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Old 6th July 2013, 09:57 AM   #11
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by PauloPT View Post
The BC556C are obsolete parts ....................
Are you correct?

There are many BC5xxc manufacturers. Are they all no longer making these transistors?
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Old 6th July 2013, 10:24 AM   #12
PauloPT is offline PauloPT  Portugal
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Quote:
Originally Posted by AndrewT View Post
Are you correct?

There are many BC5xxc manufacturers. Are they all no longer making these transistors?
I can't say all manufacturers but some time ago I was searching for the C grades and I was only able to find some at a local shop. I was then informed the C grades were obsolete and no longer manufactured. However, the NPN complement - BC546C - are easy to find.
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Old 6th July 2013, 01:07 PM   #13
weskoki is offline weskoki  Europe
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Thank you for your answers.

KSC1845/KSA992 seem to be a good alternative if the E grades can be found.

I really like this amplifier, one of the best I built.

Have you compared it with other designs?
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Old 6th July 2013, 02:15 PM   #14
PauloPT is offline PauloPT  Portugal
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Originally Posted by weskoki View Post
Have you compared it with other designs?
When I first build the GB150D I had a NAD C320BEE that I used in a daily basis. After building the SKA I immediately sold the NAD. The difference was so huge that I couldn't stand the NAD anymore.

I've built other amps as to name a few: P3A, gainclones, Symasym, DX, LM4930 with IRFP9240/240 outputs, some kit from eBay with 2SJ201/2SK153.
None could reach the heels of the SKA.

What most impresses my in the GB150D it's the huge dynamics and the smooth highs, never harsh, very detailed with extended note decays, very natural sounding. I read somewhere that the GB150D sounds like powerful tube amp and I agree entirely.

Now I'm buiding the VSSA, Shaan's version. It's too soon to comment in the sound and make a comparison between the two, but I can say it's a contender to the SKA. It has a more forward like sound, the SKA is more laid back. They're both impressive amps, the 2 bests I built.

Here are some SKA reviews:
Simple Killer Amp - Listening impressions
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Old 6th July 2013, 09:51 PM   #15
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The output devices being Vertical MOSFETs, how is thermal compensation achieved in this design? Any component in thermal contact with the Output devices or Heatsink?
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Old 7th July 2013, 12:43 AM   #16
repeet is offline repeet  Australia
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Yes D5 and D6 are either mounted on the output mosfet or in the heatsink depending on device chosen.
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Old 7th July 2013, 01:53 AM   #17
Stuey is offline Stuey  Australia
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For this, I used BD139 & BD140 diode connected and piggybacked on the MOSfets.
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Old 7th July 2013, 12:07 PM   #18
PauloPT is offline PauloPT  Portugal
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Quote:
I've built other amps as to name a few: P3A, gainclones, Symasym, DX, LM4930 with IRFP9240/240 outputs, some kit from eBay with 2SJ201/2SK153.
None could reach the heels of the SKA.
I didn't mean to imply the mentioned amplifiers are bad sounding, quite the opposite - they're very good pieces of art and work that should made proud their designers and they trash many good commercial amplifiers.

However, I also must say that my personal preference, by far, goes to the SKA.

One aspect that I think it's important to the sound of the SKA is it's huge PSRR making it sound very good even with a modest and noisy PSU - a simple arrangment of 3 x 4700uF per rail is enough to make this amp sing!
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Last edited by PauloPT; 7th July 2013 at 12:12 PM.
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Old 7th July 2013, 02:10 PM   #19
PMI is offline PMI  United States
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One aspect that I think it's important to the sound of the SKA is it's huge PSRR making it sound very good even with a modest and noisy PSU - a simple arrangment of 3 x 4700uF per rail is enough to make this amp sing!
LC claims >100db PSRR for VSSA. So in theory, the two designs should be comparable in that respect.
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Old 7th July 2013, 02:55 PM   #20
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I think it is time to start building some PCB's for this amp. it looks like is a good candidate and deserve to be build.
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