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Old 14th May 2007, 08:42 PM   #21
Fenris is offline Fenris  United States
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Nothing wrong with EI cores - I use them in about 50% of my amps. They're bigger and have more potential for stray magnetic fields (and some hum), but they work just fine.
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Old 15th May 2007, 02:14 AM   #22
alexw88 is offline alexw88  Hong Kong
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So far we have :

Member # of boards
========================
HIPCHECK 6-10
Tryonziess 6
Alexcd 8
Analogdiy 6-8


Let's wait a couple more days to see if more members want to join...
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Old 15th May 2007, 03:02 AM   #23
AR2 is offline AR2  United States
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Quote:
Originally posted by Upupa Epops
Very nice and clean construction, Alex... But try to think about different input amp - DRV 134 have little bit " synthetic " sound...

I agree with this as well. What would you suggest Upupa? I would prefer discrete circuit, or even better tube. If Lundahl or Jensen could be used that would be the best and the simplest solution in my mind. They are around $ 90.00 last I checked.
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Old 15th May 2007, 12:11 PM   #24
alexcd is offline alexcd  United States
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$90 per mono for a premium front-end is a bargain but wouldn't the input impedance be a tad low for non-active preamps?

Alex, would it help if I bought 4 more?
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Old 15th May 2007, 12:48 PM   #25
alexw88 is offline alexw88  Hong Kong
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For transformer at input you need to match impedance on both side. i.e. you need a low output impedance pre-amp (likely a active one) and a high input impedance at the PA150 PCB (which you need to change the 10k/200k resistors combo)

Don't worry about the magic number "40" I think we are close enough.

Member # of boards
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HIPCHECK 6-10
Tryonziess 8
Alexcd 8
Analogdiy 6-8

Total : 28-34
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Old 15th May 2007, 12:55 PM   #26
alexcd is offline alexcd  United States
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The transformer sounds like an issue for me.

I'm going to need the DRV134 or similiar.
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Old 15th May 2007, 01:21 PM   #27
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hey guys, just figured id let you know, I have talked to Alexw88 about getting started finding all the parts needed for the amp.

so far I will donate all 1% smd reesistors needed to parrallel the amps

If the 10uf solen is used for al the amps than we can get them @ $2.75 each x100 units. (avg price is $4.00 ish)

I would also like to know (and Im sure opinions will vary) what elec caps everybody would like. Panasonics FM/FC? Elna? Nichiconc? etc.

Is everybody happy with the Wimas (mkp?) (0.1uf)

Im waiting on an email about the 50k trimpots.

I would prefer to keep this OT, but if a parts order was made it would require some discussion of parts.
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Old 15th May 2007, 01:24 PM   #28
alexcd is offline alexcd  United States
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Thanks for the effort hipcheck. Group buying all the parts would be a great idea!
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Old 15th May 2007, 01:44 PM   #29
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it would be a huge cost per person to build this amp without buying bulk. I am just doing some digging right now, and if this buy goes active, maybe also we can buy parts together.
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Old 15th May 2007, 01:48 PM   #30
alexcd is offline alexcd  United States
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I was just thinking.... 4 amps $$$$ yikes! If I can help track stuff down let me know.
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