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Old 6th October 2010, 08:44 PM   #2101
Salas is online now Salas  Greece
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Tell us you use V class from the start! That is why your offset is a bit. Same % DVM accuracy matching in them VS a BL means more gross difference. Its OK for 2SK170V. Use 10K log if you can with your sources Zo. 10VDC is my recommended ballpark, why you wanna go 11? Nice to see your links in a while, and learn more when in final system. Congrats.
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Old 6th October 2010, 08:55 PM   #2102
Atilla is offline Atilla  Norway
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Oh sorry for not mentioning that I've got high IDSS ones before, I totally forgot

I've no specific reason other than the THD vs Supply voltage graphs from the original B1 thread - someone played with that there and posted the results. It doesn't really matter to me as long as I'm over 9v per rail, really.

And as far as my listening session went - it sings . It definitely gives more life to my system and I can't wait to put it in a box and enjoy it properly.
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Old 6th October 2010, 09:00 PM   #2103
Salas is online now Salas  Greece
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That someone looking for a sweet spot maybe was me. Maybe another one again, I don't follow it much. Listen to some, you got another Idss, maybe a better spot to find.
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Old 7th October 2010, 09:40 AM   #2104
AndrewT is offline AndrewT  Scotland
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the sweet spot voltage for a Vgrade could well be different to a BLgrade.

I suspect it could be at a lower voltage, or the same as Salas found, or higher.
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Old 7th October 2010, 10:15 AM   #2105
Atilla is offline Atilla  Norway
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Quote:
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the sweet spot voltage for a Vgrade could well be different to a BLgrade.

I suspect it could be at a lower voltage, or the same as Salas found, or higher.
I wish I could run a distortion analyser and a lab power supply, in order to experiment, but I'm afraid I'll just have to base it on my ears.
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Old 7th October 2010, 07:04 PM   #2106
Atilla is offline Atilla  Norway
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I got the voltages to +-11.17, kind of accidentally similar. As I said, it's hard to know without proper measurements, but if anything - it definitely doesn't sound worse. I lost a small amount of DC offset, not enough to matter and totally by accident.

The "Do my neighbours hate me yet" test says it all though - with the DCB1 I don't lose any detail at glass-shattering volumes. That makes me very very happy indeed. It's a clear step forward from what I used to have.

I also mounted the heatsinks properly, with some good thermal grease. They're nowhere close to being hot and they're tempting me to parallel another 51r at the last position No, no - I promise, it's going in the box now, no more soldering for this board!
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Old 7th October 2010, 07:51 PM   #2107
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Quote:
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the sweet spot voltage for a Vgrade could well be different to a BLgrade.

I suspect it could be at a lower voltage, or the same as Salas found, or higher.
Hi Andrew

Would you happen to know if the LSK has a different sweet spot to the 2SK?
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Old 8th October 2010, 09:03 AM   #2108
AndrewT is offline AndrewT  Scotland
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Sorry Trip, I don't know.

I found it impossible to tell if adding the DCB1 made any difference to the overall sound output.
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Old 8th October 2010, 08:26 PM   #2109
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Sorry Trip, I don't know.

I found it impossible to tell if adding the DCB1 made any difference to the overall sound output.
Thanks Ange
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Old 9th October 2010, 12:12 PM   #2110
Malka07 is offline Malka07  England
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Default DCB1 UPDATE

A few days ago, i replaced the CCS resistors with Mills MRA-12 resistors.

2.09v/3.9ohm= 535ma
1.73v/3.5ohm= 494ma

I was previously running at about 350ma....

Well as expected once again i get an improvement in SQ

The soundstage seems huge on certain recordings, each musician is more easily decernable and can be followed with ease(good seperation) yet they gel and sound very musical. The bass also has gained weight and control and as a result also sounds musical...but the real supprise for me is the treble...Just easier to hear, and REAL sounding!! Adds alot to the experience.

I checked the heat of the mosfets after an hour of listening...fan running at 5v...the mosfets are now hot, but not burning...im easily able to hold my finger on them without having to move away.

HIGHLY RECOMMENDED...especially for those with the Blue Boards.

Alon
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