Well , buy up some of those cheap MT-200's at digikey (while they last).
(below) that is the forums biggest symasym , you can set it up with
the MT's for 400 watts (OMG).
Had to cascode the original sym differential +VAS, and servo it to
swing 150V P-P.
"silly little amp" ? .... the original is very close to the HK680 , one of the best
reviewed <1K$ amps out there.
It was the last of my creations I built in july , I'm still liking it - MUCH !
OS
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It is the difference between art and Fine art. You have to know and appreciate the difference.
On the Bentley, a Grand Touring car, there is little to improve on in any area. Though people have modified the engine software for more power.
SOTA IMO means your very best effort and nothing, anywhere, can be improved further with existing technology.
Many cars are compared in stock form. But just as often done here at DIYAudio, individuals can improve HP or braking or handling performance on cars built to a price. There are many street cars built which out perform 'race' cars because they are not limited by any race rules.
The ZR1 was built in the Corvette plant. It had No parts used on a Corvette. If you look at the details, it is Fine Art. But, 3 days after I got it off the show room floor, I modified the supercharger and fuel maps for more power. Without traction control it was a seriously dangerous car on the street. I could never use the full power available without careful throttle control. After 12,000 scary miles, I sold it. 700HP and TQ.
Most things can be improved. I kept the CTS-V which uses the same engine as the ZR1 but a different cam. But still improved handling with some major suspension changes. Much quicker than the Bentley, of course. But I have driven it from Seattle to Sacramento non-stop (>1000 miles) and got out feeling fresh and not beat up.
Where is a best effort audio product? An all out assault on the technology and build quality? Was it a Blowtorch?
THx-RNMarsh
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The previous photo (replaced)with a 300V/us ND input stage = 1/2 ppm 50W -
really. 2nd harmonic = -115db noise is at the "floor" (>-120).
I'm using the symasym IPS ... but the board for the CFA needs improvement
before I use IT. It tests way better than a TMC "blameless".
Are you back , RN ? ... I still have that EF3 + a ND to send you.
OS
Simple IS good. The amp I pictured will work and sound VERY good with
33 - 100pF for the miller comp. quite a wide spread - but still stable with
absolute SQ. A design that can negotiate that is indeed far beyond a
"high end" design. To create this negates the "voodoo" that typical OEM's
thrust upon the masses.
OS
33 - 100pF for the miller comp. quite a wide spread - but still stable with
absolute SQ. A design that can negotiate that is indeed far beyond a
"high end" design. To create this negates the "voodoo" that typical OEM's
thrust upon the masses.
OS
No I am not back yet..... I look you guys up in between jaunts here and there. You can follow on FB.
I will be back in the US of the A's in the first week in November. Any time after that is fine for testing. Will they be in a chassis? Will they be attached to heat-sinks? Come with PS?
I now have obtained a 1 year visa with unlimited entry so I can wander in and out as I please.
THx-RNMarsh
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you will get about the same as the photo- heatsink w/ 3pair OP and the ND
input stage. I suspect your AP will have a hard time detecting ANY THD
10-20K. (maybe?)
My equipment falls short of detecting any thd (<-105db) on this IPS.
Operation wise , it is Tc stable 0 -40C , and sounds "pure".
You need the PS (+/- 50V) ... did you expect a whole complete amp ?
I'll test it with my 55V supply , then send it.
PS - I've seen a 400W clip on this Baxandall ,I can't understand why
"high -end" OEM's have not used this VAS on 3K$ amps yet - it is superior.
edit - why not this on any pass or parasound amp ? (below).
My tests show it to be quite unique .....
OS
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I just reduced bias and tested 1k thd. The oliver bias conditions do
not apply to fast CFA's and Japanese sankens.
OS
"A >200V/uS slew seems to error correct the AB X-over glitch "
My question was about that, not Oliver bias conditions...
The available NFB at high frequency can make optimal bias not so important, not Slew Rate.
Simulated two amps with same OPS (ThermalTrak), one VFA with quite high Slew Rate (more then 200V/usec) and one CFA with higher Slew Rate (abut 400V/usec) and very different Loop Gain plots. The VFA with high gain of 117 dB up to 1kHz but then goes down, and the CFA with 80 dB up to 20 kHz.
The FFTs with optimal and suboptimal bias shows that.
No SR is doing that.
Damir
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I found the same ;-)
Tried some explanations. No one is really convincing on an intellectual point of view. The overkill slew rate ? The expansive behavior ? Current on demand ? The little extended flat phase bandwidth in closed loop ?
One thing is sure (for me), CFAs sound more fluid, natural, easy listening, specially in the long run (less fatigue) than the same devices arrangements (same VFA and OS) in VFA.
May-I request international support against the fundamentalist horde of LTP's fundamentalists that will surely melt on me like a grasshopper's rain ?
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The bentley is a nice GT, but I can think of many areas it can be improved on. Running costs for a start! The Tesla is closer to SOTA than the Bentley. The last real assault on state of the art was the McLaren F1 from the early 90s from my perspective. Everything since has been too compromised. BUT Bentley sell on you feeling good driving it, even if the civic next you is doing the same journey in the same comfort in the same time for 1/3 the fuel. It is (like boutique audio) a lifestyle/willy waving thing.
I keep telling you to look at Mola Mola (molamola.nl) That is probably the highest performing audio equipment money can currently buy. No magic capacitors or fairy dust just the best that can be done with the technology. Won't impress the people who want 200kg power amps!
Not really.
Name one car brand with a built-in umbrella.
Best, no. Highest performance, no.
It's all about comfort, the best possible ride, the Connolly leather they used to have was something to experience.
(Once a year, there's a vintage RR&B tour through my street. I have espresso in the front garden, as I enjoy the ride. Call me cheap)
For the best performance ride, and record 0-60 time in a serial built, letter D
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