I stand corrected. Please excuse an ex-wino's memory.
It was a long time ago but I do remember going back to the merchant and buying every bottle he had though it was the most expensive bottle I'd bought at that time.
I see La Mancha is a large wine region so ignore anything I said about it
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The late 70's must have been good times for reds; my most memorable red was a Mudgee Huntington Estate Cabernet, from that period -- yes, very local, and at a very reasonable price in a restaurant of that town no less, but especially notable because it instantly converted my wife into a red wine lover. Having a Grange some years later was a bit of letdown in some ways, after all the hype: you could taste the quality in the Penfolds wine, but the Mudgee effort was one of those "you can't imagine it getting any better than this" experiences ...
Frank
Frank
Will do that tonight, but mind you, PNP transistors (I think) will show up-side down, 'cos I use my own simbol, so you need to correct this.
Also, if you like numbers and low current consumption, go for discrete AD797 with J-fet input, it's a masterpiece (thank you Scott
.For French Burgundy, 1969, 1970, 1971, and 1972 was an almost unprecedented run of quite decent to very nice vintages. I'm not sure about the rest of the world.
I love the exceptions to the rule, and the "how could it get better than this" experiences. I cherish the folks I converted from "don't pour anything special for me, I just don't appreciate it" to solid wine aficionados. Particularly with reds.
1976 Rumier Bonnes Mares
A 1976 Rumier Bonnes Mares is a really rare piece of wine! Priced at around 450 USD. Heck, I can get me a short for that price
Was it still OK and not too oxidised?
20 years ago i dreamed about drinkng a Romane-Conti from domain Romanee-Conti but today I have given that dreamp up ...
/S
A 1976 Rumier Bonnes Mares is a really rare piece of wine! Priced at around 450 USD. Heck, I can get me a short for that price
Was it still OK and not too oxidised?
20 years ago i dreamed about drinkng a Romane-Conti from domain Romanee-Conti but today I have given that dreamp up ...
/S
Attachments
Never give up, although it's true that for most of us, the only chance for such will be due to the largesse of a very rich friend, or at least a collector who got started very early in life.
A 1976 Rumier Bonnes Mares is a really rare piece of wine! Priced at around 450 USD. Heck, I can get me a short for that price
Was it still OK and not too oxidised?
20 years ago i dreamed about drinkng a Romane-Conti from domain Romanee-Conti but today I have given that dreamp up ...
/S
Brad is right choose your friends wisely, I think the $29.95 tag was still on the bottle. Also choose friends that are brutally honest and don't worship what they love. The wine was in perfect condition but I find Roumier a little too "polite" for me. I drank it anyway.
The 70's were 50/50 you also have 1973, 1974, 1975, 1977, 1979 where the 1977's were scandalous (should have been distilled). I tasted the DRC's on release and those around the table were in disbelief (they ended up all being recalled). This was the end of the way it was, global warming (they say) is now making all vintages marketable, right.
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There were several until Hollywood released 'Sideways' and screwed my happiness. Now the total number of US-imported cases of French Pinot Noir is 100x the official numbers of *all* production of Pinot Noir in France.
Do the math, most of the stuff is likely to be Syrah-Merlot rebadged as Pinot Noir - most sheeple can't tell the difference. Real Pinot Noir has a distinctive steely edge in the finish - a bit like licking antique ironware.
The 2-buck *real* Pinot Noir, but grown in Coastal CA or OR, was Nathanson Creek, available at Safeway. That's one of several inexpensive gems from the US that I miss in Bangalore; Ghirardelli chocolates are another.
But Sideways did make many fine Merlots more affordable
No effect on top-notch Pomerol or Saint-Emilion however.Yup, the great Bordeauxs were never sold as Merlots or even listed their varietals on the label. Not that it would have mattered, a great vintage is a great vintage, regardless of the varietals. 'Sideways' probably killed the lesser California Merlots, and made some better ones affordable.
Bob is a regular contributor here.
He might even be reading along in this thread.
But his amp is at http://www.cordellaudio.com/papers/MOSFET_Power_Amp.pdf
Hope this helps
Back to circuits. Just fired up the output stage only, I want to measure its open loop THD, etc. That's from the two transitors whose bases connect to the VAS to the output. No matching, 4401/4403's right out of the bag 1% RN55's and no bias trim for now. I built my board with no thermal considerations yet either.
On +-15 fired up at 27mA and crept up to 28mA this will come down with trim. The offset was only -0.0021V. I will be doing the measurements over the next few days. I will be looking for the openloop distortion with and without a large source resistor.
On +-15 fired up at 27mA and crept up to 28mA this will come down with trim. The offset was only -0.0021V. I will be doing the measurements over the next few days. I will be looking for the openloop distortion with and without a large source resistor.
Also, for kgrlee and anyone else, just to say I'm still working on the "more accurate" spice model of BF862; the curves for drain current vs. both gate-source and drain-source, typical case look pretty reasonable; requires a subcircuit definition to work at the moment.
And, plugging it into SW-OPA on a first attempt causes barely a ripple: yes, the quiescent currents were thrown out of kilter, but after adjusting the appropriate R's to close enough, the 2nd and 3rd harmonics for 20KHz, 10Vp-p, 100x gain had changed by less than 1/2 db ...
Frank
And, plugging it into SW-OPA on a first attempt causes barely a ripple: yes, the quiescent currents were thrown out of kilter, but after adjusting the appropriate R's to close enough, the 2nd and 3rd harmonics for 20KHz, 10Vp-p, 100x gain had changed by less than 1/2 db ...
Frank
After initial excitement on your advice to twiddle the 20Rs in the output stage, I found that this didn't help things at all.
Twiddling the 250R for offset as you recommend is definitely less twitchy than twiddling the 30R source resistor. But still more twitchy than twiddling the current mirror in a 990 type circuit.
I think it will be wise for anyone doing PCBs to make provisions for a twiddle pot on the 250. Don't think we can match FETs accurately enough.
Frank, can you post your models?
So far I've been impressed by LTspice. It seems to at least qualitatively behave as I expect real life even if I don't take the numbers as Gospel. But I don't believe the input stage at all as swapping between all the models I have for BF862, J305, J111, 2sk170 doesn't seem to make any difference on these amps.
myhrrhleine, thanks for the link to Bob's stuff.
sonitus, thanks for your SPICE files
Brad, Scott & co., I don't see how yus guys can keep good wine for so long. Surely you can find an excuse to broach a bottle.
lee sipping his meths in Cooktown ...
Can do, but be warned this has only had a rough first check - no guarantees in other words!
Note that this is a subcircuit - even though the icon is the same you need to replace the JFETs with this identically shaped item; give us a yell if problems ...
The results of modelling are only as good as the accuracy of the models; the more you add all the little parasitics and what have you the more real info you get from the exercise.
Cheers,
Frank