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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="Paul S"] Which caps exactly did you decide to try? I don't recognize the big black jobbies. Are they oilers? Are they 200V? [/quote]
I did not “decide” but went with what I had in my hands. They are the Ansars from the...
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I bought the Lundahl chokes for L1 and was not able to us them and they were insultingly sharp. For the L1 you would need more henries and more DCR, the higher DCR will sound better and the “bad” and “cheap” Hammond chokes worked very fine. You...
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Thanks, jk
I have given a lot of thoughts to this topic lately and have a number of conversations with various people about the subject. A friend of mine from Europe, who is currently at fitness protection program, suggested that:
“.. in my "real" ...
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[quote user="Antonio J."] I really can't understand how a company selling a power regeneration device priced well over 2000 or maybe 3000 USD could send you 5 units and being al them "defective". Did I miss anything here? [/quote]
Nope, you do not m...
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[quote user="hagtech"] Yes, steel chassis can be both good and bad. It likes to conduct magnetic fields, so you have to treat things appropriately. A little spacing under a choke can go a long way. Otherise you have a 120Hz motor.&n...
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Welll, you still did not express yourself what are the sonic verdure of DHT from your point of view. You are not obligated I juts proposed you to do it if you feel that have any observations on the subject.
[quote user="guy sergeant"] I started by s...
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[quote
user="steverino"] Later after the PP battery was replaced hum disappeared
forever.
[/quote]
Interesting. What made you
to replace the battery? The reasons I ask is a because an old buttery would not
be different for powers supply then ...
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[quote user="Romy the Cat"] ….when it drives what it is willing to drive then the APS PurePower delivers the Sound that makes me willing to write a request to Pope asking him to canonize that damn regenerator. [/quote]
[quote user="Romy the Cat"] To...
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I had some free time which I'd decided to waste with this "project".For some unknown to me reason (I'm an idiot when it comes to filters)the Sallen Key topology needed one more 12AX7 stage, unlikeI happily drew some posts ago. The resulting SPICE'd p...
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You might try the Foam Factory; they are easy to deal with, inexpensive, have online ordering, quick turn around and can ship anywhere.They are NOT a typical audiophile-oriented acoustic room treatment supplier. Nevertheless, they are equipped to cut...
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N-set, it is nice to see that you are keep punching the idea, somebody shall, I guess.. About the filters. For the low-pass and in this application I do not use inductors and much prefer RC filter. In LC filters the band-pass flows over coil. If we a...
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I already have some PY500 (it's a sign =))) ) and I have 836 too.I read about Malquiade amplifier threads.So it seem peoples on this forum like horn speakers (I love them too) and are looking for fast transient response, it's exactly what I like.But ...
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[quote user="decoud"]I am getting the components together for the full range version, and I was wondering if you would be kind enough to consider making available the drawings and the manufacturer for the enclosure. I rather like your design, a...
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The el`Ol’s comments about Cessaro did not find a proper electronics to drive this TAD made me to ask: what electronics Silbatone uses? It never was part of attention of anybody and regardless if Silbatone demonstrate god or bad sound it might be int...
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Not necessarily. Collect the large parts that you will be using (Power Transformers, Output Transformer, Plate Choke(s), Plate capacitors, etc.) put them all together on a table and try to visualize how you would like your amp to look like preserving...
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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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Few weeks ago, I had the chance to visit KOtriode and listen to his system but more specifically his Preamp. The preamp use half of the 6C33C per channel (one 6C33C has two triodes). It has two outputs, one is transformer coupled output, the other is...
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I have huge AMCC800A cores for two such transformersand good winders with HV experience. I also have a lot ofquiality coax cable, good to few kV for the chassis hook-up.Again, if somebody is willing to take care of that, I can lend.I'm myself 3000km ...
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I've made an itellectuall excercise and tried to see hoe to fullfil (some of) Romy'spoints regarding the bass amp.1) To get 100+ W from 833, HT between 2.5kV and 3kV will not work.Spending some time over the curves, 1400V, 0V, 280mA loaded with6.5k s...
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[quote user="joaco"] I think the amp is "immune" because of the nice circuit design ; condensator , choke and rectification (filtering) . [/quote]I think it is a mistaken view. There is nothing that be made in PS by chokes, rectification and filterin...
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Yesterday my machinist informed me that the End of Life Phonostage’s chassis will be reedy next week. So, I desisted update the power supplies of the thing replacing the FRED diodes with those no reverse/forward recovery Silicon Carbide Schottky diod...
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Ham-set,I think you are digging a hole in a wrong place. Regardless of any SiC alleged or actual problems I absolutely assure that the ham you have has absolutely nothing to do with type of the diodes you use but only come from grounding, shielding a...
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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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[quote user="Romy the Cat"]I bought the Lundahl chokes for L1 and was not able to us them and they were insultingly sharp. For the L1 you would need more henries and more DCR, the higher DCR will sound better and the “bad” and “cheap” Hammond chokes ...
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I think you'll have trouble adding a copper sleeve to the power tube. The thermal coefficient of expansion for copper is probably much greater than that of the glass used. Hence, the copper will enlarge much faster and break the glass.&nb...
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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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The idea of making a copy of an s2 driver also intrest me, but i have some other ideas than just copying this driver.I have been thinking to make this driver with an field coil magnet a 12 volts (using a car or camping battery) and a 250 volts versio...
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Roman,Well, what can I say.Different parts sound different, like it or not.I agree the topology needs to be "right" first, but once past that you will be surprised just how much difference parts happen to make.However, cogitating about your current A...
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[quote user="Romy the Cat"] There is no aspects of minimization
of the inductor size. You can go to 30K, or 50K, or 100K input LPAD. The LPAD (which
is not inductive switched attenuators with good resistors) anyhow sites behind
the filter, so the ...
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Many years gone now, I have tried to keep in mind the sound of live acoustic instruments and voices as I tuned my hi-fi system, as it and I have evolved. So far it seems that there are an infinite number of ways to "move closer" to a constantly...
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