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Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 6th December 2018, 08:22 PM   #3341
alexkosha is offline alexkosha  United States
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Quote:
Originally Posted by mige0 View Post
looking forward to your findings and impressions


Would be very beneficial to measure classic vs. UltaBiB PSU and without vs. with decoupling using FFT like “before” and “after”. Otherwise, it is extremely subjective and intend to to turn to individuals psychoacoustics issue.
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Old 6th December 2018, 08:43 PM   #3342
Hikari1 is offline Hikari1  United States
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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.
I listened to this song via Spotify on DCG3 and AKG 272HD. My DCG3 has single 317/337 followed by cap multiplier though.

Bass was "wobbly". But I would have just assumed that's the way it was produced if someone had not told me otherwise.

Not sure if it's synth bass or a stringed bass. But it's hard to tell what's going on with the bass. I do have AKG KXX (702-like) at home as well.
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Old 7th December 2018, 12:11 AM   #3343
mige0 is offline mige0  Austria
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Quote:
Originally Posted by alexkosha View Post
Would be very beneficial to measure classic vs. UltaBiB PSU and without vs. with decoupling using FFT like “before” and “after”. Otherwise, it is extremely subjective and intend to to turn to individuals psychoacoustics issue.
One of the biggest hurdles in trying to objectify sound perception by measurements is that we don't have a detailed dictionary yet as to how one translates into the other.
Quite often we even don't have the words to describe a specific effect and are in need of analogies, others may or may not understand.

Unintended interaction between stages via power supply rail is extremely hard to measure too, as the frequencies of interest can be all over the place, down to very very low.

Best grip on the subject from my experience is, to look after power supply rejection ratio in SPICE and if not possible, just crank it up as high as any possible all through the audio band and even considerable below. This isn't any easy when pushed into the extremes.

Some of us are more listening to overtones, some are rather listening to the fundamentals as studies among musicians have shown. So perception of one and the same is quite different for different people.



Quote:
Originally Posted by Hikari1 View Post
Bass was "wobbly". But I would have just assumed that's the way it was produced if someone had not told me otherwise.
Most albums from Joni seem to be excellent in this regard, especially given the time they were recorded. My guess is that she was a person that was very after that bass lines creating "her" space to act in.

But don't concentrate on this song I gave as an example, simply look out for the same behaviour on your favourite records. Try the mod and see what it does for you might be the best prove.

Those who praised the upgrade to the UltraBiB did already show the way to go. I'm sure sonics of salas amp can be pushed even further. To me it seems to be an extra ordinary capable design of great beauty, rewarding quite any improvement of the power supply.


By the way, got the BC237-40 and was able to sort out a matched quad at hfe 520.
Will make the switch tomorrow.

Last edited by mige0; 7th December 2018 at 12:40 AM.
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Old 7th December 2018, 01:16 AM   #3344
Salas is offline Salas  Greece
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Joni was for agile song foundation too, she had some albums with Jaco Pastorius playing his trombone style bass lines at his best
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Old 7th December 2018, 08:06 PM   #3345
mige0 is offline mige0  Austria
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ohh, oh, oh, switching from BC560 to BC237-40 gives quite a remarkable gain in clear and focused sound, even down to the lowest department I'm so interested in.
Didn't need any break in, was apparent from the first notes. Great!
Might be, its partly synergistic with the tantal caps, haven't gone back and forth to sort this out.

Reverted to 100mA bias as the DCSG runs at temperatures I'm not really happy with in that open box I have for now.
Had no adverse effect as far as I can say by now.
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Old 7th December 2018, 08:18 PM   #3346
Salas is offline Salas  Greece
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