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Agoraquest • View topic - Next up, the DVP-S7000. Yep, I'm at it again...

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View topic - Next up, the DVP-S7000. Yep, I'm at it again...

Next up, the DVP-S7000. Yep, I'm at it again...

This forum is where you can give tips or talk about building your own stuff

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by RickeyM » Tue Mar 15, 2011 6:17 am

Now if you really want to get serious about that bypass, install some poly caps  and use their leads to bridge the Op amp's outputs directly to a quality pair of real gold-plate contact RCA chassis jacks. I found a seller that has some oil-in-paper caps in a small form factor and installed these. These sound crystal clear with nice tight deep bass. The best I've tried there so far. I'll pull the board and snap a pic to show what I've done.
Those factory RCA jacks are definately low grade and the player will benifit from better ones.
 Earlier in this thread There's a pic showing some humongus Obbligato Copper caps. Even tough they were only 4.7uF, they're huge. The new OIP caps are much smaller and are 10uF.
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by RickeyM » Fri Mar 18, 2011 8:58 am

Tried a little experiment yesterday.  Recalling something from another forum had me wondering what would happen if the output coupling caps were removed altogether, so I gave it a shot. Wow! Better clarity, brighter highs deeper fuller bass. I'm definately going to give it a few days of listening before passing final judgement, but I'm liking it so far.


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[ This message was edited by: Ricke

yM on 2011-03-18 13:01 ]


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by S7000tweaker » Sun Mar 20, 2011 2:06 pm

Hmmm- I'll have to test for DC before I go direct from the Op-amps. Looking at the arrangement of resistors and caps that are used to strap the 2 halves of the 2nd Op-amp together it doesn't look like any particular scheme to eliminate DC... I assume that's the point of the coupling caps. Seems the bean-counters would eliminate any such costly caps if they weren't providing any benefit; but certainly worth a look. Can't say I would want any further brightness however! early 80's CD's are already strident enough- modern ones are just right.

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by RickeyM » Mon Mar 21, 2011 9:08 pm

I'll check the DC offset on mine as soon as I get the chance too. Maybe brighter was the wrong word. It's more like clearer and more extended. Man, I would LOVE to hear this player through a tube pre-amp. I think it may be time to sell off the MMG's , hehe.

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by jehill » Wed Mar 23, 2011 2:04 pm

Quite often, input and output capacitors are there simply to protect a component from external voltages.  This can result in the output capacitors of one component being connected to the input capacitors of the next component.  I removed the output capacitors from my Bose 901 equalizer when I had it connected to my home built amps that that utilized a DC input.  It can make a huge difference.  Just be sure that there is no DC offset!
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by Maxxwire » Sat Apr 02, 2011 1:31 pm


On 2011-03-22 01:08, RickeyM wrote:
Maybe brighter was the wrong word. It's more like clearer and more extended. Man, I would LOVE to hear this player through a tube pre-amp. I think it may be time to sell off the MMG's , hehe.




Many seasoned listeners who prefer a clearer and more extend sound to their Music use a hybrid Tube/FET Preamp which only requires 1 or 2 Tubes in the line stage as compared to the 6-10 Tubes required in an all Tube Preamp which is a great advantage considering the cost of Old Stock Vacuum Tubes these days. I was at my Tech's shop one day and he was working on a Tube/FET Preamp and he told me that he was very familiar with that design because the Preamps that he was building for Dan Wright at the time were also hybrid Tube/FET design...



The ModWright LS-36.5 Tube/FET Preamp




What makes this design to work so well is that when used in the same gain stage the  amplification characteristics of the Transistor and Tube cancel out each other out to produce a linear amplification curve. In my own listening experience Tube/FET Preamps make all Tube designs sound muddy by comparison.

The good news is that you wouldn't have to sell your Maggies to if you decided you wanted to get a Tube/FET preamp. A pre-owned Michael Elliot Counterpoint Tube/FET Preamp can be had for a few $100 and his website is filled with Modification suggestions that you might enjoy checking out

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by RickeyM » Tue Apr 05, 2011 6:15 am

I'll put that on the "short list" ;^)  Don't worry it's the MMG's that'll be going on the block, not the MG-2.5R's. I found instructions on how to bias the Op-amps into Class-A operation so I guess it's time to heat up the "iron" again. I'll report back on the results.
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