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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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So, it has been a while. I have DSET/Macondo in stereo now although there is still some work to do to finish it and tune it to the room. As discussed earlier in this thread I need a preamp with gain and the Placette is just not cutting it for me (n...
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One interesting thing about the inverter/battery is the constant AC voltage.My voltage is 122 volts 99% of the time with only a toggle up on the odd occasion and a toggle down on an even odder occasion.Since very few of us have power amplifiers with ...
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Who know how they die, at least I was not able to figure it out. The literature suggest that when gas regulator at the end of their life they stop regulate or maintain regulation but increase noise. I was not able to detect it.
I have many gas regu...
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Romy, I have some (strong) opinions on DHTs concerning filament supplies versus specific tube types. For virtually ANY 45 triode, AC is my preferred option. Still, not all 45 triodes will be acceptable for my use, hence weeding thru many of them to ...
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[quote user="Romy the Cat"] I do not really believe in the ultimate ability of SET amplifiers to drive loudspeakers, at least any loudspeakers. [/quote]Well - I've heard a couple of such amplifiers, made by Mr.Juri Makarov. They did have more o...
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Hello every body, I live in France and I'm new on this forum.I'm thinking to build (some months) a mono big Single Ended amplifier (200-300 watts) made with triodes (IDHT or DHT doesn't matter for me) for outdoor professional audio.Have you got an on...
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Well, David Berning is about as clever as they come, Merlin, that's for sure, and you don't hear David making a lot of claims for his gear. That whole step-up, HF PS/carrier idea is pretty cool, all right; I think Carver did one, too, year...
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DA, I would not use any switched power supply, not to mention that they do not need to be regulated for LEDs, relays and fans. I do not know if you build a full range Milq or more complicated multi-channel version. If it is a full range Milq with onl...
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Yes, there are some specific differences between how various manufacturers burned in their tubes and the initial firing of the tube and flashing the getter, etc. There is an interesting video of the old Blackburn Mullard plant here:http://www.techtub...
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A typical switching supply does not evenly load the input (sinewave) power source and can create some dirt on the AC line (Paul's "backwash" statement??). Depending on many variables, the amount of contamination the switching supply could contribute...
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Erik, I do not think a resistor in series would do as it will burn on itself some voltage and the coil will be driven by the same voltages. It would be good to put in place of the resistor a rheostat and to slide it up and down while slide up and dow...
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[quote user="KOTriode"] 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 reg...
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[quote user="Paul S"]Yesterday a nice fellow drove off with "my" Lamm ML2s. Now it is really sinking in: How will will I find anything else this good, along with more power?These amps were like a PhD in sound, what might be done with hi-fi. Yes, I ...
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decoud - thanks for the link, nice and minimalist,but as minimalism is no longer part of this project I need Unfortunately a more complex power supply.Romy -I'm building a full range amp. But...I need a small foot print so it will be high and relati...
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Over the course of the enter 2006 Dima and I were involved into the Zarathustra II saga. It took countless phone calls, countless emails, a lot of thinking, numbers of shipments and many hours for Dima and me to propagate the project to it semi-compl...
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Lots of good thoughts about grounding; thanks.But I am still left wondering how the same connections can sound great on one occasion and terrible the next.Like Romy, I ground my gear to a dedicated rod driven near the gear because the house/grid...
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Unless they are quite unusual I doubt your amplifier's output stage uses regulated supplies.My point was that PUREPOWER/Inverters, etc. deliver a far more constant AC voltage than the line and that this could be a reason people find them to be usefu...
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This is what I try to stick to: Try to create closed magnetic (steel) loops around magnetics. Ideally acompany itwith closed electric (copper) loops. This I think Pieter has done that already for you, but,as Romy impicite suggests, double boxing will...
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The weak bass of low-power SET amps is well known. I don't think anyone would disagree.Some reasons:Simple low power, especially with 93db speakers (try with 106db like Yorkville LS1208 horn subwoofer it might be different).SE output transformers hav...
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[quote user="be"]Hey. I have not seen it mentionned here, have you tried, or even considered regulated dc-current supplies for the heaters?Should have the sound quality of ac-voltage supplies combined with the lack of noise of the dc-voltage supp...
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http://www.purepoweraps.com/pdf/PurePower+%202000%203000%20120V%20Users%20Guide%20-%20August%202012.pdf
It looks like the new PP unit can output configurable 115V, 120V, 127V or 130V. That is very nice as it allow to bulk setting the pate ...
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[quote user="Thorsten"]
Romy the Cat wrote:
Among the imperfection I would mention the mains voltage fluctuation. It could be fixed only by regulation with all negative sonic consequences of regulation.I find this comment m...
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[quote user="Ronnie"]These millimeters will be fun to play with.[/quote]Ronnie, I know exactly how it sounds. As soon Sound hits a range of upperbass then the system sounds like somebody attached to the driver some kind of trammel. it feels as someon...
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Hi Dima,Yep, I really think that I get this one right: I never take the time to do any research about it until your posting came. Luckily, I got the clues in less than 15 minutes. If only other things can be like that...About VR tubes stability, now:...
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[quote user="Thorsten"]MY PERSONAL current realisation (where I to build one) would look like this:1) S&B TX-102 as volume control, with suitable switch2) 2V Lithium Battery negative pole to the grid of the Valve, bypassed with good non-magnetic ...
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[quote user="op.9"]I chanced upon an interesting PSU arrangement for my 5842. I run a valve regulated powersupply at 210v and then drop down to 160v with an un-bypassed 8uf oilcap. Any more capacitance or bypasses seemed to be a step backwards in ter...
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If i am not mistaken It seems Most High Power UPS in the market like APC or ABB are not good for high dynamic loads (high crest factor like Music signal) and the load transient response of these UPS is not very good at rated power. APC , ABB and ... ...
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Hi Jack ,Thank you for your very educational info ! It looks like you are right , and your tubes are rebranded SG13P .... Maybe a big stock of those tubes were exported , and you know them better than we do :-)And another question . You wrote :...
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Look at the solution in a different manner.Regeneration will typically not be able to service large power transients thus, they are best suited to SET, i.e. constant current systems. Similarly any control loop cycling will usually be heard...
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[quote user="Merlin"] Directly heated triodes …. It has fully regulated power supplies and absolutely zero AC filament hum. [/quote]
That bothers me tremendously is the half-ass approach of high-end products and the fact that for exuberant amount of...
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