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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Today I was reading Jim Hagerman's interview about his Trumpet phonostage and learn that he uses LCLCRCRC filters for B+ in his design. I certainly do not question Jim’s decision; in fact I never heard this phonostage, but I would like to comment, co...
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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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Here is another question that almost from the DIY-Audio universe. Dima is finishing Zaratustra II amplifiers. It will be quite interesting beast and I’m slowing begin to think about the power supplies – it will be my responsibility. The Zaratust...
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Hagtech, why not??? VR's are sensitive to parallel cap, as they have intrinsic esl (few mH). choke will increase the ac regulation.Of course it must have enough DCR (or R in series) to give the static voltage drop (giving e.g. some trace of line regu...
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I made today a bunch of experiments with shielding of the MF filtering choke and I have very good progress. I was talking with different people and had a number of good advises (Come one, people the ward “advise” must have a plural form!) The in...
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Dominik. There is one more factor that I forgot to mention. When you will be looking at your choke for your B+ of the output stage then relate it critical current to the amount of the mA that you asked the Tribute guy to guy your transformer. If Trib...
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Had a small amount of free time tonight. 150vac secondary, fred, 100uf, 500r, 1000uf, 30k, 5k, (like melq schema 4.4) no load voltage(b and c test point with no gas tube) 226.2vdc both lines. secondary is actually putting out 171.6 so 226.2 makes s...
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[quote user="FJC Corpas"]... but I like the way the current flows in a LC filter, smooth and steady.FJC[/quote]...modulo ringing of the choke at switching! the current waveform in the input cell of my PSU is an incarnation of satanPS if you want to h...
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[quote user="Romy the Cat"]In my view the Ringing of chokes is a BS reason that was invented by manufacturers who do not want to spend money for input chokes. Any book has formulation to calculate the critical inductance and if you are meeting the co...
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Romy, Big thanks for your answers. But i've got another question :)You mentioned gas regulator as grid current "absorber".Very good point, because personally i hate to use resistor as a grid leak.Instead of it i'll use choke - almost with any tube, i...
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Dominik. There is one more factor that I forgot to mention. When you will be looking at your choke for your B+ of the output stage then relate it critical current to the amount of the mA that you asked the Tribute guy to guy your transformer. If Trib...
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[quote user="Romy the Cat"]3) There is a mistake in Milq circuit. The B+ of the driver stage has almost insufficient amount of critical inductance. It was because I drew the circuit having the Super Milq in my head where the PS was feeding 3 stages a...
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Last night I built an large and ugly mumetal sarcophagus around the Dave Slagle’s choke and located it a bit aside from the location it was before. The efforts killed perhaps 98% of noise. I did not have good mumetal cans but I have .004 sheet of...
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[quote user="Romy the Cat"]N-set, can you explain what you are saying? What kind ringing are you implying? Are you taking about mechanical ringing of the wire or about the after pulse ringing? [/quote]I referr to the after pulse ringing. The parasiti...
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Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to get hold of a scope to che...
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I was playing with new power supply over this weekend, trying to optimize everything. First I got rid of bleeders at all B+ - it has enough critical current with them according to my measurements after the bride. All supplies after the first ...
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Wait a minute ... will a choke input work with a gas tube as a load? The choke-rectified input is designed to work into a resistive type load, but basically acting itself as a voltage source, capable of psuedo regulation over a wide range of lo...
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[quote user="floobydust"] Romy,
As you're planning to run a 6K load, you can run less current without the transfer curve suffering as much. So, another shot at some numbers.... rather than use a RC setup to drop the voltage, Hammond (not my fa...
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(Romy feel free to move this post)[quote user="Paul S"]N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with sp...
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[quote user="Romy the Cat"].....the idea of the triangle horns with some kind of location of the drivers is what I was thinking as well. [/quote]Which kind of brings me to the thinking… if I do the triangular midbass horns then what shall I...
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Sorry I'm a little late here, but anyway... here's something that may worth trying. Apologies that I can't provide a schematic at the mo - I can sort this out later if you like. In the meantime, you'll need a pen and napkin to help visualise this:The...
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[quote user="hagtech"] Iwas going to ask you about that funny looking damping material. Then you explained it at bottom of post. Very clever to use mouse pads! Lately I've been using cork & buna rubber sheets from McMaster-Carr....
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[quote user="Romy the Cat"]In my view the Ringing of chokes is a BS reason that was invented by manufacturers who do not want to spend money for input chokes. Any book has formulation to calculate the critical inductance and if you are meeting the co...
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[quote user="N-set"]Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to ge...
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I made today a bunch of experiments with shielding of the MF filtering choke and I have very good progress. I was talking with different people and had a number of good advises (Come one, people the ward “advise” must have a plural form!) The in...
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Well, I normally use tube rectifier with my LC filters and, I don´t know exactly why, I haven´t had ringing problems at switching. I think could be tubes switch in a gentler way than silicon. I recommend you use an appropriated snubber circuit across...
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Hi,I have the phonostage with the similar schematics that Romy has.The power supply use SiC Schottky diodes in bridge and 15H choke load exactly like on the scheme in this thread.Is it possible to bypass each Schottky diode by 10-100 pF capacitor?Doe...
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If you are going to use an LC filter, be sure that the choke has a big enough gap that the L does not change across the line level voltage range. Specifically ask Sowter about this. For instance, the choke I spoke to you about changes from 2.8 Henry ...
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[quote]a sufficiently-large last capacitor with using in input choke make the sound or transformer, rectifier and choke less relevant[/quote]I have to agree with Dima. The power supply has to be harmonious with the amplifier yet separate at the...
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Here is another question that almost from the DIY-Audio universe. Dima is finishing Zaratustra II amplifiers. It will be quite interesting beast and I’m slowing begin to think about the power supplies – it will be my responsibility. The Zaratust...
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