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Old 21st December 2012, 12:04 AM   #51
Tea-Bag is offline Tea-Bag  United States
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Blink - What changes are you talking about to the design?
If higher IDSS than 8ma, Nelson suggest using 10R degeneration resistors.
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Old 21st December 2012, 12:09 PM   #52
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Quote:
Originally Posted by Tea-Bag View Post
Here is the proposed mouting for Universal Specification if you have one of the store chassis.
The FETs would go into red or blue postitions. If its in the blue , you can mount one set of standoffs in the green area direct to chassis.
Since the mounting on the blue taps will leave the board very close to the bottom of the chassis - I cannot guarantee that it fit there. We just made it under the limits of the proposed area.
If anyone already has these chassis, let me know - I can send you physical print out to measure against the actual chassis.
I have the 4U "Deluxe" chassis on hand (the pre-drilled version), for my in progress F5 build. I'd be happy to check things out if you'd like.
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Old 21st December 2012, 12:50 PM   #53
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Do you have a fax machine? Else I am going to see about PDF conversion.
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Old 21st December 2012, 12:53 PM   #54
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If its like F5T boards, it will fit fine. Still advise mounting fets to ink before soldering to board. This makes certain that coupling to sink is optimal.
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Old 21st December 2012, 01:02 PM   #55
6speed is offline 6speed  United States
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Quote:
Originally Posted by Tea-Bag View Post
Do you have a fax machine? Else I am going to see about PDF conversion.
Yes, PM sent.
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Old 23rd December 2012, 01:21 PM   #56
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So some good news.

6Speed has helped me with the layout in an actual diyAudioStore chassis.
We shaved a few mm off the bottom to get it to clear without issue. I may see if we can do a little more, so the board so will have a little more clearance.

There has been a new source of R100's and R100A's available. His name is Semisouthfan on diyaudio. Check out the post by him below.
Semisouth goes Dodo ; what now ?
He is asking 50.00 per device for these. All things considered, no getting around it - a fair price I guess considering they are obsolete. I beleive they are unmatched.

Lastly, I have 'mule' test amp running in chassis, running in my main rig. This will allow me to evaluate the sound of the transformers a bit more.
I tried running the unbuffered version. while it ran in my bench, the output from my x-over I guess did not match. Running with buffer seems the way to go!
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Old 23rd December 2012, 06:00 PM   #57
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I am discussing with SemiSouthfan about getting some of these in quantity and matching them. With that said, I am going to open up my SemiSouth waiting list again.
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Old 23rd December 2012, 06:37 PM   #58
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I am intereseted,

please put me down for a set

thanks Teabag
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Old 23rd December 2012, 06:46 PM   #59
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I will get on the list as well....
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Old 24th December 2012, 12:32 AM   #60
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One can certainly tell the difference between transformers.
The question than becomes which one sounds best?

Initial impressions only listening to Vinyl of Neil Young - "after the gold rush"

The Jensen sounds delicate and with a relaxed tone to it.

The Onetics sounds more forward, discrete, closer to clinical, and less colored. It almost sounds a little clearer, but the Jensen does not hide anything I don't think.

The amp itself, regardless of transformer has a very wide soundstage, and a fair amount of depth to it. I don't think it sounds like other Firstwatt clones at this point.
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