My guess is 25-30mv drop on emitter
Then touch cooling and it should be medium hot and nice to touch
Then you can make small adjustments on one channel, and listening to music you should be able to hear which channel is better
Actually the right bias is an exact value where it is most stable
Then touch cooling and it should be medium hot and nice to touch
Then you can make small adjustments on one channel, and listening to music you should be able to hear which channel is better
Actually the right bias is an exact value where it is most stable
Hi AndrewTAndrewT said:
put down ... no, not at all
heheheActually, I think Greg would like see 30KuF/rail (minimum). This one has 20KuF/rail, but, it is still sounds excellent
Unfortunately the Metaxas self-destructed, so now, it has been re-born into a stable and highly tunefull musical instrument
excellent 
jacco vermeulen said:
Hi jacco vermeulen
Worry not, the re-birth has been well worth the effort
As good as the Solitare was, the GB300D is better, most definitely 
Sorry, the Roederstein caps self-destructed and leaked all over the boards, which likewise self-destructed, so, the PS caps are now BHC aero's
MODS FOR ska
heY everyone, I'm in the process of putting my SKA's together, I am still awaiting for parts and sourcing a enclosure.
DOes anyone have updates on the mods shinObiwan and MAcka?
I want to implement the mods myself just wanted to know how everything is sounding.
This is my first amp build and I am no way an EE but this site and others have been very helpful, Gregg himself is such a great guy and has any question that I 've had for him!
BTW, what is every one using with their SKA'a
Thanks Everyone!
heY everyone, I'm in the process of putting my SKA's together, I am still awaiting for parts and sourcing a enclosure.
DOes anyone have updates on the mods shinObiwan and MAcka?
I want to implement the mods myself just wanted to know how everything is sounding.
This is my first amp build and I am no way an EE but this site and others have been very helpful, Gregg himself is such a great guy and has any question that I 've had for him!
BTW, what is every one using with their SKA'a
Thanks Everyone!
KLe said:Hi msamkl
The Metaxas GB300D has absolutely no hum/noise. Its as quite as a mouse.(closest one I could find to a mouse)
So, maybe your should email Greg about how this one was constructed. Just an idea
Hope this is helpful
Thanks KLe, maybe ShinObiwan and Macka could help me if they were able to send me their Grounding schema. I'm in constant contact with Greg and he's making any effort to help me out with this. Here is a picture of my Amp's inside...
Thanasis.
Attachments
Hi msamkl,
I, too, have an SKA with no grounding problems. After trying a couple of different approaches I implemented the designers grounding scheme exactly as he suggested. You can see from the spectrum that I posted earlier that all supply artifacts are 100 dB or more down. My system uses a single transformer and a single supply, so it may be a bit easier.
Did you use two conductor shielded input wiring or single shielded input wires? Do you have both ends of the input shield connected?
Bill
I, too, have an SKA with no grounding problems. After trying a couple of different approaches I implemented the designers grounding scheme exactly as he suggested. You can see from the spectrum that I posted earlier that all supply artifacts are 100 dB or more down. My system uses a single transformer and a single supply, so it may be a bit easier.
Did you use two conductor shielded input wiring or single shielded input wires? Do you have both ends of the input shield connected?
Bill
Hi Msamkl,
just a thought when looking at your pic of the perforated baseplate.
When wiring up mains supply from a metal distribution board enclosure, it is absolutely imperative that all the cables (L+N+E) coming from the mains incomer pass through the same hole and similarly all the cables feeding out pass through the same hole.
You have effectively put flow and return through different holes for every supply coming into and out of the transformers.
Has this anything to do with the hum?
Have you double insulated each cable (cord) as it passes through the perforations or at least put grommets around them? Particularly the mains input which should be double insulated and grommetted.
just a thought when looking at your pic of the perforated baseplate.
When wiring up mains supply from a metal distribution board enclosure, it is absolutely imperative that all the cables (L+N+E) coming from the mains incomer pass through the same hole and similarly all the cables feeding out pass through the same hole.
You have effectively put flow and return through different holes for every supply coming into and out of the transformers.
Has this anything to do with the hum?
Have you double insulated each cable (cord) as it passes through the perforations or at least put grommets around them? Particularly the mains input which should be double insulated and grommetted.
wwood said:
Guys,
Disregard my wiring layout on post #97. It was based on msamkl's
two diagrams on posts #95 and #96. They are wrongly
representative of the boards grounding. Looking at these diag's
I assumed that SKA had only 1 ground on the board and based
my solution on that.
I just saw the original diagram on post 1 by macka and it is obvious
from this diagram that the grounds are split on the board and
separated by some R, probably 10 ohms. It would have been nice
if someone had mentioned this.
Too busy to take in -all- the details of the thread.
Cheers,
Terry
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