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Old 22nd February 2011, 10:19 AM   #91
just another
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Hi Meganinja, If you are in Sydney and you know which months/years the articles were in, you can pop into the State Library and make photocopies of the relevant articles.

They have archives of pretty much ALL Australian magazines. I did this to get the original articles for my Playmaster series 200 which only came with the DSE modified instructions.

Tony.
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Old 22nd February 2011, 10:31 AM   #92
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Quote:
Originally Posted by Meganinja View Post
Hi Everyone

I know this is old topic , but I need the article Of the AEM6000 poweramp to finish it after it stay in box deep inside the garage for .. say 20 years, to cut long story short , I 've built a number of AEM magazine in around 1988 through Jaycar Gore Hill, they were The digital era vifa 3 way speaker this done and still work until now, the pre amp used discrete component , and last the AEM 6000 power amp, but during construction of power amp i had kid .., then life become busy , woking working , pay mortgage ..the project were abandoned inside my bro garage , now kid grrow up, I have myself sometime to dig the pow out , but unfortunately i've lost all articles about it , anyone here can point me to a article about aem6000 power amp,I know it is old tech but i just want to finish it.
Your help is appreciated

Regards
Meganinja
Hey there, I have the full set of articles, if interested, give me a bit and I'll copy/scan them for you.
What state are you in ?
I'm in brisbane.
PM me your email and i'll get back to you asap
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Old 22nd February 2011, 11:40 AM   #93
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Hi
Thanks alot , Everyone here is very helpfull . It is over 90% completed , original heatsink , servo board ( but not connected ), and recenly just bought a 2N5565 to use with this .At least I would like to hear how it sound after a long time .

Regards
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Old 22nd February 2011, 11:46 AM   #94
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I'll dig out the scanner and see what I can get done tomorrow for you.
Personally think you'll be quite suprised at how good it sounds.
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Old 22nd February 2011, 09:32 PM   #95
suzyj is offline suzyj  Australia-Aboriginal
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Quote:
Originally Posted by David Tilbrook View Post
Hi Suzy,

I have only recently stumbled across the diyAudio forums and was delighted to see the various discussions about amplifier design.

Thanks for doing such a great job with my old 6000 topology.

cheers
Dave
It's my pleasure. It really is pretty-much the definitive latfet design, and I love mine to bits. They've been annoying my neighbours in both my loungeroom and studio for a good few years now.

Thanks to you, not only for coming up with so many wonderful audio projects back in the ETI and AEM days, but also for being one of the people who ignited the spark and prompted my career choice. I confess to having pestered many a newsagent as a kid, impatiently waiting for my ETI fix.

Cheers,

Suzy
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Old 22nd February 2011, 10:26 PM   #96
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I'm still using D.T's MM stage from February 1982's ETI

Click the image to open in full size.

And currently re-boxing my ETI-5000! I was in high school when I first made it, and wasn't too good with the cabinet cosmetics. I want to make it sexy now.

ETI was a great mag; I should say *is*, I still have all mine & do refer back to them on occasion.
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Old 22nd February 2011, 11:41 PM   #97
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Originally Posted by Old'n'Cranky View Post
Personally think you'll be quite suprised at how good it sounds.
Hi
Oh, I am very happy to hear this, when I built this I only base on the subjective opinions of the author ( DT ) and the Topology of the amp, and I haven't heard anything else due to very busy at that time , now it is time to complete it , thanks everyone .

Regards
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Old 22nd February 2011, 11:59 PM   #98
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Just playing with the scanner software, relearning.
unless you want each page at about 7mg !!!!!!
I think not
I'll email you each section/article as it's done........
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Old 29th June 2012, 12:02 PM   #99
owdeo is offline owdeo  Australia
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Originally Posted by David Tilbrook View Post
No, I never took the 6000 any further I am afraid. I got involved in a number of other projects, one of which I was thinking of updating and posting here in case there was interest in a FET preamplifier, but it is turning out to be hard to get some of the FETs.
Hi David,

Deliighted to see you on here. I'm another fan (probably of Suzy's generation) that grew up lusting after your amp designs. To this day I still think the 6000 is my favourite power amp and I too have some Renesas (Hitachi) 162/1058s stashed away and have been planning to do my own 6000 PCB layout as, while Suzy's version looks wonderful, I wanted to stick with the higher power and through-hole components. I must confess to really liking the sound of the 5000 too, though not as much...

The reason I'm writing is I still have the line stage of your UF 6000 preamp. I never really thought it was as good as the power amp, and not long ago I decided to see if I could work out why. I believe it is perhaps not as stable as it should be as it shows quite pronounced ringing on square waves. I found this both in simulation and measuring the actual preamp with a 'scope. I also discovered a track missing in one channel of the original PCB, which probably didn't help...

Anyway, I played around in spice with different forms of compensation and found the the best looking result by ditching the input compensation (1n8 + R) and instead slugging the next differential stage with a 68pF cap across C-B of each transistor of the diff pair. This seemed to tidy things up nicely in the real circuit, with no visible signs of overshoot or ringing on square waves.

Unfortunately this was very much trial and error on my part, I don't have the necessary skills and knowledge to really know if this method of compensation is optimum, but it does seem to sound quite a lot better now. I'd be stoked if you could have a quick look at my mods and see if you think this is really a good idea. I don't have the means to measure distortion, but it certianly looks very low in simulation. I've attached the simulation screen grabs and can of course send the files if you're interested. The waveforms look identical on the 'scope. Please don't feel in any way obliged though, you've probably got much better things to be doing.

Do you think it's still a topolgy worth playing with? Douglas Self and others seemed to have dismissed the differential VAS as flawed in their publications. I'm curious to know whether the FET preamp you mentioned is based around that sort of discrete opamp toplogy?

Cheers, and also many thanks for the inspiration,
owdeo
Attached Images
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File Type: png orig.png (63.4 KB, 125 views)
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File Type: png mods.png (67.3 KB, 111 views)
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Old 3rd July 2012, 05:08 AM   #100
amp_guy is offline amp_guy  United States
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Quote:
Originally Posted by Steerpike View Post
I'm still using D.T's MM stage from February 1982's ETI

Click the image to open in full size.

And currently re-boxing my ETI-5000! I was in high school when I first made it, and wasn't too good with the cabinet cosmetics. I want to make it sexy now.

ETI was a great mag; I should say *is*, I still have all mine & do refer back to them on occasion.
hey I still have that pcb, I bought it when I lived in Brisbane when I lived there back in the early 80's never did finish it.
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