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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 Costa"]Romy do you know anything about their preamp. This unit looks massive. Very little info available on it. The one description I found sounds like some of the typical American over done foolishness.[/quote] Back in 90s there wa...
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[quote user="Antonio J."]Thanks for the comments. I believe that a preamp giving the same kind of benefits of Melquiades and being able to deliver them with any power amp and speakers would be something truly great. I know it won't be the same than t...
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if there is only one output on the source, it should feed the main speaker preamp or Dac. The preamp or dac digital or analog output would the feed the pre-pro or receiver with auro 3d capability which would then feed the ambiance channels.If the sou...
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In the past there was such a concept of full-function preamplifiers that included MM and MC inputs. With time such devises die out and nowadays it is VERY difficult to find a full-function preamplifier generally and a good sounding full-function ...
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The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does has a remote control. It i...
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[quote user="Romy the Cat"]From what you describe I can conclude that your DAC is not good. You said you use DIY wireless DAC with tube output. I do not know what wireless mean in this context, but it is not important. I also know do not like any tub...
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Hi Romy,
I just want to add my experience I had last year with a transformer based (actually it was an autoformer based) "passive" preamp. I thought that this could be the final solution in my preamp quest. Alas, it was not the case.&nbs...
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Have put all my DHT's on the curve tracer to see if pairs can be matched for preamp duties. My stash of 10y/VT25/801a/VT62 are generally all very new or NOS specs with mu and plate resistance varying a little, but generally close to nominal specific...
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It always amasses me how the audio media pull out of it’s ass a “literature” about preamps. They write review after review, admiring the sexy knobs, amusing futures and the reported “musicality” but ironically a year after year NONE of the audio prop...
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“Do you hear the people singLost in the valley of the night?It is the music of a peopleWho are climbing to the light.”Les Miserables
PREFACE
I would like do not shape this article as a review: I do not write “reviews” religiously and I have many re...
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Hello, would it be possible for us to see the diagrams and schematics behind the Zarathustra II in the same spirit as the Melquiades was conceived, noting that the best of ideas are formed with the purest of sentiments?[quote]It is Dima’s and my stro...
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[quote user="Romy the Cat"]
I do not know why Placette
does not work in your situation. You do not have enough volume? If it is the
case then you might have too low gains in your front end. All my front ends
have very high gain: Bidat, Lavry, my...
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Ethan,
Since I published the article “Preamplifiers: keys to mystery” I received many emails from my site visitors asking about Lamm prams and questioning my remarks in comparing what I said to “data form other sources”. Some people disagreed or sur...
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I got toady the preamp from Guy Hammel. Oh, boy, I did not expect that it will be so interesting.
The initial idea was very moderate to add more inputs to my preamp. We ended up with adding 5 inputs extra input, so I have 11 all together – eventuall...
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[quote user="jessie.dazzle"]I should mention that with all the wonderful things it does, the L2 (preamp) definitely deserves a fresh pair of 12AX3s and a 6C19P. (I have not changed them since starting work on the horns... all tubes are exactly one ye...
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Just a brief note on my recent addition: Placette Active preamp. Due to a recent purchase of Tannoy Golds, I had the opportunity to pull an old McIntosh SS amp out of the closet recently. This amp has gain controls, so I tried running it ...
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[quote user="Lbjefferies7"] Having said that, the 15 Commandments above look like a fine solution-based pre-amp...and the title reminds me of Mel Brooks as Moses. [/quote] Yes, it was exactly my point of reference. [quote user="Lbjefferies7"] A p...
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Well, probably not up in smoke, but it is just not functional any more. I was away for a few days and came back to my room to find the Placette refusing to change volume or select a source input, so something is amiss. Perhaps something has been am...
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Thanks, Jim, and thanks to everyone who replied in direct emails. Summarizing what was advised to me it looks like as now the input impedance of the amp is around 4.5K. That was roughly what I would like to have, though I would like to go even furthe...
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The transformer in this preamp was given from a friend who want to learn how to wind transformer. If I remember correctly it started out as UBT, they were bought (when UBT was operating in the Silicon Valley) at the company swap meet. They were rejec...
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[quote user="manisandher"] This is very interesting and something that I have not noticed. Because I cannot double the clock frequency going into the Weiss AFI1, I have tended to ignore playing/recording 4fs files. But, I've kept the second AES/E...
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In my post above I have mention that Srajan is in a way a brainless parrot that repeats the heard and has no ability of desire to understand what was the noise about. His comments that 6E5P and E810F are “close electrical” is a good indication how it...
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[quote user="Antonio J."] The builder regards VR1 more like an "offset to 0" adjuster than a bias control for the 6E5P since its working range is quite narrow. He asked me to know from you if along the 6E5P's lifespan it needs further adjustment...
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[quote user="Romy the Cat"] Still the key is to treat the cables, all cables that go into tuner and into the processors. Do not forget that you have a perfect loop: tuner goes to preamp, as in the same time tuner goes to A/D-DAW-D/A- preamp. So, you...
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*** … unless you are saying that the preamp Zout will possibly change the DSET filter phase somehow? Yep, this is exactly what I am saying. Look the impedance of your preamp is factored in the source impedance of your channel’s filter. The argument...
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Floyd,
Regardless your preamp uses output coupling cap you would still need a positive supply. Positive supply compensates the negative DC voltage at the amp’s input. Theoretically if you do not connect or disconnect the cable between your preamp an...
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Romy, have you had any experience with Autoformer VC's? From what I can tell they could work quite well at the output of a preamp driving the DSET's, mainly because they lower the output impedance of the preamp as they attenuate rather than staying ...
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Thanks for the extensive reply. I wish I knew exactly the use the preamp is doing of them and if they could be safely replaced by those alternatives you mention. I believe they're regulators within the power supply. The problem with them is not burni...
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KOTriode, I was not criticizing your DAC, whatever it is. I was saying that system-design-wise if your preamp was able to inflict such a dramatic change in Sound then in my view it just highlighted the problem with DAC. Take another DAC, or any comme...
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Marc Mickelson always was one of the heroes of audio propaganda – he always was able to load a maximum cargo of “strategic information” to the readers without being insulting to anyone and without too obvious demonstration of his real intentions. I r...
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