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Old 11th April 2007, 11:06 PM   #1
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Default Best amplifier for newbie?

I'd like an improvement on the Gainclone, but I don't have much cash, and zero experience. I do, however, have some massive transformers and heatsinks.

Any suggestions? I'd ideally like an amplifier that can cope with my 1.5 ohm Apogee ribbons.
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Old 12th April 2007, 01:42 AM   #2
djk is offline djk
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Build a Krell or Leach clone.
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Old 12th April 2007, 02:31 AM   #3
SamL is offline SamL  New Zealand
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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/showt...80#post1180680

Have fun,
Sam
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Old 12th April 2007, 03:48 AM   #4
bawang is online now bawang  Malaysia
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For a time-tested and DIY proven design, go with the Leach 4.5. Only problem is the relatively high component count and fiddly way to mount the temperature sensing diodes....
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Old 12th April 2007, 04:40 AM   #5
Nordic is offline Nordic  South Africa
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If all goes well, I'll be powering up a DX today.... first got to hang a door for the woman next door though....
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Old 12th April 2007, 06:47 AM   #6
OzMike is offline OzMike  Australia
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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
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Old 12th April 2007, 08:12 PM   #7
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Quote:
Originally posted by OzMike
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.
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Old 12th April 2007, 10:32 PM   #8
AndrewT is offline AndrewT  Scotland
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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.
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Old 12th April 2007, 10:40 PM   #9
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Quote:
Originally posted by AndrewT
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?
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Old 12th April 2007, 11:03 PM   #10
djk is offline djk
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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.
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