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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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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 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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[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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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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[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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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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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="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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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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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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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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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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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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[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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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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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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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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(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"]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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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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[quote user="Paul S"]But if I leave them down for a while, it might take 4 or 5 hours for them to get good.[/quote]Yes, it is exactly it. It is OK during the winter - sometimes run the power amps for days, but during the summer to run all 12 Milq’s c...
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I've spent two more nights examining and fighting my ham (I'm vegetarian and I want my phono to be so as well).1) I did Romy's excercise with shorting the stages via a 0.47u cap to GND. Shorting the plate of V2/grid of V3 resultedin the biggest reduc...
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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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Joaco, thanks for sharing. We still do not know what make those units to sound to sound good, so in a way we are shooting in dark. I have no doubts that there is great number of commercial units out there, similar to APS PurePower, which might be su...
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I did not know that there are any modern V-FET designs. As I understand, the V-FET transistors were available in 1970-1980 and were not produced since there. From what I heard that the DIY people who try to do V-FET amps buy old Sony and Yamaha machi...
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