USSA-5 Build with Review

[ClaudeG]

I don't know how it sounds, nor if it is worth the hassle, but as with all your builts it looks absolutely perfect!

Thanks for sharing

Claude

 

[fab]

Hi Do
Nice integration of the LT4320 boards from Prasi on the Project16 PSU board

Fab

 

[pinnocchio]

Thanks all for the comments!

For me it was well worth it just for the extra 2.2V on the PSU. I will give it a listen during the week.

Ciao!
Do

 

[Vunce]

Hi Do,

Excellent LT4320 "Rehab" done to your psu boards. I think you’ll find this mod to be well worth the effort

Cheers!

 

[nfsgame]

Nice build. You may try the Quasimodo-rig and populate the snubber pads on the boards, too. It's a noticeble difference (less harsh and cleaner midrange).

 

[nfsgame]

My actual progress

 

[zman01]

nfsgame,

Nice work! Keep us posted on your progress.

 

[pinnocchio]

Nice clean work nfsgame! I like that components are all well aligned!

Do

 

[Vunce]

Nice start nfsgame

 

[nfsgame]

Thanks. More progress... Banana-yellow heat shrink tube !

Q1/Q2 and Q3/Q4 are matched with 2,8% and 4,9% per pair .

Now I'm waiting for the power transformer to arrive ...

 

[pinnocchio]

Love it!

Do

 

[brianco]

Just wait until Fab sees that heat shrink!

Nice work!

 

[fab]

I like bananas
Nfsgame, you win the prize for the best looking input stage
And possibly the best match too...
Fab

 

[AnthonyA]

Eye candy!

 

[zman01]

nfsgame,

Immaculate work, well done!

 

[pinnocchio]

Nice build. You may try the Quasimodo-rig and populate the snubber pads on the boards, too. It's a noticeble difference (less harsh and cleaner midrange).

Snubber shouldn't make a difference on the LT4320 as it does not use diodes, so there should not be ringing. I know it does on the diode bridge. I have another LT4320 that I've setup on a class AB before making the change on this one and I could not tell a difference between snubber and no snubber on that amp. So I desoldered the snubber as I've been told it is not required on ideal bridge.

Do

 

[fab]

Thanks. More progress... Banana-yellow heat shrink tube !

Q1/Q2 and Q3/Q4 are matched with 2,8% and 4,9% per pair .

Now I'm waiting for the power transformer to arrive ...

Hi Nfsgame
Any update on your build?
Fab

 

[nfsgame]

Hey,

I'm still waiting for my ordered transformer from poland. The two boards and the chassis are ready to be powered. But without a power supply I can't go on...

 

[AnthonyA]

Dreaded postal service.

All my international shopping was also not here as early as late January..

Fab any more interesting design?

 

[Bfpca]

Is your transformer from Toroidy in Poland? If so, I think you will be pleased. I have had excellent quality transformers from them in the past.
I’m waiting on 2 quiet fans for mine. They are supposed to be here soon. The fans I have in it sound like a small helicopter is in the amplifier. Not nice in my quiet listening room.