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Old 30th May 2003, 06:15 PM   #31
Duo is offline Duo  Canada
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Hmmm, Interesting ideas. I think I'll stick to my own design. I'm happy with it. I think for now I'll just use the 5 pairs of motorola. That'll still get me into 1000W @4ohms which should be plenty for our rental house. I mean, how much SPL could I need? lol.

I do see that the frequency of the Motorola devices is lower, but they are more linear. They should work fine in audio if I have sufficient drive current...
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Old 30th May 2003, 06:20 PM   #32
HighTec is offline HighTec  Croatia
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Hi Duo.

Ok,after all this is your choice!
Cheers friend.
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Old 30th May 2003, 06:29 PM   #33
Duo is offline Duo  Canada
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Well, any opinion? Do you think that the Motorolas will sound good in an amp designed around them??
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Old 30th May 2003, 06:52 PM   #34
HighTec is offline HighTec  Croatia
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Hi.

Well,I didn't say that Motorolas is a bad choice and a matter of fact I would be very happy with them.But if I have to choose between them I would choose Toshiba's.For a example:
I've built two identical amps with different output transistors.The
difference was obvious.The Toshiba transistors sounds better!
Some of my local experts agrees with me.
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Old 31st May 2003, 12:14 AM   #35
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You can very easy get 1300W on 4 Ohms load with only....6 pairs of 2SC5200/2SA1943.
In bridge mode you can get 4000W/4 Ohms load!


lol

That means the amp can handle
2 ohm load (non-bridged) if 4 ohm bridged.

It common to see exagerrated claims.
I can run my Adcom 555 bridged
@ 1 ohm load ! Only if I run an array
of tweeters, trying doing this with
woofers operating at low frequencies
and "yikes".. nay worky... barf.......

Nobody knows how ratings are established, did they measure 4kw
for 1 second or did they run the amplifier at 4kw @ 1khz ? From
the looks of the spec sheet, they
used 1khz... boring!

Did they run the amplifier all day to see if it's stable ? Try running those 6 pairs at 20hz driving 4 ohm woofer array and see if it likes it.



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Old 31st May 2003, 07:11 AM   #36
HighTec is offline HighTec  Croatia
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Post To be or not to be...

Hi.

These are factory specs.I didn't made them up.We all know that these values are for marketing reasons!
Of course it's not recommended working on 4 0hms in bridge mode!Probably they measured this in a short term.But...as you see,amp can deliver 2600W at 8Ohms bridged.I think this is quite enough
After all,I'm finishing the PCB soon and I will perform some hardcore testings.
Regards.
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Old 31st May 2003, 08:21 AM   #37
HighTec is offline HighTec  Croatia
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By the way folks here are some usefull things about power ratings:

http://www.polkaudio.com/home/faqad/...cle=pwrratings
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Old 1st June 2003, 12:50 AM   #38
Duo is offline Duo  Canada
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Well, in the general opinion, does anybody else have more opinions on the MJ21193/21194 transistors? Test results? Preferences? Does anybody think the Motorolas are a good choice for a high power class AB amp?
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Old 1st June 2003, 09:15 AM   #39
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Number one, the QSC has 47V, 94V, and 141V with six 30,000F caps per channel. Without these there is no way 6 pairs of plastic transistors will do whatever this thing is rated at.

Did you look at those four 52A rail switches, all the floating supplies for the 311 comparators? For each channel? Ignoring the low current supplies, this thing has 6 high current bridge rectifiers and 24 pcs of 15,000F filter caps. Have fun getting the transformer made.

Unless you do a multi-tiered supply, bridge amp, or a fully regulated supply, there is no way to get 1000W/4R from a 200V transistor.

A Crown VZ5000 does 2000W/4W in stereo, and can drive a 2R load if needed. All that is needed is a 55-0-55V transformer, one bridge rectifier, and one pair of 10,000F/100V filter caps. It is a bridge design, as most Crown amps are, and uses four pair of MJ21193/94 per half; eight pair per channel total. These are USD$2.00 each. The Crown uses one rail switch per channel as contrasted with the four that the QSC uses.
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Old 1st June 2003, 11:24 AM   #40
Duo is offline Duo  Canada
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Cool, that Crown design is very much like what I was planning on doing. My transformer is exactly 55-0-55 VAC and I have the recifiers for it, and caps. How much power do you figure I'd get running one channel (not bridged) with the 55-0-55 tranny and 5 pairs of MJ21193/21194??
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