't too much money. There were replacement Power Supply caps for $50 that looked pretty easy to install.
Also the looks of the DH-500 are on point with what Paul_graham said. The green color scheme and looks of the DH-500s are really military like. Drab and all business. Nothing pretty at all except for the sound. All in all I wish I still had a DH-500.