Salas SSLV1.3 UltraBiB shunt regulator

[UMarcus]

Hi Salas, thank you to point that out. Good read.

 

[euro21]

I'm curious about comparing this LT3045 setup with the UltraBIB. I will let you know the result

It will be more as day and night
I replaced all LT3045 PSUs (2..6 paralleled) in my DAM1941 DAC. I never look back.

 

[UMarcus]

It will be more as day and night
I replaced all LT3045 PSUs (2..6 paralleled) in my DAM1941 DAC. I never look back.

Thanks for your information, I'm looking forward to receive the parcel and build up the UltaBIB. In my setup I will replace 3x pos, 3x neg rails of LT3045 located in the DAC and in the AMP.. It would be amazing if i got some SQ improvements in all that places


Did you have done some specific changes in the UltraBIB or let say just stock build with recommended parts ?

 

[UMarcus]

Just a image of the current situation

 

[euro21]

Did you have done some specific changes in the UltraBIB or let say just stock build with recommended parts ?

Nothing special, I use Ohmite (1.2R and 1.8R WW AG5) resistors as R1.

 

[ghitus]

Hi all, I'm waiting for all the components, then I'll start building. May I use, in your opinion, vertical heatsinks instead of the baseplate?


Many thanks,
Gaetano.

 

[brian92fs]

I was wondering the same thing. And which ones might work.

 

[Salas]

Vertical works better for airflow when feasible. In combination with top and bottom box ventilation slots. For substantial dissipation set ups where just using the base plate isn't enough.

 

[astromo]

I've searched the thread and the build guide for information on fuse selection and it's limited or hasn't shown up for me.

Bearing in mind that I'm not implementing the anti-ringing capability, the points that I'd like guidance on are:

1. Fuse type recommendation or guidance for selection? Slow or fast blow?
2. Fuse current rating selection guidance - what's a sensible margin above the selected CCmA current?

I'd expect that inrush current will be a factor to both points and in that vein, I can't see guidance on where the current will peak to on start up (apologies if I've missed it).

I recognise that the build guide notes:

The limiter will not source “unlimited” current to a fault and pulls steady current from the previous block. Its a perturbations barrier and a safety device in other words.

but I'd rather not rely on a single line of protection.

Thanks for the input ..

 

[Salas]

Talking primary and secondary side transformer fuse?

https://solahevidutysales.com/pdf/transformers/Fusing.pdf

 

[astromo]

Primary fuse.
I think the link covers what I'm after. My thinking was in that ball park but the additional guidance is reassuring.
Thanks - appreciated.

 

[stew1234]

I am planning to use two pairs of ultrabibs to supply 38v with CCS set to about 300mA of CCA (likely shunting 150 maybe 200 in which case I'll drop CCS down a bit).

I had 40v Mundorf AGs I used to build the sets when I thought I would be using them at 15v with another i/v stage. Should I swap these out with higher rated caps? The next up for Mundorfs would be 63v.

 

[Salas]

Surely to set 38V DC output you would also want at least 5V higher raw DC (rectified DC). That condition exceeds 40V on C1.

 

[donhughes111]

fusing

Talking primary and secondary side transformer fuse?

https://solahevidutysales.com/pdf/transformers/Fusing.pdf

What factor do you apply if you are building dual mono?

Thanks,
Don

 

[Salas]

If with one common mains fuse but two trafos you add their VA and then you look it up

 

[ghitus]

Hi all, if I want 24V output from the UB, should I choose different components from lower voltages? I would like to use it to supply a B1 with Korg triode...

Thanks everybody,
Gaetano.

 

[Salas]

Hi

The component values of the standard schematic will work for you. You could arguably use 10k trimmer instead of 20k but better not just in case it will prove marginal for reaching 24-25V due to possible tolerances in the active components.

 

[Marra]

I used 3R3 for R1 on the UB to power my B1 K nutube pre.

 

[ghitus]

I used 3R3 for R1 on the UB to power my B1 K nutube pre.

Hi, what is the secondary AC voltage that you input in the UltraBib?

 

[astromo]

Here's an outline of how I would do it, to suit conditions local to me, while accounting for the advice and supporting info provided by Salas in Post #1.

For a small transformer (I've referred to some vendor data for a toroid), the regulation / sag at load is significant. For the assessment attached, I've not added any margin or other factors.