my problem remains that his usual bibliography contains 8 of his own articles, a couple by Hawksford, and maybe one or two by Otala.
A disease often observed in authors from IBM, and also Texas Instruments, who submit to IEEE JSSC. As a reviewer I roasted their ahszhesses dozens of times, regrettably it sometimes had little effect (except rejection of revised manuscript).
The 797 bears not even the least similarity to the 5534 BTW, well it has an input and an output.
The 5534 is a very good Swiss knife OMHO. And can drive lot of loads thanks to its current capability. It measure quite good as well. (some IC, now achieve incredible signal/distortion+noise ratios [Thanks Scott and few others], so why bother with old dinosaures ?).
The only problem is I always funded it sounding a little DULL. I don't know why.
Let-say it is a very good Pick-up, some should prefer super cars.
I used so many TL072, at a time, that I would have a bad time saying bad things about it. Works OK very few bucks. In some applications needs sometimes an output buffer.
I cannot understand why JC is so crossed against integrated circuits. They are everywhere and it is hard to live without.
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Well, there are Kings, but in the end there can be only ONE Emperor...Hum.
Ruppert Neve must be turning in his grave.
No shipping from Thailand yet?
I decided to leave them in Thailand and listen to them there.
You remember I also live there, own place there and have retirement visa there?
-RNM
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T, I use IC's, even the 5534 for my cheaper stuff, but I always seem to be able to make something better from discretes, especially with jfets. In 1978 or so, I carefully compared the 5534 with one of my studio quality discrete op amps and heard the difference. I even wrote up the comparison in TAA, back 40 years ago. I WANT IC's to work perfectly, that is the problem. They don't, at least for audio.
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Why? You forgot one detail I pointed out yesterday, designing an amplifier for a fixed application the designer has the freedom to change the compensation to suit the closed loop gain and now the BW does not change.
yes, I agree in that sense.
I have offered scholarly reading material/books that covers CMA in great detail over at the C vs V mode and what it means. I am doing as simple a comment here as I can. I refer all to my suggested reading to that forum, pls.
THx-RNMarsh
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Ebay currently has a listing for the MPQ6600a matched complimentary package Richard used as a compromise for the discrete matched transistors for his line amp. The listing states their from the late James Bongiorno’s personal stash.
(x2 PCS.) MOTOROLA MPQ6600A QUAD DUAL IN-LINE SILICIN COMP. PAIR TRANSISTORS | eBay
(x2 PCS.) MOTOROLA MPQ6600A QUAD DUAL IN-LINE SILICIN COMP. PAIR TRANSISTORS | eBay
That was 40 years ago. What about now?T, I use IC's, even the 5534 for my cheaper stuff, but I always seem to be able to make something better from discretes, especially with jfets. In 1978 or so, I carefully compared the 5534 with one of my studio quality discrete op amps and heard the difference. I even wrote up the comparison in TAA, back 40 years ago. I WANT IC's to work perfectly, that is the problem. They don't, at least for audio.
Jn
T, I use IC's, even the 5534 for my cheaper stuff, but I always seem to be able to make something better from discretes, especially with jfets. In 1978 or so, I carefully compared the 5534 with one of my studio quality discrete op amps and heard the difference. I even wrote up the comparison in TAA, back 40 years ago. I WANT IC's to work perfectly, that is the problem. They don't, at least for audio.
Attachments
Error correction is another way to reduce distortion ---- one of many --->
View attachment Error correction in AB Amps.PDF
THx-RNMarsh
View attachment Error correction in AB Amps.PDF
THx-RNMarsh
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Monster Products back in the glory days before the economy was crashed..... distributed 2-3 channel power amps. I over-saw the design. So they are all CMA. Build by the same mob (yr 2003) who is making mine from Damir's design. A good deal if found on e-Bay. .003% THD +N at 400W/4
These below are THD and THD plus Noise data of Damir's. 2017 test. Single ended input.
2 Ohm load
View attachment CFA 2 Ohm.pdf
THx-RNMarsh
These below are THD and THD plus Noise data of Damir's. 2017 test. Single ended input.
2 Ohm load
View attachment CFA 2 Ohm.pdf
THx-RNMarsh
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Hi Richard,
I can see now clearly that your amps are CFA and used balanced to unbalanced converter and not mine small H-bridge board as I use.
Could you tell what balanced to unbalanced board thy used here?
Best wishes,
Damir
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Hi Richard,
I can see now clearly that your amps are CFA and used balanced to unbalanced converter and not mine small H-bridge board as I use.
Could you tell what balanced to unbalanced board thy used here?
Best wishes,
Damir
Hi Damir --
It is not a single opamp converter IC. Uses 2 CFA IC amps only/channel -- Better specs. My design choice for its use.
Keeping amp in CFA mode always when using single-ended input. The only input I use for home apps.
THx-RNMarsh
.
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I decided to leave them in Thailand and listen to them there.
You remember I also live there, own place there and have retirement visa there?
I don’t, i was out of diyaudio for 8 years.
But I thought you owe a set of these amps to Damir, the designer? Now I see he’s building his own.
I don’t, i was out of diyaudio for 8 years.
But I thought you owe a set of these amps to Damir, the designer? Now I see he’s building his own.
No, Richard owes me nothing.
Doug is a good guy, and has written a bunch of good articles, my problem remains that his usual bibliography contains 8 of his own articles, a couple by Hawksford, and maybe one or two by Otala. Smiles please!
Yes - he is tight with acknowledging his references.
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