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Reed
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Last seen: 1 month 4 days ago
Joined: Sep 6 2005 - 5:37am
Amplifier Mods

I have recently purchased a HIGHLY modified Hafler DH200 amplifier, just for kicks. It has a new power transformer(not the origional type), circuit board, Cardas copper binding posts, Blackgate capacitors totally throughout (yes, even the big can ones), plus many other extras. I was able to select the upgrades that I wanted.

I was was shocked by what I heard. It is now my amplifier of choice in my system. I could spend thousands more, and I still doubt that it would match this little jewel. I'm now thinking of sending other components for upgrades, something I would have never considered before.

I was wondering about the opinions and experiences of other audiophiles regarding this area. I know it is a scary endeaver and an easy opportunity to get screwed, but I could not be happier with the results. I simply cannot explain how incredible this amplifier sounds, and it is not even completely broken in.

300Binary
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Re: Amplifier Mods

In between the folks who think amplifier designers are ordained and the engineers who are amazed anything still works after the accountants finish their cost benefit analysis is the piece of equipment on your shelf. Yes, it can be improved. Power supplies are the most expensive subsystem. Also the most important. Life ain't fair

If you like Black Gates, wait until you hear oil caps.

commsysman
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Re: Amplifier Mods

If you do not yet have the TRT DYNAMICAPS as your amplifier input coupling capacitors, you should get them and install them ASAP. I guarantee they will make a sonic improvement that will enthrall you; a revolutionary product. I just put them in my power amp and the output stage of my preamp, and the result was just thrilling; sonic purity in spades!!!
Parts Connexion in Canada has them as does Micheal Percy in California.

JoeE SP9
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Joined: Oct 31 2005 - 6:02pm
Re: Amplifier Mods

I have mentioned this on another thread. The critical sound of capacitors.
I have 2 Hafler DH200's and a Adcom GFA545 that I have modified this way. They sound better than anything I could otherwise afford. Changing the resistors to Vishays went a long way towards lowering the noise floor.

eagle
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Re: Amplifier Mods


Quote:
If you do not yet have the TRT DYNAMICAPS as your amplifier input coupling capacitors, you should get them and install them ASAP. I guarantee they will make a sonic improvement that will enthrall you; a revolutionary product. I just put them in my power amp and the output stage of my preamp, and the result was just thrilling; sonic purity in spades!!!
Parts Connexion in Canada has them as does Micheal Percy in California.

A customer gave me his Moscode 300, as he couldn't find anyone who could fix it. I sold him an Aragon 2002.

Within a week I'd found George Kaye on the internet and sent the amp off to him. (This was in the very early days of the internet.) For $299 he repaired it and did some minor mods. Later on, I replaced the one piece bridge rectifier with four discrete high speed diodes. What a difference.

It's still my main amp. I think I'll try some of these caps in it. And maybe I can replace the main power supply caps with higher capacity caps that fit in the same space.

Oh, there is a buzz in both channels now. I think it's a cold solder joint in the rectifier. I'll be looking into that soon.

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