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Legato Tweakers Thread...

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#246
ok, good to go now on parts placement, etc...

back to the Tantalum resistors for the CCS of the I/V.

Decided to go the 180R / 390R route to get the 1.9v output ( I'll make sure the Balanced to SE traffo can handle it).

Can't find 1W 780R Shinkoh's. So seeing now that the 681's were in parallel, I found a 1W 1K8R and a 1W 550R I can use parelled to get 391R

Unless there is a problem with non-identical values in parallel, this will me the chosen path (of the moment)

JD
 
#255
RichLund said:
Hi Dan

I used Vishay S104D resistors for I/V as they have a current rating of 1W and TX2575 as output resistors (for SE) All I can say is my Legato sounds damned good.

I'm slightly confused as to whether 1W is necessary for the I/V resistors. If not then the TX2575 would be excellent otherwise consider the S104D's they work very well I think. To my ears there was an improvement.

Vishay (Texas components) make the Z foil version S104Z @ 1W, which would be even better but a bit pricey.

I'm sure you won't be disappointed whatever you choose. If you want I can give you the prices I was quoted for various types.
Click to expand...

Cheers Rich, will have to check the dissipation requirements of the I/V resistors. Actually these are quite a long way down my rather ridiculous "HiFi to do" list. 😱
 
#258
How symmetrically you run the Legato (1 or 2) rails will depend on your choices for the CCS and I/V resistors. 😎

If you omit the relay and the BAL/SE stage and want to use high output swing (say 4VMRS) then if you increase the resistors accordingly you can actually run the legato with rails around ~20V with no issues and somewhat increased dynamic range. But please only ever try something like this is you are absolutely confident in what you are doing. 🙂

Cheers!
Russ
 
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#259
Russ White said:
How symmetrically you run the Legato (1 or 2) rails will depend on your choices for the CCS and I/V resistors. 😎

If you omit the relay and the BAL/SE stage and want to use high output swing (say 4VMRS) then if you increase the resistors accordingly you can actually run the legato with rails around ~20V with no issues and somewhat increased dynamic range. But please only ever try something like this is you are absolutely confident in what you are doing. 🙂

Cheers!
Russ
Click to expand...

So to run +15V - 13V I have to change I/V resistors R5-R8 4 105R instead 4 1K & Current source resistors are 475R (2 x in parallel) so I have to added 4 resistors in parallel with the just soldered in the pcb?

Thanks

Felipe
 
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