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-   -   Upgrading the by-pass Caps for Aleph 30 (http://www.diyaudio.com/forums/pass-labs/24638-upgrading-pass-caps-aleph-30-a.html)

Jozua 22nd December 2003 07:30 AM

Upgrading the by-pass Caps for Aleph 30
 
Hi everybody

This might be old hat for most of you guys but I made a small tweak which made a quantum difference in my DIY amp's sonic performance.

I initially replaced the ERO 1yF cap with a a Theta cap. The tops were stunnly clear and very fast. After one day I tired of the sound and then replaced it with a Sonicap and walla what a total transformation. The midrange and bass definition sounded so much better. It is hard to believe that a single cap can cause such a transformation.

Now if anybody knows how I can get the bass on this amp to sound tighter I would be all ears.

X-mas wishes to all

Jozua

stappvargen 22nd December 2003 10:44 AM

I'm sorry, but I don't understand which cap you are talking about. Do you mean C8 (10 picoF) or C7 (1 nanoF)?

Merry X-Mas!
/Niclas

Jozua 22nd December 2003 11:01 AM

Bypass caps for Aleph 30
 
Hi

My amp has three by-pass caps per channel on the PSU. I do not have the circuit diagram for the amp and simply replaced what was already soldered on. I suspect it is C8. I also upgraded the C7 but is made the amp to warm (valvy-sounding) for my liking.

I am now wondering what would happen if one upgrades some of the other parts was well. The amp already has a 600 Va transformer and about 60.000 mfd per channel.

Overall I am very impressed with the sound quality.


Jozua

stappvargen 22nd December 2003 01:19 PM

Ah, thanks for clearing that up for me. I thought you meant any of the feedback caps. I don't think the original PSU has any bypass caps in the schematics.
(http://www.passlabs.com/pdf/aleph/a30manr0.pdf)

/Niclas


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