Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Pooge the DH200 revisited.

209.48.140.10

Posted by Mark Kaepplein on June 14, 2000 at 12:38:59

In Reply to: Pooge the DH200 revisited. posted by David_toatley on June 13, 2000 at 19:08:59:

I have a DH500 that's gone through many modifications. It now has replacement circuit boards from Musical Concepts/Musical Design (www.musicaldesign.com). All in all, I have spent probably far too much time and money than the thing was worth. My suggestion is to stay with the more modest amounts of modification due to some issues:

1. Its 15-20 years old and the electrolytics are near the end of their lifespan. The main power supply ones will cost some $$.
2. The MOSFets are of the type more likely to sound "hazy" according to Stan Warren.

So, simple mods:
1. replace the input blocking capacitor with a piece of wire, DC coupling it.
2. Replace the electrolytic in the feedback network with a larger capacitance (deeper bass) and a better type (Black Gate).
3. Replace the onboard electrolytic power supply caps with larger valued low ESR types (ie Panasonic FA types from Digikey) and bypass with metalized Polypropelene film caps (.47uf to 2uf, 100v) that will fit well. An inexpensive one like Solen is fine.

Stop.

Just these three things should result in much better sound quality and perhaps only $30 spent.

If you want to live a little dangerously, increase the bias current 20%. More dangerous is to eliminate the fuse protection of speaker and power supply rail fuses. Keep the 115v AC fuse.

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