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Legato Tweakers Thread...

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#141
Received my Legato today, very nice.

Before I start can I ask what the components marked with an 'X' are: R25 - R28, QN7 - QN14. Are these the output buffer?

Should I omit the buffer if using with DCB1 preamp?

Thanks
 
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#142
RichLund said:
Received my Legato today, very nice.

Before I start can I ask what the components marked with an 'X' are: R25 - R28, QN7 - QN14. Are these the output buffer?

Thanks
Click to expand...

Hi Rich,

Thanks for the kind words.

Did you check out the manual yet?

I think you will find the answer there. 🙂

If your amp has an input impedance > 5K or so, then I would omit the buffer. But it is completely up to you.

Cheers!
Russ
 
#145
Ahh Russ, my face is lodged firmly in my palm... doh!

As usual superb quality kit from you boys. I will be using SE and will also try some of the mods recommended in the thread.

I shall check the specs of the rest of my kit.

Many thanks for the speedy reply.
 
#146
RichLund said:
Ahh Russ, my face is lodged firmly in my palm... doh!

As usual superb quality kit from you boys. I will be using SE and will also try some of the mods recommended in the thread.

I shall check the specs of the rest of my kit.

Many thanks for the speedy reply.
Click to expand...

If you are only using the SE output it is already buffered so you can very safely omit the balanced output buffer, and I would recommend that.

Cheers!
Russ
 
#147
Russ White said:
Yes you can. You can also use 2 Buffalo II with one Legato. Both approaches yield excellent results.
Click to expand...

Excellent, thanks! So one Legato will do, but dual mono requires two Ivy III (per the website)? Of course I have one Buff II and one Legato and one Ivy III, so I have to get my system combobulated.

Unrelated trivia: the IV lock device (as in intravenous), was developed at the University of Colorado in Boulder (the Buffs, for the football team, the Buffalos) and so in Colorado only, this device is called a "Buff cap", or Buffalo cap. At least they have not yet come out with the Buffalo II cap. I am already getting confused....
 
#148
Russ White said:
It is possible to run without caps that way as long as the SE offset is low enough. This will not always be the case. If your measured SE offset is low then you are fine. You will just need to check that carefully. If you like you can even trim out the offset using a parallel trim resistor on the CCS for the side that you want to adjust downward.

If you only use SE output you can definitely use lower value film caps. Say 2.2-4.7uf. Then you will be completely safe and no worries about offset in the least.
Click to expand...

Russ - I plan to run the Legato SE into a Nelson Pass B1 Buffered passive preamp that has 1uf input caps. Does this mean I can safely omit the C5-C8 100uf output caps?
 
#159
pell...

You need to change both R1-4 and R20,21,23,24 to change the gain. I believe Russ notes the ideal ratio between the upper resistors and lower is 2.2.
I got 1.9 volt output with the following combination:
R1-4: 180R
R20,21,23,24: 390R
 
#160
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