Salas hotrodded blue DCB1 build - Page 180 - diyAudio
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Old 5th April 2012, 01:40 PM   #1791
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Hi all

I've been reading this thread for a while
I'm on page 131 for now- its great!

Finished stuffing my board but did not connect to in/output
Vout is 10.13 & 10.20
V at 10R risistors 2.09 & 1.92
DC offset set at lowest reading (2M) shows 0.003 & 0.001)

Looks okay right? but mosfet are not getting warm at all- is this okay?

Thanks
IK
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Old 5th April 2012, 01:52 PM   #1792
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Sorry
For DC offset i measured on the smalest scale of 200mV
1.1 & 1.3

Is that okay?
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Old 5th April 2012, 01:54 PM   #1793
Salas is offline Salas  Greece
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What do you mean lowest reading 2M? 2 millivolt scale on your DVM? If yes, then it measures fine all over. About heat depends on sinks. If you had bolted it to a thick chassis with big sinks it can be cool at 200mA and 10V you run. That 2V/10R=200mA has to go somewhere could not stay at CCS. Is any other component from the non sink ones suspiciously hot beyond the 7812?
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Old 5th April 2012, 01:54 PM   #1794
Salas is offline Salas  Greece
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Just saw you answered the scale. Super OK.
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Old 5th April 2012, 02:00 PM   #1795
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Audio gains against cost gains here are neglidgeable.

I started with Salas shunt reg at about 60mA. It sounded brilliant with the standard B1.

Increasing current to 120mA didn't seem to bring any sonic benefits. But I had the heatsinks so I've left mine at 120mA.

All 600mA does, to me anyway, is roast the MosFets and increase the heatsink cost.

I did try it and, to me, it didn't sound any different.

I'm familiar with Ultra-Fi sound, but the Snake Oil vendors will disagree.

The 2E Maplin Heatsinks that I used are good to about 220mA, after that they need fan assistance.


The proof of the pudding is in the building.

Salas originally specified the Shunt Reg at about 60mA. And, I will support him to the end, it sounds BRILLIANT.
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Last edited by KatieandDad; 5th April 2012 at 02:11 PM.
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Old 5th April 2012, 02:25 PM   #1796
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Cool salas

Thank you for your help
Now its time for the case and wiring and starting the F5.....

All the best
IK
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Old 5th April 2012, 03:03 PM   #1797
palmito is offline palmito  United States
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I did bring mine to slightly above 600ma and noticed improvement in the imaging. To me and my tin ears it was worth the cost of the two 2.5R resistors. Cooling is still good with the "Tea Bag" style heatsinks. I did replace the top of the metal case with a perforated aluminum sheet, just in case.

I've also been playing with the three 100uf caps. I've tried so far Slimic IIs, KZs, Cerafines (older and newer) and STD blackgates. I burned each for about 24 hours (some say not enough for the blackgates) and so far I like the Slimics the best. Compared to all the other caps they sound more defined and increased a bit the width/depth of the sound stage. They also strike a good balance between adding a tad more definition and brightness to the sound. I found the Cerafines were the least bright sounding of the lot, but their sound stage was not as well presented as the blackgates and Slimics. Compared to the Slimics, the blackgates sounded a tad brighter. The originally installed KZs I would rank as last in this pack for me.

All the caps were 24-63v except the blackgates, which I could only find 160v ones for a reasonable price.

Another change for me was to replace the 220k caddock resistors for naked foils (which I was able to afford after taking a second mortgage on my house...). I had already replaced the 220Rs with naked foils. This change opened up the sound when compared to the caddocks. Cymbals also seem to have more texture and extension than with the caddocks. I kept the 1m resistors as caddocks.

I've read some people recommending the FC and NHG panasonic caps, they are cheap enough that I will order some and try them out. The blackgate Ns have become unobtanium and the few I've seen from trusted sources (trusted to me) seem to run abut $50 each. I think I will be skipping these...

All of this is in my system with my ears, the mileage of others will of course vary.

I will post photos when I paint the aluminum perforated cover.

Thanks again for all the support, my system has never sounded better than what it is sounding today!

Last edited by palmito; 5th April 2012 at 03:06 PM.
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Old 5th April 2012, 03:11 PM   #1798
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Quote:
Originally Posted by palmito View Post
I've read some people recommending the FC and NHG panasonic caps, they are cheap enough that I will order some and try them out.


If you liked best Silmics you'll have problem with FCs and others low-esr...to my ears they're always a bit harsh.

BTW after 40 hours the Silmics will be brighter than BGs
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Old 5th April 2012, 03:25 PM   #1799
syklab is offline syklab  Hong Kong
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Hi Dario,
What do you recommend for these 2 100uF ?
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Old 5th April 2012, 03:27 PM   #1800
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Hi Dario,
What do you recommend for these 2 100uF ?
If available Black Gates (FK better), otherwise (but not final, still investigating) Cerafines.
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