Rank: Member
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Joined: 9/24/2012(UTC) Posts: 30  Location: Santiago
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Hello guys,
I am lucky, a friend is building a SET tube amplifier for me.
I have asked him to add XLR inputs, to take advantage of the Legato 3.1 balanced outputs. This is a buffalo III implementation.
He made me the following questions:
How much voltage the legato has?
I understood from manual, that with standard resistors, it's 1.5 Vrms at 0dB.
How much output impedance?
I have no idea, can you help me please? :)
My friend told me that usually, the He would use a 600ohms:10kohms transformer to transform balanced to unbalanced signal. Any advice will be very appretiated.
Thanks!
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Rank: Member
Groups: Member
Joined: 9/24/2012(UTC) Posts: 30 Location: Santiago
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Bump :)
Perhaps someone knows how to calculate legato balanced output impedance or has a link to where it has been discussed?
Perdon my ignorance.
Thank you.
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Rank: Administration
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Joined: 10/24/2006(UTC)
Posts: 3,979
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The output impedance is slightly less than the value of the I/V resistors at the balanced outputs.
At the SE output it is almost nothing.
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Rank: Member
Groups: Member
Joined: 9/24/2012(UTC) Posts: 30 Location: Santiago
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Thank you Russ,
So if I understood well. For the standard kit values, balanced output impedance is 150ohms.
I have been looking at the legato circuit, but I don't understand the Balanced stage yet.
Looks like the parallel FET stage and a current source ?
I tried to understand how the negative rail sets the bias of those fets, but is like I m lacking of some FET kwoledge YET.
Cheers and thank you
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Rank: Member
Groups: Member
Joined: 9/24/2012(UTC) Posts: 30 Location: Santiago
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Hello Again,
Regarding the balanced output of Legato 3.1 (with buffalo III stereo configuration).
What is the DC voltage between (+) and (-) balanced terminals.?
What is the VRMs max (0dB) voltage between (+) and (-) balanced terminals?
Many thanks
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