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In Reply to: RE: And more better posted by Ralph on May 16, 2012 at 08:31:56
Why, I wondered, do they use that series resistor? I had a hunch it is to create a hi-pass filter in combination with a parallel capacitance, but why choose such a hi-value R, when it might be more efficient to use a lo-value R and a correspondingly higher value of C? If you selected a 15K resistor, would you then also halve the value of the R in series with the input of the pos half of the drive signal? (It's 33K, I think. Did not consult the schematic.) Also, wouldn't you have to mess with the ground connections?
Follow Ups:
Yes, one of those things that the designer is not around to ask about. You shouldn't have to mess with grounding.
Rumors of his death are exaggerated, to paraphrase Mark Twain.
However, I have heard that he is reluctant to comment on this schematic. He sells upgrades to these amplifiers, or so it is said. In an interview with respect to the history of Beveridge speakers and the writing of a Harold Beveridge bio, Mr. Modjeski was reported to say that this was one of his very first designs and that he and Beveridge parted company very soon thereafter.
Perhaps I can draw up what I think you mean, and you can comment.
Lew an others
Maybe we can move back here....for other so if thay run into the SL mod in tiime... thay can get some info.... or what ever ...
To Me it looks like Jim got it right with Acoustat "befor c mod" as for geting the best output out of the high frc. tranfourmers
But i gess Dr. west an jim were facet with people needing to driver these ESL at full output...so this led to the C mod an the setup on the soundLabs.... like thay gave up the best sound for the most sound output..
look can any one give just a drawing of the SL setup
Some of the best sound so far with the Acoustats.. with this setup..the M60s do sound good..
the 60years old pr of Dynaco MK3s...with the Stock 60years old tubes 6550 GEs...an a 6AN8...this is sweet as honey...an it well drive you out of the room...it louad...best highs i have ever got out of any ESL to date...
So were looking at 6 days i had this mod in an i still have to get up in the morning an see if the sound is still there...may be the output tranfourmer on the MK3 match the tranfourmers in the Acoustats interfaces but it work great...Thanks for any input on geting good sound out of OTLs an ESL....goodluck
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