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Read the Post in new Window Read the Post in Threaded view  Post #51: LPad in Channel F by anthony on 2015-08-08 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
Hi Romy,I am calculating crossover scenarios for the HF Channel (Channel F) and am hoping that you can remember a reasoning for using a 20K LPad instead of a larger value such as 30K or even 50K?  As the larger impedance is used the value of the capa...

Read the Post in new Window Read the Post in Threaded view  Post #8: CR vs. LR low-pass filter. by Romy the Cat on 2008-06-08 
Browse the content of the threads in new Window  Thread: Rohde & Schwarz EU-6201 Tuner in Off Air Audio  34 Replies 
The precision of those inductors is very much irrelevant – it would be easy to fine-tine the filter with the value of the resistor. There is a bigger fish to fry – the benefits of LR filter. If we are taking about high-pass filter then there are no ...

Read the Post in new Window Read the Post in Threaded view  Post #27: Circuit. by Merlin on 2007-09-25 
Browse the content of the threads in new Window  Thread: Devid Berning amplifiers: the anti-trnsformers frenzy? in Audio Discussions  45 Replies 
[quote user="drdna"][quote user="Romy the Cat"]David got rid of transformer and replaced it with a DC transformer, claiming that it is “better”.[/quote] And I should point out that not only is there still a transformer in the circuit, but many other ...

Read the Post in new Window Read the Post in Threaded view  Post #52: It does not matter. by Romy the Cat on 2015-08-10 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
[quote user="anthony"]I am calculating crossover scenarios for the HF Channel (Channel F) and am hoping that you can remember a reasoning for using a 20K LPad instead of a larger value such as 30K or even 50K?  As the larger impedance is used the...

Read the Post in new Window Read the Post in Threaded view  Post #519: PP2000 buzz by Bill on 2010-04-30 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
One opf my amps buzzed when connected to the Pure Power but it was due to the fact that the manufacturer forgot to laquer the lams on an inductor.Have run bot my and Romy's units up to 100%, and even shut down Romy's unit overdriving it with as Crown...

Read the Post in new Window Read the Post in Threaded view  Post #44: Headphones... by Paul S on 2010-11-03 
Browse the content of the threads in new Window  Thread: To drive the 6C33C... in Melquiades Amplifier  65 Replies 
I don't know the 6336, but EL34 used correctly will sound like its driver tube, not to mention the comparative ease of PP scheming.  Sure, you need the voltage; but this to me only underscores the low ESR angle.  And who needs an inductor/transformer...

Read the Post in new Window Read the Post in Threaded view  Post #41: Do not repeat my mistakes and let keep the cartridges out of it. by Romy the Cat on 2007-05-06 
Browse the content of the threads in new Window  Thread: RAAL “Water Drop” tweeter for Macondo. in Horn-Loaded Speakers  77 Replies 
[quote user="Paul S"]Based on previous trials, I have avoided putting resistors on my new ribbons so far.  Finding decent caps and coils has been enough of a problem already, since everything comes through so clearly.  Maybe a variable indu...

Read the Post in new Window Read the Post in Threaded view  Post #39: 6-channels Milq: the design phase is over. by Romy the Cat on 2007-09-19 
Browse the content of the threads in new Window  Thread: 6 Channel Version of Super Melquiades in Melquiades Amplifier  131 Replies 
OK, it took for a while but at this point I have nailed down all design aspects of the new 6-channels Super Milq, and particularly its input stage. I have listen and evaluated all solutions that will be implemented in there; selected, appraised and o...

Read the Post in new Window Read the Post in Threaded view  Post #42: I LOVE #3! by Paul S on 2007-09-20 
Browse the content of the threads in new Window  Thread: 6 Channel Version of Super Melquiades in Melquiades Amplifier  131 Replies 
#3 reminds me of the HF-only naked ribbon, which seems to be the only exception, able to do this through a series cap.If you have the Mercury SR2-9013 35mm master Dorati/LSO Nutcracker, that might be a treat (if you can still do the Nutcrac...

Read the Post in new Window Read the Post in Threaded view  Post #7: Passive XO sucks, for sure (but I live with it). by Paul S on 2007-12-21 
Browse the content of the threads in new Window  Thread: The European Triode Festival’s horns in Horn-Loaded Speakers  57 Replies 
And there is no substitute for listening to it, no matter how careful the "calculations".  Anyway, I don't have it "figured out", that's for sure. Some guys figure in and use the inductor DCR in lieu of resistors (apropos), which seems clev...

Read the Post in new Window Read the Post in Threaded view  Post #9: The promising FM de-emphasis by Romy the Cat on 2008-06-10 
Browse the content of the threads in new Window  Thread: Rohde & Schwarz EU-6201 Tuner in Off Air Audio  34 Replies 
I think I found a good configuration for de-emphasis. The air caps will not work as there is nothing to amplify the capacitance. RC filer with cap to ground is good but I would like to have the entire de-emphasis with no capacitor at all, it will be ...

Read the Post in new Window Read the Post in Threaded view  Post #84: The Usual Snub by hagtech on 2008-01-08 
Browse the content of the threads in new Window  Thread: 6 Channel Version of Super Melquiades in Melquiades Amplifier  131 Replies 
Snubbers are more effective when there is no inductor - just a diode/capacitor rectification.  That's when they become useful.  To snub out the ringing caused by leakage inductance.  Keeps the "buzz" from coupling to other areas of the...

Read the Post in new Window Read the Post in Threaded view  Post #365: Ch, Ch, Ch Changes... by Paul S on 2010-10-07 
Browse the content of the threads in new Window  Thread: Macondo’s Midbass Project – the grown up time. in Horn-Loaded Speakers  455 Replies 
Bud, excellent footnote, and just the sort of thing I always find out about the hard way!  Still, the effing C hinge also "adjusts" according to R, while the shape of the curve changes as the L changes relative to the changing C...Sure, by all means ...

Read the Post in new Window Read the Post in Threaded view  Post #366: The sound of frying bacon.... on your forehead, under the tin cap........ by Bud on 2010-10-07 
Browse the content of the threads in new Window  Thread: Macondo’s Midbass Project – the grown up time. in Horn-Loaded Speakers  455 Replies 
LT Spice will also provide some of this operational modeling. I have not used Leap, but inputting variable states in LT Spice will provide you with all of the linear state information you could want. Naturally music has no linear states.....Putting a...

Read the Post in new Window Read the Post in Threaded view  Post #1530: Follow up on the core issues on tube SMPS by JOHNR on 2016-07-14 
Browse the content of the threads in new Window  Thread: It’s mad, mad, mad... electricity. in Audio Discussions  1910 Replies 
I did not follow up on the issues relating to improved performance on small smps when used on filament and DAC power supplies.Here goes:The first is that the source impedance of this type of supply is very small e.g. less than one ohm. The sp...

Read the Post in new Window Read the Post in Threaded view  Post #16: A "better" power supply does not necessarily need to be &quo... by rowuk on 2022-07-23 
Browse the content of the threads in new Window  Thread: CEC TL0-X: by no means an in-depth review in Didital Things  17 Replies 
Depending on the UseCase, many things can influence the sound. Rectifiers, snubbers, impedance, corner frequency, speed, an inductor in series, regulation, isolation from the mains grid all are parameters to consider.I do not know of any really serio...

Read the Post in new Window Read the Post in Threaded view  Post #102: Time for a break by Wojtek on 2021-11-17 
Browse the content of the threads in new Window  Thread: Remedies the Beauty in Playback Listening  293 Replies 
[quote user="Bill"]You had that glorious sound with the 40 year old caps in the B2's and the Tannoy crossovers. Do you really want to move away from what they produced in your system. A good way of testing new vs. old caps would be to replace the tan...

Read the Post in new Window Read the Post in Threaded view  Post #382: The fun time eventually. by Romy the Cat on 2010-10-14 
Browse the content of the threads in new Window  Thread: Macondo’s Midbass Project – the grown up time. in Horn-Loaded Speakers  455 Replies 
Eventually the Second Milq is converted to work with new room and new midbass horn. Not I have the complete Melquiades/Macondo setup that is more or less optimized to work in my need room. The Sound is very pleasant and not is the fun time starts. No...

Read the Post in new Window Read the Post in Threaded view  Post #152: On the Shoulders of Giants* by Paul S on 2010-05-15 
Browse the content of the threads in new Window  Thread: Romy The Cat's new Listening Room in Audio Discussions  478 Replies 
The thing is, other people have been here before, and between them they have already gotten results that would take most of us at least a few steps closer to verisimilitude. Sorry to be such a whore, but it just seems reasonable to make use of readil...

Read the Post in new Window Read the Post in Threaded view  Post #13: Clarification by noviygera on 2010-08-25 
Browse the content of the threads in new Window  Thread: Time alignment of drivers in Horn-Loaded Speakers  16 Replies 
[quote user="Romy the Cat"]Herman, I completely do not understand what you ask. The physical aligning of magnets is absolutely irrelevant. The crossover slopes are irrelevant. [/quote]OK.[quote user="Romy the Cat"]Why would you need to do switching b...

Read the Post in new Window Read the Post in Threaded view  Post #7: 1.5 order low passes by stuck.wilson on 2007-07-21 
Browse the content of the threads in new Window  Thread: First Order on Bass channels: Designed for Sound in Audio Discussions  16 Replies 
what a great idea-- i never really thought of a sort of 'low pass bypass' inductor of sorts?!   i'd always assumed that inductance was similar to capacitance in that regard-- the more you add, the more you get-- but hadn't thought about the...

Read the Post in new Window Read the Post in Threaded view  Post #17: Cruising around.... by chaos on 2008-07-04 
Browse the content of the threads in new Window  Thread: 60hz, GPA-515-8ghp horn... in Horn-Loaded Speakers  32 Replies 
i do it and i did it, but as a newcomer you have to sort out all the infos...not that easy! [quote user="Romy the Cat"](This is normal, I have written about it many times. Those large bass drivers have a lot of inductance in Voice Coil, the inductan...

Read the Post in new Window Read the Post in Threaded view  Post #2: What about memristors? by hagtech on 2008-09-07 
Browse the content of the threads in new Window  Thread: Correcting Filters and the quantum theory. in Audio Discussions  3 Replies 
My first answer would be "3".  But then I think some more...Is "A" really a shunt?  Where is the power dissipated?  Certainly not in the capacitor.  The signal is burned off (converted to heat) in the series element!  In circ...

Read the Post in new Window Read the Post in Threaded view  Post #1: Parts As Facilitators or Obstacles by Paul S on 2009-03-09 
Browse the content of the threads in new Window  Thread: Parts As Facilitators or Obstacles in Audio Discussions  0 Replies 
Another rushed post, thinking about Romy's "miles of wire" remark, germane to the giant Duelund caps.I have thought about this sort of stuff for some time, and I have come to the point where I tend to think of all parts as partly obstructive (sorry.....

Read the Post in new Window Read the Post in Threaded view  Post #9: Economic stimulus package for horn building hoodlums? by serenechaos on 2009-04-29 
Browse the content of the threads in new Window  Thread: The tapped horns: cons, pros and Sound in Horn-Loaded Speakers  57 Replies 
I do not know what is meant by “close bottom” or “open bottomless”-- please expound?I do not know of importance of enemys death to this topic. There is a long thread in the subwoofer section of "devil audio" about tapped horns.  John mentioned gettin...

Read the Post in new Window Read the Post in Threaded view  Post #343: Driver tube and biasing by cv on 2009-06-17 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
AlloOn the matter of the DHT having a plate resistance of 500-700... you do realise that running the 6E5p with an unbypassed cathode resistor is giving you an effective Rp of about 12k, right? The formula is, IIRC, Rp + (mu+1)Rk.Given that 12k seems ...

Read the Post in new Window Read the Post in Threaded view  Post #78: Re: quicker rise time with higher voltage by cv on 2010-02-28 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
I still say you will get the same "effects" if you current source a low voltage supply. Or, easier, put an inductor in series with the windings after your filter cap.The way I look at it is that the voice coil is the primary of a transformer; the cor...

Read the Post in new Window Read the Post in Threaded view  Post #81: More on the field coil damping - and an easy way to adjust it by cv on 2010-03-01 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
Hello chaps,Firstly, something I forgot before was that the high impedance coil will have more turns... so the DCR etc will be stepped down as seen by the voice coil. My guess is that overall it will still provide slightly less damping, due to imperf...

Read the Post in new Window Read the Post in Threaded view  Post #83: The high voltage input chokes and the snubbers. by Romy the Cat on 2008-01-08 
Browse the content of the threads in new Window  Thread: 6 Channel Version of Super Melquiades in Melquiades Amplifier  131 Replies 
Yes, Jim, thanks. It is what I thought. I have some “pure” ringing at 440V line as well. After consulting with 5 creditable people I desided to discard the problem. Since the choke on it’s another side gives a perfect sinusoid with no spikes or disto...

Read the Post in new Window Read the Post in Threaded view  Post #2: 1.5 order how to? by stuck.wilson on 2007-07-20 
Browse the content of the threads in new Window  Thread: First Order on Bass channels: Designed for Sound in Audio Discussions  16 Replies 
hm..lots of interesting information to chew on, and by and large, i've had similar experiences with first order crossovers on bass drivers .. this being my experience with a full range amp, and a two way system-- which is a far different critter than...
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