NAP-140 Clone Amp Kit on Ebay - Page 21 - diyAudio
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Old 25th May 2008, 11:40 PM   #201
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Thanks Gabor, please keep me posted!

Are these kits foolproof, can I assemble and play or do I need to test it, set bias (bias?) etc first? If I do, I have a freind whos built Amps before, maybe he can help.

Can anyone reccomend a suitable power supply, preferrably some kind of kit? And where do I get a nice chassis from?


Mike
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Old 25th May 2008, 11:47 PM   #202
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HI Mike
For Q5 use TIP41C on the heat sink with wire .Follow the schematic not the board .
Look up the legs of the TO220 transistor and with 3pc of wire connect into the place of Q5 .
Don't forget to connect the input ground to the main ground with out the amp is not working at all .
Regards
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Old 26th May 2008, 12:03 AM   #203
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Quote:
HI Mike
For Q5 use TIP41C on the heat sink with wire .Follow the schematic not the board .
Look up the legs of the TO220 transistor and with 3pc of wire connect into the place of Q5 .
Don't forget to connect the input ground to the main ground with out the amp is not working at all .
Regards
Sorry Gabor, what are you reffering to here?

Mike
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Old 26th May 2008, 12:49 AM   #204
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HI
For Q5 use TIP41C on the same heat sink were you mount the power transistors , inportant !
Use 3PC of wire and simple connect it to the PC board for Q5.
Please look up on the net TO220 case because TIP41C is in TO220 case and follow the schematic not the mark on the PC board .
For power supp I use 4pc 41 000 Mepco 50V capacitor and 2 transformer 27.5--0--27.5 265VA each which give +/-40 after rectifier.

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Old 26th May 2008, 02:26 AM   #205
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Got it. Thanks
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Old 26th May 2008, 03:00 AM   #206
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I found that amps on Ebay, US$59.99 per pair are an good price?

i want to purchase some of these boards
i have GB Amp, and lm3886 amps, this will sound better?

Thanks in advance
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Old 26th May 2008, 10:02 PM   #207
cdswift is offline cdswift  United Kingdom
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Default This amp is brilliant

I have just finished assembling a pair of these amps into a case with a decent pair of unregulated psus. I can tell you these amps rock - deep tight base, controlled mid-range and sweet highs. I have a pair of lm3875 amps and the nap 140 clones beat them. I also have a pair of JLH 75W amps and these are as good - maybe better when they are run in. If you are undecided, don't wait any longer - build a pair.
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Old 27th May 2008, 01:45 AM   #208
john65b is offline john65b  United States
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A dumb question for you all.

Fitted with a 40VDC dual rail power supply, what is the rated output? I have heard from 60 to 120 wpc at 4 ohm. Can someone verify the output?

Is 40VDC max voltage for this kit? And is it for max voltage for 8 ohm or 4 ohm? I have many 600VA toroids that are 40-0-40 (+/-56VDC), but would have to buy a 28VAC for the required 40VDC supply. Any advice on VA rating too?

Got my kit, unfortunately moving across the US in a few days, so she's all packed away.

Looking forward to see what she can do against my Krell KSA-50 Clone, UCD400, ESP P101, Aleph 60 (still not done yet), a panny XR45, and a few LM3886 Gainclones.
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Old 27th May 2008, 02:18 AM   #209
john65b is offline john65b  United States
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I am also reading that with the 40V rails, the max recommended bias is 6.6mv max, which is 30ma current through the output transistor. With this bias, the dissipation to the sink is only 4.8watts.

If this is correct, theres not much sinking required (someone check my work please).

Is there anyone who has biased these kits higher? I am not going to say bias it into class A, but could this amp sound better with more bias current?

I would think most components in this kit would be able to handle quite a bit more than 30ma.
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Old 27th May 2008, 05:16 AM   #210
Kan is offline Kan
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Quote:
Originally posted by john65b
A dumb question for you all.

Fitted with a 40VDC dual rail power supply, what is the rated output? I have heard from 60 to 120 wpc at 4 ohm. Can someone verify the output?

Is 40VDC max voltage for this kit? And is it for max voltage for 8 ohm or 4 ohm? I have many 600VA toroids that are 40-0-40 (+/-56VDC), but would have to buy a 28VAC for the required 40VDC supply. Any advice on VA rating too?

Got my kit, unfortunately moving across the US in a few days, so she's all packed away.

Looking forward to see what she can do against my Krell KSA-50 Clone, UCD400, ESP P101, Aleph 60 (still not done yet), a panny XR45, and a few LM3886 Gainclones.
NAP140 (140 = 2 X 70W)!
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