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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 4th December 2018, 09:51 PM   #3331
mige0 is offline mige0  Austria
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Thanks.
Order was already placed, but will take its time. Have to be patient

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Maybe due to much less 1/F noise vs 560s there is characteristically good bass definition with the 327-40s in this circuit.
Definition is really ok for the time beeing, its the whole acoustic painting that gets wobbled.
From my experience its not a break in issue but most likely a PS issue.
Speaking of paintings, the colours of the DCG3 on the K712 are as saturated as been painted by Rembrandt himself. Like it!


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It's good for THD when with below 80 Ohm cans anyway.
I have read about it, but wanted to try 100mA first, to get a grip on that instance as well.

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soon to be replaced by an OPA 2209 anyway
sorry mixed it up, the OPA1622 was meant as headphone driver replacement of course.
The OPA2209 will replace the inferior NE5532's in the TEAC

Last edited by mige0; 4th December 2018 at 09:59 PM.
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Old 4th December 2018, 10:12 PM   #3332
Salas is online now Salas  Greece
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Salas DCG3 preamp (line & headphone)
Have you got other cans handy to see again about picture wobble during heavy lines? I don't think I can recall that with the K712s on the DCG3+DCSTB but I don't have them in hand anymore as they are a friend's
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Old 4th December 2018, 10:57 PM   #3333
mige0 is offline mige0  Austria
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Not by now, sadly. The K701 I have is of the same impedance and sensitivity and I would have to solder a 4-pin mini-XLR first.

Last edited by mige0; 4th December 2018 at 11:00 PM.
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Old 5th December 2018, 08:22 PM   #3334
mige0 is offline mige0  Austria
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I cranked the bias up to 150mA but it didn't yield any fundamental improvement.
The RC decoupling of the first stage did the trick, though.

If one happens to like Joni Mitchell's style for example, there are many songs that very much relay on heavy bass lines to establish an extreme wide and deep frame of acoustic space. If the bottom register gets wobbly, theses songs do not work at all.

Really looking forward to the split +voltage PS mod with the UltraBiBs to come!

I like tantals and I like them even more when paralleled with MKT (+100nF) and silver MICA (+100pF). The negative is wired straight to my close focus quasi star mass.
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Last edited by mige0; 5th December 2018 at 08:39 PM.
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Old 5th December 2018, 09:21 PM   #3335
Salas is online now Salas  Greece
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Tell me a song you spotted that wobble with, I will try listen for it since my build is stock 100mA except I changed from BC560s to BC327s Q1 Q2 mirror. I have enough different cans around here, open and closed type from 32 Ohm to 600 Ohm.
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Old 5th December 2018, 11:00 PM   #3336
mige0 is offline mige0  Austria
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"Love Puts On A New Face" on the "Taming the Tiger" album for example.
You can take almost any song from the 70 / 80ies recordings. Joni Mitchell seemed to have had a very strong and intimate almost tribal connection to such bass lines spreading out into eternity, which is rather unusual for a female singer IMO. It came to me when I recently rediscovered Joni for me.

Even better probably would be, to try this simple mod and have a look what it can do to the favourite recordings of yours you may know well. Despite your aversion to tantals I'd suggest you to use them here for once, as IMO no other lytic comes close regarding stiff and stringent bass.
Effect should be even more pronounced with a split PS, as RC decoupling has rather limited isolation at the very bottom end of course.

Will be fun once I get there.

Last edited by mige0; 5th December 2018 at 11:07 PM.
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Old 6th December 2018, 07:56 AM   #3337
Salas is online now Salas  Greece
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Will listen to as soon as able. For AKG I have K612 Pro in hand. I would rather go directly Ultrabibs than RC if after the best LF rock steadyness though. Solving super low Z at the voltage source than splitting the load.
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Old 6th December 2018, 01:04 PM   #3338
mige0 is offline mige0  Austria
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Try your K701 as well, as this is very revealing regarding three-dimensionality due to its stock 4-wire cable. Though tantals need less break in time than other lytics from my experience, a day or two would be good to wait before final judgement
Sure low Z of the UBiB should be most beneficial, but split PS even for UBiB may pay out. Will see.

For those that don't want to step up to UltraBiB for one reason or another, the RC decoupling mod may be a mod well worth in my opinion. It also helps in sharpening the focus throughout the audio bandwidth, increasing separation and body of singers and instruments as far as I can tell by now.

Last edited by mige0; 6th December 2018 at 01:23 PM.
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Old 6th December 2018, 01:24 PM   #3339
Salas is online now Salas  Greece
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I will listen for wobble first in the specific song. For K701 I have quick access but I have HD600 with split cable feed as well.
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Old 6th December 2018, 07:08 PM   #3340
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looking forward to your findings and impressions
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