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For Sale XA252 PoP R1

Things you have for sale.
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Joined 2009
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I have for sale a few more PoPs, R1 this time with better layout and performance.

These can be tuned to have more or less flavor so it can suit all tastes by changing a few key components in the front end. Depending on your taste you can mention what exactly you want, less flavor meaning less thd.
From the strongest flavored to the light flavored at some power levels the thd is half.
Please see the new thd graphs at the bottom of the post where I compare the same module setup in 2 different ways.

24-06-20 18-29-11 7334.jpg


Since some time I go ahead with the Xa252 PoP being the reference amp in my system.

It can work from +/-16v to +/-24.5v. Bias is preset at 1.4a.

The schematic looks like this
Screenshot_20.jpg



Stable as before when handling square waves
24-06-18 12-18-57 7279.jpg



The new pcb has same drill hole pattern as R0
pop fixing.jpg



And here some thd measurements
1w4r.jpg

1w8r.jpg
10w4r.jpg
10w8r.jpg
20w4r.jpg
20w8r.jpg
40w4r.jpg


All modules are tested and working. If no preference for the thd the modules will ship with the stronger flavor.

Later edit:
I am adding a crc psu pcb together with the modules for the same price.
IMG_9493.jpeg


Price for 2 channels and the crc psu pcb 160€



Later edit:

Someone said he uses a 5U400 enclosure for his builds (which is quite big) and is able to take 1.8A bias at +/-24V. So the user wanted to use the modules at a higher bias(1.8A) than the 1.4A as I set them.
With a higher bias for the output stage you will get more power output in class a(which you have plenty already with 1.4a bias) but also a bit more thd at high output power. So I think this time it`s better to keep it at 1.4A.
The maximum bias that can be set for the PoP modules is 1.6A so I took the measurements here, didn`t bother to modify the tested module to go to 1.8A. It isn`t really needed for the PoP.
bias 1w4r.jpg

bias 1w8r.jpg

bias 10w4r.jpg
bias 10w8r.jpg
 
Last edited: