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Old 20th October 2006, 01:01 PM   #21
wputera is offline wputera  Indonesia
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Thank you Richie You're so kind.
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Old 20th October 2006, 03:00 PM   #22
quasi is offline quasi  Australia
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Quote:
Originally posted by wputera

hello quasi. keep your good work. i will build your quasi amp too with 5 pairs but i only have 45v-ct-45v 15A transformator, how many watt if my speaker 4 ohms and 8 ohm.

Quote:
Originally posted by richie00boy
Be around 400 watts into 4 ohms, maybe a little less. Probably about 220 watts into 8 ohms. 5 pairs of devices is fine for the 4 ohm load.

I don't think you will quite get that much power. Consider the following (with a big power supply).

45v - 1v(bridge) * 1.414 = 62.2 volts DC
62.2 - 5% (regulation @ full power) = 59.1v DC
59.1 - 6v (FET drop) = 53.1 * 0.707 = 37.54 DC RMS
37.54v into 4 ohms = 352 watts (still pretty good)
You should get around 190 watts into 8 ohms (also pretty good).

Cheers
Q
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Old 20th October 2006, 03:08 PM   #23
Did it Himself
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In my experience the 45 volt rating of the transformer takes into account the regulation, i.e. when it's fully loaded you get 45V, when it's unloaded you get 45V+5%.

@ DC RMS

Still, 350W or 400W, in practice it will be un-noticeable.
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Old 20th October 2006, 03:12 PM   #24
quasi is offline quasi  Australia
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True true.....I minused 5% at the DC point. As you say 350w v 400w = nufink.

Cheers
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Old 20th October 2006, 03:44 PM   #25
wputera is offline wputera  Indonesia
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okay Quasi n Richie, thanks again. do u have any suggestion a schematic pre amp for Quasi amp under developtment? I have 4 transistors 2sk 1058 without 2sj 162. How about replacing IRFp450 with this transistor? Or maybe Quasi have any idea about using 2sk1058 as N-channel amplifier?thanks guys
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Old 21st October 2006, 12:36 AM   #26
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I'd have to say Greg's SKA has easily the best schematic -

It's simple, symmetrical and delivers great all round performance and amasing sonics!

Look at the tests done by gapag and the reviews both here and elswhere. He could have taken this the exotic audiophile route but chose to make it available as a very reasonably priced kit to share with DIYers everywhere.

The GB300D will do 300W at < 0.025% efficiently using lower supplies and a smaller tranny than most.

And the sound - magnificent.
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Old 21st October 2006, 04:58 PM   #27
wputera is offline wputera  Indonesia
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how about this schematic ?
i think it is simple too. http://www.wdehaan.demon.nl/various/mjamp/index.html

But how to measure the bias?How many watt for 8 ohm load? What do u expect about this amp? Thank you guys.
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Old 27th October 2006, 11:17 AM   #28
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Quote:
I'd have to say Greg's SKA has easily the best schematic -
HiFiddle: I have never seen Greg's SKA schematic, could you enlighten us about it? Also would you be be so kind as to post the link to the review by gapag you mentioned, thanks.


Quote:
Cascoder: I DIG the handle. I am a fairly faithful cascoder, design wise, ever since I realized what it meant. Surely I'm pleased to make your acquaintance.
acoustixman: nice to make your aquintance also. Yes I am interested in emailing you to have a look at your schematic, but it seems I cannot email you due to "being under moderation".


Quote:
how about this schematic ?
wputera: yes a very simple schematic, looks alot like the Hiraga which you can find out about here:
http://www.tcaas.btinternet.co.uk/hiraga1.htm


Sorry to all if the above looks a bit strange....I haven't worked out how to place multi-line originals as a "quote", and i also havn't figured out how to include the original posters name ... sorry for any offence taken, certainly none was intended...
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Old 27th October 2006, 11:27 AM   #29
EUVL is offline EUVL  Europe
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For pure simplicity, I like this one.

Patrick
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Old 2nd January 2007, 11:48 AM   #30
birk78 is offline birk78  Norway
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For some reasons I'm not allowed to view peoples e-mails before I have written a minimum number of post. But I love to see acoustixman's schematic. So if you can mail it to me I'll be greatfull.

Tor Aleksander
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