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Old 3rd April 2002, 10:05 AM   #11
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Old 3rd April 2002, 04:03 PM   #12
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Default Current-feedback amps

Built several permutations of the Alexander amp, and they all sounded like every other current-feedback project I've worked on.

As Mr. Horse would say...."No, sir, I don't care for it at all."

Can't describe it, but it just doesn't sound right. And everyone who heard any of them said the same.

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Old 3rd April 2002, 04:09 PM   #13
jam is offline jam  United States
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Do you have the conceptual schematic of the McCormack amplifier and could you share it with us?


Any suggestions as to why current feedback amplifiers sound bad?

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Old 3rd April 2002, 04:15 PM   #14
grataku is offline grataku  United States
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Yeah Harry,
these picture are all well but
when are you going to post something that is actually relevant to this thread and DIY in general?
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Old 3rd April 2002, 04:29 PM   #15
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Default aksa info

Originally posted by pmkap
The best kit amps I've heard is Hugh Dean's AKSA.
Does anybody else have more theory/objective/subjective opinions of this kit amplifier, and tweaks, or any other suitable types ......... Anybody ? ....... Please ! .........

Anyway Hello All, especially Harry, Bernhard, Sonny, Eric von Deutche, and the other intelligent, knowledgeable. and other fellow experienced contributors that I missed - I'm looking for some considered technical and subjective advice.

I'm looking for a MUSICALLY DECENT SOUNDING (for loud, good old rock and modern youngsters stuff) reasonably simple amplifier module design that is economical, quick, easy, reliable, sonic performance consistent and idiot proof for the application of a/several SERIOUS active multi-way, multi-driver, multi-cabinet loudspeaker system/s for hireable Function Room, Hall and Home Party DJ and maybe some Live stage PA usage. Phew.

I figure on reproducing the modern recently re-invented Line-Array way, only downsized a bit so that multiple cabinets can fit into standard motor vehicles.
I envisage each multi-active cabinet to deliver several hundred watts total into multiple paralelled drivers clean, so 4 ohm (or 2.6 ohm or even 2 ohm) loaded sonic performance is important. Likely 200W or so into 3 or 4 paralleled bass drivers for lows. Probably all drivers will be impedence compensated - I think this is mandatory and the cost is not too great.

Stacking (or hanging) multiple LA cabinets improves their cylindrical directional characteristic and their overall efficiency, and because they will be active and modular, total system max power can be easily definable.
My desired commercial angle is the bigger budget the hirer has, the more cabinets and the bigger, better and NICELY louder system they can get = The whole point of this eventually costlyish exercise is to result in a much wanted hireable REALLY good sounding replay rig, that on every old, or new, top 40 tracks gets the whole crowd up dancing and enjoying it.

I have spent a lot of time around a lot of gear from DJ to live pub/club to seriously big international touring shows.
Usually the first two sounds suck. The big unlimited budget pro tour stuff is GOOD, damm good - for example an AC/DC show stage system/pa system afternoon sound check can be quite interestingly educational ! .....ditto .... U2.... EJ/BJ.... MJ.... ND.... MC.... GE.... Kiss.... &etc &etc....
I also fix a lot of this pro stuff in my usually quieter repairs shop.

I'm also looking for any relevant pointers and opinions and experience and advice regarding sort of cost no object (within limits) longish line send and recieve stages, and LL crossovers / filters / eq / tone / dynamic range / limiting / enhancement etc.

I'm all ears ! Please feel free to giveyour advice freely.

Regards and thanks in advance, Eric.
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Old 3rd April 2002, 04:33 PM   #16
Join Date: Feb 2002
Location: Dallas,Texas
Default DNA225

I wish! My local dealer wasn't happy about me photographing the amp while he was on vacation and I was helping to mind the store! I believe it is a Toshiba Jfet diffamp front end with cascode and a Hitachi Mosfet gain stage. Maybe the mysterious Mr. S. N. in North Corolina would know. When it comes to amp design, he knows everything and I know the rest. Mr. S.N. are you reading this. I actually don't like to rip off commercial designs since it is the result of insane amounts of labor on the designers part to design it in the first place. I do pay close attention to part selection though! There are plenty of excellent DIY, amatuer, Pass, and Borbely designs to base a "guilt free" design on. An amazing amount of commercial designs are based on the work of Mr. P and Mr. B. The hard work and generousity of these two is unmatched in the audio world.

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Old 3rd April 2002, 04:48 PM   #17
tvi is offline tvi  Australia
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I found the luxman SQ-505X very nice, a little soft like most Luxman stuff I've heard, changed all the metal can TO5 transistors way before it became <font size="+3" color="#ff0000" face="ariel">THE LAW</font> Nice modular layout made moding easy too.

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Old 3rd April 2002, 05:07 PM   #18
tvi is offline tvi  Australia
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Old 3rd April 2002, 08:03 PM   #19
FBJ is offline FBJ  United States
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Hey are those bipolar output transistors or Fets?
I don't think I ever saw a bipolar output stage with out an inductor on the output before. I just learned something.
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Old 3rd April 2002, 08:58 PM   #20
Freddie is offline Freddie  Sweden
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Yes, bipolar output transistors. I've seen several amplifers with bipolar output stages without inductors on the output.

BTW: I did a little searching on the net, and the Luxman SQ-505X appears to be a very old amp, around 1968..
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