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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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There is one thing I don´t understand:Why is David Berning using masses of low voltage rectifiers instead of one vacuum diode rectifier?By doing this he´s got semiconductors in the signal path....
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[quote user="N-set"](feel free to re/move this post to the electricity thread)As the power supply I'd regard everything from the power generator in the power plant down to the actual load.Why the power transformer should be the cutting line? I do hea...
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The “Enjoy His Music” published the old celebrated by many DIYers Herb Reichert’s article about his 300B amp ideas.
http://www.enjoythemusic.com/diy/0709/flesh_blood.htm
I read it before but reading it now, after a few years again...
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The differences between the battery operation and AC operation are to be expected.One case is isolated (hopefully) from AC, the other case is not. If anybody thinks otherwise,they are fooling themselves.The first question to ask is to MAKE SURE that ...
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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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[quote user="Paul S"] a maxed/modded Museatex iDAT-44+ DAC (adapted for battery power; no AC!)[/quote]
Yes, Paul it is good that you remind me it as I have been thinking about it for a few years and never put my hands on it. I am not a bit fun of ba...
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Yep, it looks, like very close to “it” design-wise. http://www.studiomaudio.info/loftinwhite.htmlIn the way this amp is one of the manifestations of Loftin-White DC-coupled but it has some own things. The driver stage is the Melquiades Tube to k...
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There is one thing I don´t understand:Why is David Berning using masses of low voltage rectifiers instead of one vacuum diode rectifier?By doing this he´s got semiconductors in the signal path....
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It only uses Cogent f.c drivers .Josh Stipich from Electronluv is the designer/maker of horns and amplifiers and Cogent role is secondary (my guess) . Electronoluv aproach is afected by Sakuma designs and using lots of transformers&nbs...
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Romy, I have not been following this thread very much andI'm probably too stupid to understand, but how comes that your power supplies with choke input, tons of quality uF + smart bypassing still make the electricity a concern?If you don't listen to ...
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[quote user="TonyB"]The differences between the battery operation and AC operation are to be expected.One case is isolated (hopefully) from AC, the other case is not. If anybody thinks otherwise,they are fooling themselves. [/quote] Tony, the fact is...
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[quote user="Alex Yakovlev"]Romy, would you mind elaborating on specifics of your power supply? My Bidat is going to John in a couple of weeks and I am finalizing my thoughts. Thank you.[/quote]
I do not have any “specifics of my power supply” as I ...
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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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R2 gets hot. I think I mentioned earlier that it will also be hot...it is dropping 250V and running 17ma which is a bit over 4watt. From memory, that tube should be biased to about 35mA.Bridge recitifiers will only really matter here if you are usi...
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I'm pathetically slow with my 834 clone, but that's what I am....Sorry for boring you but I treat this threat a bit like a blog on my "progress".I've tried to fight more with PS induced ham and interferenceby putting the PS transformers and HV rectif...
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Here is another, simplified assault after some rethink and PSUD simulations.Rectifier: 3x1.2kV SiC per phase should do the job, actually 2 would do, but I'd preferto be safe. Bridge I don't want, as there would be 6 not 3 diodes switching1750V. 1.2kV...
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(feel free to re/move this post to the electricity thread)As the power supply I'd regard everything from the power generator in the power plant down to the actual load.Why the power transformer should be the cutting line? I do hear your voice clearly...
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[quote user="Paul S"]But you aren't using the tube rectifier, are you?!?[/quote] Nope I do not. I cancel the contribution to sound from rectifiers and “sonic quality” of chokes by using substantial value of blocking cap that does not allow AC to go ...
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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...
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I read about the GU-81 penthode. It's probably a good possible solution, thank you.I haven't so much experience with penthode, from my very few experiences, I felt better with triodes (DHT or IDHT), so I prefer don't take any risk.I feel more and mor...
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Interesting, I had a prolong conversation last night with Kevin Tellekamp of the Silent Running Audio and we discussed my case. He proposed that the reason why my imaging was changed was due to the Super Melq’s powers supply in my nest stand do not s...
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[quote user="guy sergeant"] I've usually found valve rectifiers to sound preferable. [/quote]
For HF channels only. Still with shaft switch diodes and properly implemented input choke filters there is not advantages of tube rectification, quite oppo...
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[quote user="Paul S"]Romy, isn't this the first time you have tried the film caps for PS and the "ALL-NEW" "SUPER-SOFT" diode bridge? I would certainly go back to known quantities before I did or un-did anything serious. Not that I always...
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At this point I feel a little stupid saying that a nice stiff rectifier can help with the speed issues. I've had not trouble doing better than the Sovtek for rectifiers; even the old winged C Svetlana is better. I've had the best luck ove...
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It is only if you chose to employ tube rectification. Many people claim that tube rectification affects sound greatly in this or that way and they are right, it does. However, it does only because the circuit is designed to be affected by recti...
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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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Looks to me like the horizontal and vertical steps in the waveform are due to the diode switching. One diode turns off while the other turns on. Storage time on the diodes is normally short. But it depends on the test setup! T...
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Hi Romy
6CJ3 (or equivalent) is the one you want. Though I've not used them myself, I have pals who regard them highly, FWIW. It has an average current rating of 350mA, but don't forget that for a given draw on the supply, the average current throug...
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Hi Romy,I haven't measured anything I was just looking at the data sheet for the valve. I was hoping someone could explain to me how a device with that much distortion could be any good. I am quite interested to build a pair of these amplifiers to se...
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[quote user="kodomo"]the faint grunge I hear from the upper mid and treble ... It is an audible noise, it kind of buzzes...[/quote]Yes, that describes it. This is THE characteristic noise when there is a defect in the Pure Power unit. As far as I kno...
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