USSA-5 Build with Review

[Vunce]

Hi Fab,
I’m unclear if RV1B/RV2B are removed once RV1A/RV2A are calculated and installed? Thanks.

 

[Vunce]

I made some progress
The SLB psu is good to go and the USSA5 boards are ready for the first stage of adjustments.

 

[zman01]

That's great Vunce. Hopefully you shall have sound soon.

 

[Vunce]

Thanks Zman!
I’m waiting for a new metric tap set, I snapped the M3 tap during my last use
So probably not getting first sound this weekend.

 

[zman01]

Quite frustrating Vunce when you break a tap... and even worse when it delays your project. Don't ask me how I know.

 

[meanie]

Hi Fab,
I’m unclear if RV1B/RV2B are removed once RV1A/RV2A are calculated and installed? Thanks.

RV1B/RV2B stays in place too, after calculated and installed.

 

[Nikos]

Hi Meanie
have you tried a classic PSU A / B against SLB ...
you heard some difference?
Τhanks

 

[meanie]

Hi Meanie
have you tried a classic PSU A / B against SLB ...
you heard some difference?
Τhanks

My USSA5 is about to get house into a new chassis, currently having the heatsinks drill n tap.
So far very happy running with the CRCRC ps. When It does goes into the chassis, it will be powered by SLB.
Then I will post some findings then.

I m still waiting for the proper transformer for the SLB

 

[meanman1964]

Last Sunday I viseted Asanden and we did listen to some music .
USSA 5 and B1Nutube , perfect combo for me .

 

[fab]

I made some progress
The SLB psu is good to go and the USSA5 boards are ready for the first stage of adjustments.

Good progress Vunce
I really like the parts you use for test point
Can you share part number.
Thanks
Fab

 

[Vunce]

...I really like the parts you use for test point
Can you share part number.

Here you go Fab:

5002 Keystone Electronics | Mouser

They are very handy to have, the Fluke “pincher” style leads attach very securely to them. You can find them a bit cheaper than Mouser, try eBay

 

[Vunce]

I have a few heatsink options for the USSA5.
This is the smallest size,
300mm x 125mm x 25mm (fins) with 10mm base thickness.
My planned psu will be 24-26vdc with approximately 1.3A bias current.
What do you think Fellas, will this HS option be adequate for the USSA5?

 

[fab]

This could be ok but it depends on your tolerance on the heatsink temperature ��
To not exceed 50C you may have to reduce the bias between 1.1 or 1.2A.
Fab

 

[fab]

Last Sunday I viseted Asanden and we did listen to some music .
USSA 5 and B1Nutube , perfect combo for me .

Thanks for the feedback, it is quite useful to know which match works fine.
The B1 Korg Nutube has very good review from what I notice.

Fab

 

[Nikos]

Small progress spare parts...

 

[xrk971]

Very nice build there, Vunce!

 

[meanie]

Love those test point pins from Keystone, thanks Vunce for sharing.

 

[thimios]

Love those test point pins from Keystone, thanks Vunce for sharing.

I think that is 534-5000.

 

[thimios]

Small progress spare parts...

Aha good start nikos!

 

[Harry3]

Yasou Niko. I hope you inspire Thimios to build this amp.

My amp is on hold because my wife has made me renovate