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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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It would be you!I should have known you had researched this more than the posts revealed.I know I would not want to wrestle those drivers out of the attic, either. I figure you have replacements to use temporarily so you would not be without, but .....
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[quote user="guy sergeant"]I used to work for a valve amp making company and we had a little 2 stage phono amp that sounded far better than the 834 with passive eq, no feedback etc. It also cost less than the EAR.I can send you the schematic if you w...
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[quote user="mats"]Good start Dan!The JBL phenolic 2" driver is 2482.I would lower the crossover point as far as you dare, 300Hz or so.Now the 2226 will do what they are pretty good at.Later you will likely want to filter the 2445 around 2k.A 600Hz h...
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[quote user="hoan da ox"]Hello to all, After following the comments of Romy for some time (have learned a lot, thank you), I would like to ask a question on this subject.This circuit is built with resistors, diodes and capacitors. Could someone elabo...
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Wow, Bill, that sounds like a lifetime of work - and no rest - to me! Hats off again if you can listen for more than 2 sessions in a row without glitches! It has been over 20 years since I gave a thought to combining sight and sound systems. But how ...
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agh..well.. i can see that you'd never be over for a beer and listen session, romy! not that i wouldn't invite a curmudgeon such as yourself.. but my own system might not make the cut!i just finished off a little 2 way bms/altec system (and i d...
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This whole 833 A2 concept, given the constraints,is a no go. When driven positive, the grid equivalent resistance drops down to 1/transconductance level. For 833, being a high-gm tube,this can be as low as 100R. In order not to distort significantly ...
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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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hi Woitek. The K33 extend the bottom end by the high Q, to almost 40 cycles . Which is only ok if you work with passive XO on a single amp. Well that's how they were designed. Having designated amps that allow you to steer the parameter or even bett...
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Folks,A maker of Magnetics reading along has taken me privatly a little to task, it seems I was not clear enough with some of my statements, apologies.First, I seemingly stated that Amorphous material was "always iron", that was not my intention, amo...
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Hi,[quote user="Romy the Cat"]T, would you elaborate on it if you feel that it has any merit?[/quote]Really, I do not know. From my limited experience I have found that multiway active systems are very much a tuning excercise par excellance. Given th...
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Hi Cat. I run the 12AX7s just a hair over 1mA each, and the 12AU7s at 6mA. With differential pairs and bleeders, it ends up at 39mA on each +/-300V rail. That works out to 7H minimum inductance at 60Hz, using the standard formula.&n...
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I asked Dave Peck of Avid (formerly Euphonix) a few questions regarding the Model Two (otherwise known as the PMI). The responses he received from Keith Johnson (one of the original designers of the PMI, head of Reference Recordings and chief design ...
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Reading the title of the original post I was under the impression that a new product was out or discovered that was a computer based optical drive system with storage as it's secondary function but it looks like just another storage based system with...
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No matter how often I go through it I still frequently get confused and disoriented when tubes go bad. In this case I have been integrating a new (passive) pre-amp and a new (tubed) phono stage into the system, including trying various tub...
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[quote user="serenechaos"] I do not know of importance of enemys death to this topic. [/quote]
Oh, this is a sheer pleasure but do not call that dirt enemy. He is not enemy but way beyond it, he is the person about whom I have a death-wish as ...
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Ok, spent a half of the nigh to working with my IB problem
and discovered that everything that I do now is a complete mess.
First of all the crossover that I used is not what I though
it is.
I found my old there from which I learned...
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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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First: Good on you John, so few have spent any time on core material properties. I have developed a method for passive self demagnetization in E/I core. Works a charm except that higher perm materials become harder to drive and the driver circuit beg...
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Audio Sonar Acoustic Levelling (ASAL)
As an engineer, I’ve been intrigued by the various room treatment systems out there…most of which are sound (excuse the pun). My own 4-way front-loaded playback system is very dynamic…and suitable room...
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ML2 is also making me hear my modified AI M3A pre-amp, not to mention I guess I could now benefit from all shielded cables. All this stuff was fine with the Wright 2A3s. Speakers: I built a version of Dick Olsher's 3-way Diamond...
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Hm, it is complicated. In context of ported enclosure (or passive radiator) it is imposable to talk seriously about the box resonance as a speaker/driver has no own sound but rather a summation of zillion resonances, aftersounds and the rest dirt tha...
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The line level crossovers have some advantaged: they loaded into higher impedance and therefore the values of caps are smaller. Also the line level crossovers loaded against fix impedance, contrary to the speaker level and this allow writing a very e...
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You might change your mind after you put the PP2000 into the game. Anyhow, I do not know what Bruce did with his Titans tweeter; I do not even remember it they are in time-aligned position. The EdgarHorn Titans uses Fane ST-5022 bullet tweeter. I had...
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I must have missed out on how you regulate gain to or from each or any of several "channels"/pass bands, Romy. I can remember years ago trying lots of EQ things to get "Flat Frequency Response" and finally giving up on all of it, including...
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Two basic premises:A) The concept we all operate on is: a chain of components connected between one another that pick up info from a medium, transform the info into ac and amplify that info; then, we attach speakers to the last of thes...
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[quote user="Romy the Cat"]I do not think that my “resistance” to transformer preamplifiers” has to do with audio neutrality and particularly in context of “improved audio neutrality” as I do not think that neutrality might be “improved” (though it m...
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My room, is 16 to 17 feet wide, 27 to 28 feet long by 12 to 14 feet high with all walls splayed, with a combination of absorption and diffusion on the walls. All electronics are fed electricity by three pure power units originally recommended by Rom...
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Edgar, very very nice observations re the phase! Can you somehow share the movie? Shouldn't there be a second phase jump around Fs of the passive radiator?
Have you tried combining sealed subs running parallel with Dannoys? I.e. ...
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I think I get your message Romy, but offer an alternative perspective to DIY.The results depend on the motivation and expectations of the DIYer. For example, saving $$$ is one reason to start learning to solder and build simple circuits. ...
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