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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Thank you Romy, that was very informative and instructive!I don't completely agree that OP is absolutely irrelevant for linearity.It can happen that some regions, under given design constraints, will not give "a proposer harmonic structure of
your s...
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[quote user="anthony"]I did finally manage to get a day and a half to make the second DSET operational but it refuses to bias correctly. I've traced the circuit a dozen times, checked component values, tried to find shorts, checked cap polaritie...
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Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the regulators. It mi...
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Thank you for your answer.If I understand well, In purpose to do something realistic and good sounding. I should use at least 2 amplifiers (one for high frequencies and the GM-100 amp for low frequencies) with a tubes active filter at the inputs of e...
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[quote user="be"]Thanks ml8, do you know how much it could swing before problems, either due to clipping or grid current?[/quote]
I would be interesting to know how much plate voltage (and power) 6E5P would have with no bias. If ml8 would promi...
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Adrian, Romy, (Dima), First, I most certainly agree that the textbook operating point for the 2A3 is not optimal and can be improved on, hence my own design from a few years ago. If you are sticking with a 2.5K load, you will simply not ge...
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[quote user="oxric"]Hi Romy,First of all, as things stand in the sketch, the mast sits atop the legs, a horribly precarious position given the weight that will be applied away from the centre of mass of the structure. This sketch is an early ...
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I am bit confused with that new report. Under no circumstance I would defense Pure Power, nor anybody want my defense, but the reports I hear juts do not makes sense. If look like Pure Power grade for extra 30% or 50% power with new units, I do not r...
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I am not so impressed bout BD Design speakers. I truly hated the BMS drivers that they use and I truly hate the network of the blabbering cretins that BD Design built around itself. Any single critical mentioning of BD Design lead to a sudden sho...
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Got today a December 2010 PS Audio Newsletter with an announcement from Paul McGowan:
“…So, in January 2011, we will release one of our secret projects that have been in the works for two years now, the PerfectWave P5 and P10 Power Plant...
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[quote user="Antonio J."]I suspect the APS does more or less the same that my friend proposed. It probably has a class D amp which makes some kind of PWM with a so so smoothing circuit, hence the tooth saw trace of the voltage line, some PS which pro...
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George,
I do not think that the 3 motors example of Clearaudio is applicable. Theoretically it correct and a single motor driving a platter coastally minor-swing it on it’s bearing. In realty the things are more completed. With enough mass of platte...
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Lx, I do not think that my any of my PP2000 or PP3000 were been modified by APS specifically to suit my needs/complaints. Well, I did complain if I see something that is not right but there were (to the best of my knowledge) not customization for my ...
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[quote user="KOTriode"] On dynamic, the 6C33C tube showed its ability to go deep in the bass on Ray Brown trio recording of Soular Energy which is excellent for a 15W SE , the 845 amp can do better, but not by much, but probably because of its 25W ou...
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After trying all the might be tried with 6C33C (measurement-wise) I concluded that I know that tube very well …in order do not test it. All that I do is taking a new tube, burn it until the start up current is stabilized:
http://www.good...
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I do not know why people go into low-sensitive loudspeaker and they go crazy in order push the last drop out of the class A2 operation. From a different perspective the Macondo’s woofer towers with 97.5dB sensitivity are low low-sensitive loudspeaker...
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Hm, I was playing with options to get rid the 3dB divider in the MF channel input and I realized that I was a moron somewhere. I was operating under presumption that I was getting 2V on the driver cathode in MF channel that made the swing voltage...
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[quote user="Romy the Cat"]Because GM70 can work in A2 class the ML3 has a very powerful high current-capable second stage (I do not know it they are 4 parallel 6H30 of some kind of composite follower) to be able to handle the GM70’s grid current.[/q...
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Actually I do not have the instability issue sorted out completely...I'm talking about circuit instability now, not the tube instability. Let us imagine all tubes are rock stable.As I see it there are at least two major sources of instability, in the...
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[quote user="drdna"]You want a suggestion for a good 2A3? Get Ricardo Kron's (KR Audio Enterprises) KR 2A3. Very rugged, overbuilt. There is no comparison between this tube and all other 2A3's, and I tried many of them. The sound is more dynamic, the...
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Rakesh, first of all I have expressed the same sentiments a few times before in this threw. Second, I have to admit that is other company would have the same problem with ratability and support as PurePower does then I would behave differently. H...
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[quote user="decoud"] In the EU it is easy…[/quote]
Well, I would like to pitch
one more complication that you EU folks might experience. I have a suspicion that
to swing 220V is more complicated using the class D generation then 110V. I
mean ...
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Okay... I also downloaded the original Milq SET amplifier PDF and have looked at it in detail as well as the 6-channel adaptation (DSET) and I understand where you're going with it... or so I think. In my particular situation, I've owned two pair of ...
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Continuing my observation about the Timbres and Audio.From what I said above it is very important to understand that Timbres in Audio are not the photographic density of the colors themselves but rather an ability of a photograph to differentiate...
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For the past few months, I’ve been looking for a solution to a problem – how to recreate through speakers the same sound that I get through headphones. Why did I embark on this quest? Well although I’m quite happy with my headphones, I miss being...
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[quote user="Amir"]I listened one time (just one time) to master tape (revox reel).micro harmonic was so better than dCS Elgar (digital source) and it was better in micro dynamic. i did not tested good DSD in a good DAC vs good analog but in micro li...
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[quote user="drdna"] I think this 2A3 must have a specific set-up to sound its best. You have not found it yet. To begin with and familiarize yourself with the sound of it, I suggest sticking with the topology that has been tested by amplifier design...
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In my post above I have mention that Srajan is in a way a brainless parrot that repeats the heard and has no ability of desire to understand what was the noise about. His comments that 6E5P and E810F are “close electrical” is a good indication how it...
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[quote user="floobydust"] One of the reasons I no longer use a tube tester. They make a measurement at a specific target operating point(s). You don't really know what it is, so what are the chances they will be close to your actual circuit opera...
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[quote user="op.9"] Amir wrote:I listened one time (just one time) to master tape (revox reel).micro harmonic was so better than dCS Elgar (digital source) and it was better in micro dynamic. i did not tested good DSD in a good DAC vs good analog but...
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