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Old 21st May 2012, 10:02 PM   #31
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hehe if you dont. i have around 100
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Old 21st May 2012, 11:42 PM   #32
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Well, pulled the trigger on some big parts today. (8) 8"x10" heat sinks AND (2) 800VA 20V transformers. Both from Antek/par-metal. What have I done!?

The digi-key cart is continuing to grow as well.
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Old 21st May 2012, 11:45 PM   #33
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hehe you started on a road filled with a sound from heaven not a bad way to spend 20 years
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Old 22nd May 2012, 03:58 PM   #34
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Turns out I have plenty of 550's to choose from. I think I have the B's and the C's actually. My understanding is the C's would be preferable due to higher hfe?

Looks like the pins are indeed different from the 2SC2240. Might be a little tricky since it's not backwards... it's 3,1,2 so two pins would cross. Will have to be careful not to short them.
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Old 22nd May 2012, 06:56 PM   #35
gl is offline gl  United States
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I love your projects. You do beautiful work.

If you still need the input MOSFET's (when you say Aleph X I'm assuming you mean the original with the MOSFET diff pair input version) I would be happy to send you two matched pairs of Intersil IRF9510's free - no charge. They are taken from the original boards shown in my amplifiers here:

AX100 100W Aleph-X Monoblocks

IMO the 9510's work better here because they have a bit more admittance and the Intersil parts don't have the gain shelf issue that the IR/Vishay parts do either. If you want matched IR 9610's I can do that instead, but you'll have to wait a couple of weeks for me to match them.

I will also send you two irf9610's for the CCS's for the diff pairs.

I converted my amps to JFET front ends years ago. The JFET's sound better.

I have used the AX100J's continuously for the last 5-6 years and I really am happy with them. Recently though, I have been thinking about building a pair of 200W F5T's. It's the first circuit to come down the road in all that time that has tempted me. So I find it fascinating that you are on what I would call the opposite road.

I don't think my PM is enabled. So give me a chance to get that going and you can send me your shipping address. If you're going to the 2012 Burning Amp and are willing to wait I can hand these parts over in person.

Graeme

Last edited by gl; 22nd May 2012 at 07:09 PM.
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Old 22nd May 2012, 07:31 PM   #36
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Wow, thanks Graeme! For both the compliments as well as the offer for parts. My projects are done as cheaply as I can without being entirely embarrassing to show in public. It's a delicate balance. Plus, they probably look worse in person once you get close.

Your Alephs are pretty awesome though! I love the exposed parts and heat sink design.

A couple pairs of 9510's with 9610's for the CCS would be awesome! I actually have some spare JFETs (2SK170BL and 2SJ74BL) lying around so maybe I'll do some research there to see if I should pre-emptively make the "upgrade." My guess is I'll go with the standard build for now though since I have all the parts for that already. As such, I'll look for your PM and get you my address. Thanks again!

Will hopefully see you at burning amp!
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Old 9th June 2012, 12:52 AM   #37
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Boards are soldered up and $180 worth of caps arrived today:

Click the image to open in full size.

Still waiting on the trafos and heat sinks and such.
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Old 12th June 2012, 03:04 AM   #38
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Big shipment today from Antek:

Click the image to open in full size.

8 heatsinks (8" tall by 10" wide)
2 trafos (800VA each, four 20V secondaries)

Time to start drilling and tapping lots of holes.
Need to run by the metal place and pick up some scrap 1/4" aluminum plate for the bottoms too.
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Old 12th June 2012, 06:28 PM   #39
gl is offline gl  United States
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The place I buy metal sheet and rod stock is onlinemetals.com.

Graeme
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Old 12th June 2012, 06:30 PM   #40
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There's a metal place local to me that has scraps for cheap that are fine for these small (relatively speaking) projects so I'll probably hit them up on the way home from work today.
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