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USSPA Build thread
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Old 2nd August 2019, 02:17 AM   #11
fab is offline fab  Canada
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I am glad your friend likes it

Fab
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Old 3rd August 2019, 04:16 AM   #12
AnthonyA is online now AnthonyA
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IMG-20190802-WA0031.jpg
Yes he changed it.

He commented its the most successful diy preamp he made.and he made plenty.

He is going to make a 18v supply using Sony schematic.

So far I still prefer 1963 3015 version. It gets better as It breaks in. The sound is much more heavy and focused. And the dynamic and bandwidth is better..


IMG-20190803-WA0006.jpg
Another buddy was so angry I did not get a set pcb that he made it himself . He decided to make balanced for his x150 phasslab. Feeding to his kharma speakers
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Old 4th August 2019, 05:17 AM   #13
fab is offline fab  Canada
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Excellent...the USSPA spreads out
Keep on reporting
I can have another small batch of pcb done if required.

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Old 7th August 2019, 04:02 PM   #14
AnthonyA is online now AnthonyA
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OK Fab, I'm interested and need 7 sets more usspa boards. Please reprint them.

I reckon others might take the opportunity join in here to get the pcb board
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Old 7th August 2019, 04:18 PM   #15
AnthonyA is online now AnthonyA
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Well recorded off Samsung hp
Hope you like Chinese songs
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Old 8th August 2019, 04:29 AM   #16
fab is offline fab  Canada
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No problem for other USSPA pcbs.
I will wait until August 13th to take other members possible pcb orders and then I will send my order to the pcb manufacture for the required quantity. Ordering quantity is either 5, 10,15, 20, 25....
Price will be in the range of about 10$ plus shipping (CAD) depending on quantity. One pcb is a stereo set that can be separated.
I have an assembly manual for the pcb buyers that includes USSPA1 (mosfet output) ans USSPA2 (bjt output).
So please hurry.

List:
AnthonyA : 7 pcbs


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Last edited by fab; 8th August 2019 at 04:53 AM.
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Old 8th August 2019, 04:57 AM   #17
Vunce is offline Vunce  United States
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USSPA Build thread
List:
AnthonyA : 7 pcbs
Vunce : 2 pcbs
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Old 10th August 2019, 02:37 PM   #18
fab is offline fab  Canada
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Default Small group buy for pcb

Just a reminder.
H2 can be adjusted to suit your taste but nominally it is already good enough
I find USSPA2 with excellent audio Sanken bjt transistors as output is as good as USSPA1.

Find below extract of manual. The bom includes the detailed part numbers from Digi-Key (most parts).

Fab
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File Type: png 11CF4FD9-8274-4F1E-A7EC-B7609F26FC41.png (408.7 KB, 292 views)
File Type: png 1CDDD87E-4861-47F7-9CA8-4AC1204B9D12.png (628.1 KB, 284 views)
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Last edited by fab; 10th August 2019 at 02:42 PM.
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Old 10th August 2019, 05:05 PM   #19
Vunce is offline Vunce  United States
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USSPA Build thread
Thanks for putting together this small preamp GB, Fab.
Your time and effort you put into your manuals is much appreciated.
The attachments you included are just page 1 and 2. Where can I download the rest of the manual? Thanks!
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Old 11th August 2019, 02:40 PM   #20
fab is offline fab  Canada
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Default USSPA small group buy

Hi Vunce
You are welcome. I think detailed manual is important to ease assembly.
Every pcb buyer will get the full manual by email.
In the mean time, here is another extract of manual showing schematics of USSPA2.

Fab
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Last edited by fab; 11th August 2019 at 02:42 PM.
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