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Old 2nd April 2013, 01:24 AM   #1971
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Quote:
Originally Posted by analog_sa View Post
Yes. With 10k in parallel to the original resistors offset is now a few mV. As Salas mentioned in an earlier post during power on and off this goes off the scale, so a muting relay with a slow on, fast off is required.
Which resistors? 43a AND b for servo?
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Old 2nd April 2013, 01:25 AM   #1972
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normal, according to my measurements. just be careful with those DC-coupled 1kW subwoofers
Guess what my system looks like....... (Currently building a dcb1 as preamp)
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Old 2nd April 2013, 01:12 PM   #1973
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Listening the first time... far too early for a verdict but so far very nice. Detailed and exact but not at all overly analytic or harsh. I have to resist the temptation to make it louder. And then louder.

Servo voltage came down to 4/6 Volts after implementing the "real" RIAA network. Output offset still wanders a bit within 100mV but I decided to not worry about it (and switch on the power amps last).

I had to move the PS aways from the ampifier and now its surprisingly quiet even with no ground from the TT connected.

There could be a bit more gain - right now I'm using the nCores but I suspect when I use my belowed F4s I will not have enough gain. I'll worry about that later...

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Old 2nd April 2013, 03:35 PM   #1974
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Have you tried the Servo Authority Resistors to reduce to 10kOhm ?
Also you can build a little paper box and thermo couple the input transistors by encasing them
This measures should bring the DC offset down to less then 5mV.
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Old 2nd April 2013, 04:32 PM   #1975
Salas is offline Salas  Greece
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Quote:
Originally Posted by studiostevus View Post
Guess what my system looks like....... (Currently building a dcb1 as preamp)
Use AC coupling somewhere in the chain when with DCB1 and DC prone at times source. If the amp has an input cap already your speakers are safe.
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Old 2nd April 2013, 04:39 PM   #1976
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Originally Posted by Abraxas336 View Post
I have to resist the temptation to make it louder. And then louder.
I had a Deja vu with it, reminded me a Nak on Dolby C for tone overall.

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Old 2nd April 2013, 04:41 PM   #1977
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So, Salas, you have heard the Paradise ?
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Old 2nd April 2013, 04:48 PM   #1978
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A little on makeshift hook up. Common central raw PSU is ruled out, it really needs double mono. I preferred the flattened EQ. Its tame enough for transimpendance BJT. Its center of gravity is mid bass I guess. More like an easy force kind of sound. Not that spectacular but reliable. Like a good deck on Dolby C allegorically.
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Old 2nd April 2013, 05:25 PM   #1979
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I wonder - is that a compliment?

Thanks for the comments Gerhard. I have not experimented with servo authority or thermal coupling yet, will try that when I assemble the preamp in a case.

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Sven
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Old 2nd April 2013, 05:30 PM   #1980
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Yes, its a non pretentious, not harsh, low THD sound. Can replay many records without tilting over the edge. Can be played loud. Not being digital it reminds good quiet tape than reminding FLAC.
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