I started here a couple years ago and have challenged designers to do better. Always, poking and prodding. Based on my experience alone, I made a few comments that CFA is easier to get great performance. Those who took up the challenge has also shown that in their experience that is true for them as well.
In the past, I never said this or that amps sounds better... didnt do it with capacitors either..... the variations are too subtle and in many cases small. However, I have no hesitation about the sound of Dadod's or perhaps others if they merit it. I dont dish out such praise easily.
THx to all who have hung in and tried their best efforts. We all learn from the interaction/exchange process as well.
I am primarily a technical manager.... projects and people. Not the best designer or CAD user expert. So, I really appreciate the work and effort those who were challenged have put into this as a hobby. It is a fine group of people.
I just landed on Phuket island with my traumatized, beleaguered family (devastating earthquake) for some R&R for them. There are problems to solve re. amp design but some problems are more important than others in the larger scheme of things.
Stay in balance and enjoy the music.
THx-RNMarsh
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Nice book. 🙂
Many interesting small stories (how people behave and why) from academia, research institutes, corporations.
George
More singleton stories ?
Why not download a post-A50/'93/VFA Accuphase service manual from the web, and build a downsized version. For the <2009 A65 model, there's both SM and copycat boards of the CFA online.
(maybe up the quiescent current per device from 70 to >100mA, also raises gm-level above sucky grade besides your ears)
Why not download a post-A50/'93/VFA Accuphase service manual from the web, and build a downsized version. For the <2009 A65 model, there's both SM and copycat boards of the CFA online.
(maybe up the quiescent current per device from 70 to >100mA, also raises gm-level above sucky grade besides your ears)
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Nowadays, it's the sons of the farmer/Boere-Seun who change the world.
(farmer = most innovative)
Something to lose...
Thanks Howie, other things I wish folks would lose, the 20k OLBW, flawed arguments re slew rate, VFA vs CFA, PIM, "asymmetric" signals having DC,op-amp rolling, etc.
Thanks Howie, other things I wish folks would lose, the 20k OLBW, flawed arguments re slew rate, VFA vs CFA, PIM, "asymmetric" signals having DC,op-amp rolling, etc.
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http://elektrotanya.com/PREVIEWS/63463243/23432455/gas/gas_ampzilla_ii.pdf_1.png
Here is Ampzilla schemata
Godzilla was in Fukujima 4 years ago 😉, better you search for Mike Bettinger, he restores GAS Stuff, schematics ?????, Godzilla was PA Amp, but never 400 W / Class A.
We had Ampzillas for Disco's, and added huge fans preventting them exhausting the magic smoke, sometimes still thermal shut-off...
Here is Ampzilla schemata
Godzilla was in Fukujima 4 years ago 😉, better you search for Mike Bettinger, he restores GAS Stuff, schematics ?????, Godzilla was PA Amp, but never 400 W / Class A.
We had Ampzillas for Disco's, and added huge fans preventting them exhausting the magic smoke, sometimes still thermal shut-off...
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And are they really running 3904/3906 at about 1.2W? Methinks the notation that says all the Q are one or the other is a trifle off.
Dan Siefert told me once that Bongo could never get his servos to be stable.
A text is mentioned.
(there's a GAS page with schematics. Bit of confusion what the schematic Banat posted refers to, most composite amp articles stick it to SoG)
Schematic is accidentally downloaded by me from here ,by searching for substitute for one LT....IC video driver which I need for repairing of one old PC-CRT monitor .
http://www.edn.com/Home/PrintView?contentItemId=4408239
http://www.edn.com/Home/PrintView?contentItemId=4408239
The narrow view of the average audio engineer? There are probably still more 5532 based phono preamps sold than any single other. Care to take a look in a SOTA ultra-sound or CT scanner for 40yr. old chips.?
Yeah, biomed is Ioannidis' field, but the paper could have been published anywhere.
Yes, there are good reasons for the 5532/34 longevity. But it's just not glamorous anymore 🙂
Thanks for informations !
But I read somewhere that GAS-Godzilla amps was produced only in about 20 example or so , some variants was A(b) class ,and some was (a)B class , both with very high slew rate factor ( 600V/uS) and very wide BW , which indicates to me that those very rare GAS amps was probably CFA based .
Not a clue.
(on the other hand, my fully balanced phono with multi-p MAT02 for MC and multi-p JFET-can for MM, does multi-OPA6 of the fancy version in the computing stage)
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