What about the new DX amp by Destroyer X?. Look promissing with low parts count and a range of options.
http://users.tpg.com.au/users/gerskine/dxamp/
http://www.diyaudio.com/forums/showthread.php?s=&postid=1180680#post1180680
Have fun,
Sam
http://users.tpg.com.au/users/gerskine/dxamp/
http://www.diyaudio.com/forums/showthread.php?s=&postid=1180680#post1180680
Have fun,
Sam
OzMike said:There was a list of reference amplifiers on a thread here somewhere recently where all the contenders were listed.
With 1.5ohms and low efficiency of the Apogee you would want about 20A current ability and about 300W for it to get up.
Mike
Woah - 300 watts? That's a lot of power!
The Leach sounds nice, except I'd prefer an amplifier with a smaller parts count - preferably using SMD parts.
Hi,
the standard Leach v4.5 uses 2pair of 250W devices.
It will not drive 1.5ohm reactive loads reliably.
The 3pair and 5pair that Jan designed can drive low loads if the design parameters are chosen to suit that duty. The 3pair of 200W To247 only just matches the 2pair To3.
I would be tempted to try twin pairs of drivers and 6pair of 250W devices for those killer speakers.
Anything designed to be reliable with Apogees will not be cheap.
the standard Leach v4.5 uses 2pair of 250W devices.
It will not drive 1.5ohm reactive loads reliably.
The 3pair and 5pair that Jan designed can drive low loads if the design parameters are chosen to suit that duty. The 3pair of 200W To247 only just matches the 2pair To3.
I would be tempted to try twin pairs of drivers and 6pair of 250W devices for those killer speakers.
Anything designed to be reliable with Apogees will not be cheap.
AndrewT said:Hi,
the standard Leach v4.5 uses 2pair of 250W devices.
It will not drive 1.5ohm reactive loads reliably.
The 3pair and 5pair that Jan designed can drive low loads if the design parameters are chosen to suit that duty. The 3pair of 200W To247 only just matches the 2pair To3.
I would be tempted to try twin pairs of drivers and 6pair of 250W devices for those killer speakers.
Anything designed to be reliable with Apogees will not be cheap.
Yikes!
Anything more affordable out there?
djk said:I have built the Leach with 10 pair of MJ15024/25 driving a 1 ohm ribbon with +/-80V rails.
Been running for over 15 years.
That'll do it!
Are these the real deal?
http://cgi.ebay.com/LOT-5-MJ15024-MJ-15024-TRANSISTORS-NEW_W0QQitemZ220017973226QQcmdZViewItem
I see the same Ebay seller is also offering 2sb649ac/d669 in lots of 50pairs, at full retail price or slightly above.Spasticteapot said:
That'll do it!
Are these the real deal?
http://cgi.ebay.com/LOT-5-MJ15024-MJ-15024-TRANSISTORS-NEW_W0QQitemZ220017973226QQcmdZViewItem
These are really good drivers and becoming more difficult to source.
Are they genuine?
You certainly don't need +/-80V rails for driving 1.5 ohm Apogees.
Even 250W would be plenty and that translates to +/-30V under load plus output stage losses. Then you do not need 10 pairs of 250W output devices, In fact you could do it with 4-5 pair of 10A devices at 50% derating. And your heatsinks wouldn't need to be so big.
There's no need to overbuild as 30V will drive you deaf.
Mike
Even 250W would be plenty and that translates to +/-30V under load plus output stage losses. Then you do not need 10 pairs of 250W output devices, In fact you could do it with 4-5 pair of 10A devices at 50% derating. And your heatsinks wouldn't need to be so big.
There's no need to overbuild as 30V will drive you deaf.
Mike
I saw lots of good stuff on www.41hz.com
I myself may take the amp-building plunge this year as well.
I myself may take the amp-building plunge this year as well.
try aussieamplifiers
hii
why not try av 400, av 800 etc
from www.aussieamplifiers.com
i hear some people build that amp
and aussie now sale the pcb too
with the crash prize
after that you can let me know
the sound
regards
hii
why not try av 400, av 800 etc
from www.aussieamplifiers.com
i hear some people build that amp
and aussie now sale the pcb too
with the crash prize
after that you can let me know
the sound
regards
OzMike said:You certainly don't need +/-80V rails for driving 1.5 ohm Apogees.
Even 250W would be plenty and that translates to +/-30V under load plus output stage losses. Then you do not need 10 pairs of 250W output devices, In fact you could do it with 4-5 pair of 10A devices at 50% derating. And your heatsinks wouldn't need to be so big.
There's no need to overbuild as 30V will drive you deaf.
Mike
Hmm....so, four output pairs into 2 ohms will work? Sounds good to me.
ruerose said:I saw lots of good stuff on www.41hz.com
I myself may take the amp-building plunge this year as well.
I'd use a 41hz kit, except none of them will deal with a 2-ohm load very well.
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