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Old 8th August 2014, 12:53 PM   #21
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Originally Posted by Russ White View Post
The latest iteration of the Placid BP is a must have for either the IVY or the Legato. This last iteration has the benefit of exceptional user feedback which has influenced its final form. It has taken the supply to a new level in terms of low noise and low output impedance. The difference it makes in an output stage can be stunning.
The magic words... I ordered both Placids to replace the old ones of my BIIISE.
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Old 8th August 2014, 03:03 PM   #22
sbelyo is offline sbelyo  United States
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If you have current versions of Trident they are absolutely stable. Older versions can benefit from a comp cap on the error amplifier. AVCC is very stable - newer versions have improved error amplifiers.
I have those so I should be good

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As for "Warmer" sound, you could experiment with raising the output impedance. And possibly increasing the filter capacitors - this will shift the high end phase a bit and tend to accentuate the mid band.
To raise the output impedance I increase the output resistors correct?

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Originally Posted by Russ White View Post
The latest iteration of the Placid BP is a must have for either the IVY or the Legato. This last iteration has the benefit of exceptional user feedback which has influenced its final form. It has taken the supply to a new level in terms of low noise and low output impedance. The difference it makes in an output stage can be stunning.
I have the latest Placid HD BP. But, I have the older 30 VA transformer. Should I up it to the 50 VA?
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Old 8th August 2014, 04:36 PM   #23
sbelyo is offline sbelyo  United States
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Originally Posted by androa76 View Post
Feedback cap i meant across resistor R22 and R24 (2,2kohm...) you add 100-220pf styroflex or silver mica cap when you use lme49990.
I think R24 is wrong. The feedback cap should be placed across R22 Left and R23 Right Am I correct?
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Old 17th August 2014, 07:14 PM   #24
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Originally Posted by bk856er View Post
Does your strong Placid BP recommendation also apply to Buff II with current gen Tridents + Legato v2? I'm currently using the LCBPS and I've been thinking about a PS change.

Also, is the original 30VA 15+15V trafo adequate for the above setup if I change to the Placid BP? I notice your current offering is 50VA.

BK
Absolutely. The Placid HD (and HD-BP) will be a significant upgrade.
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Old 17th August 2014, 07:17 PM   #25
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To raise the output impedance I increase the output resistors correct?
Yes - 100-221R can make a subtle difference. Some will prefer to use 0R. The effect will depend largely on the load (cables and amp etc).


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I have the latest Placid HD BP. But, I have the older 30 VA transformer. Should I up it to the 50 VA?
30VA is certainly sufficient, but 50VA will give very slightly less ripple at the reservoir caps.
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Old 17th August 2014, 07:19 PM   #26
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30VA is certainly sufficient, but 50VA will give very slightly less ripple at the reservoir caps.
Can one hear the difference?
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Old 17th August 2014, 07:22 PM   #27
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I would say less so with the new Placids, and they have significantly improved PSRR over the previous version - still it is difficult to say what people will find audible.
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Old 19th August 2014, 03:47 PM   #28
sbelyo is offline sbelyo  United States
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Another user here posted that when using a pair of LME49990 in the BAL/SE stage that they will oscillate. He says to use 100-220pf styroflex or silver mica cap for feedback compensation when you use lme49990. When looking at the schematic I should place them across R22 Left 2.2K ohms and R23 Right 2.2K Ohms am I correct?

He states a different number for the right side so I just want to be sure that was an error. Can someone confirm?
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Old 19th August 2014, 04:32 PM   #29
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Correct. MKP ( roe...ero1830 Blue color) can be used if finding styroflex or mica is difficult
And R25 and R26 was 50ohm because i used only se output.

Last edited by androa76; 19th August 2014 at 04:35 PM.
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Old 19th August 2014, 07:52 PM   #30
sbelyo is offline sbelyo  United States
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Originally Posted by androa76 View Post
Correct. MKP ( roe...ero1830 Blue color) can be used if finding styroflex or mica is difficult
And R25 and R26 was 50ohm because i used only se output.
Thanks... I got most of the parts yesterday. I just have to place a digikey order
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