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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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Dear Romy,It may be worthwhile to check what transformer is installed in your DA924 because Lavry did change over to torroid transformers from the laminated core power supply transformer. Also it is a good practice to periodically ship the...
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The major question in the circuit above would be what the minimum values of the last capacitors (currently they are market as 1000uF) would be necessary in order the LC chain “do not see” the loaded output transformer and the plate of the tube. The p...
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Romy, would you say that placette is especially sensitive to electricity to function at it's best(sensitive in relation to other equipment I mean)? My unit is 110v and I am in 220v world, so I am using a step-down transformer on the unit. I have had...
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Dear Romy, regarding your efforts to solve variations in mains power supply, there has been an interesting thread on RAT related to the use of toroids as power transformers that morphed into a discussion about the level of DC offset in mains power su...
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[quote user="Cosmos"]Indeed it took me a very long time to decide upon regulate or not. I ended up with regulation option to save some chassis space and weight, otherwise I would need at least 10 kilos more and 30% bigger space that would make the wh...
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Ah, you use those gorgeous VPI boxes to host transformers. No wonder it does not sound well, what did you see the anything from VPI sound well? Seriously, I do have those VPI boxes, I do not remember where they come from to me but they are too go...
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[quote user="RonyWeissman"] I have the 515-Gs If I remember correctly, and I am trying to find suggestions on what is proper horn-loaded cabinet still. And I agree my tannoy golds so far have worked best with early 70's mcintosh 22...
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[quote user="morricab"] You are also right that to get everything you want from an output transformer requires a VERY expensive construction and top materials. However; even an expensive transformer is no guarantee of success. [/quote]
Sorry t...
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[quote user="drdna"][quote user="Romy the Cat"]David got rid of transformer and replaced it with a DC transformer, claiming that it is “better”.[/quote] And I should point out that not only is there still a transformer in the circuit, but many other ...
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All switch mode power supplies that receive a CE, UL or CSA approval have complete isolation from the wall voltage, across the dielectric barriers of a transformer, from primaryto secondary.The isolation of noise occurs because the incoming wall ...
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[quote user="Romy the Cat"]From what you describe I conclude that you have ground loops regardless of the PPs and the PP juts highlights the problem.[/quote]This may well be the case. I can't even remember the exact components I was using last year (...
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Hi Jorge.Firstly, be very careful if you're thinking about feeding a PP with a balanced AC input. It may be different with the North American PP units, but my UK unit did not like being fed by a balanced AC input. My balanced transformers already ten...
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[quote user="Romy the Cat"]Instead of simply fixing the PP2000 you decided to try isolation transformer way.[/quote] With all due respect Romy, you of all people know that applying the term "simply fixing" to the PP2000 is ridiculous. I don't have th...
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[quote user="N-set"] Romy would you care to elaborate on that a bit? In particular have you hear amorphous/silver combination?[/quote] Nope I never had it and even f I did it would be difficult to generalize anything. I had only once a fully silver...
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If you try/find an acceptable active MC step-up, please share your experience. I think the (stupid) Boulder op amp is the only one I've heard so far that does not sound severely "compressed" to me, and it really pisses me off that I have n...
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Romy, my experience with the Lundahl amorphous core transformenrs is limited to my new phono stage, and I have have been dealing other issues enough that I am not ready to write much about it yet.Still, there are qualities worth noting...
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Jim, the “full power undistorted bandwidth” is the only bandwidth that counts, at least as I understand bandwidth. The 25Hz to 19kHz is it what would expect from a regular SET if do not spend a LOT of money for output transformer. Your amp is not SE ...
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I do not know Bud. I report only what I see and I believe in what I experience. Almond all SETs that I personally have heard the Lamm ML2.0 had the widest subjective frequency range. I did measured how ML2.0 clip and it was at 18Hz at the bottom and...
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[quote user="Domidaw"] I also checked the voltage of the TR2 transformer and although the marking says 440v, it really has 508v!?!?
[/quote]Domidaw, when you read 508V for TR2, was the transformer in the circuit with a load applied or was it out of ...
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[quote user="Paul S"]…. they want to be sure previous clients feel perhaps like the times and technology are passing by them by rather than making them feel like they were sold a bill of goods.[/quote] Actually a good point. It presented as “technolo...
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[quote user="Romy the Cat"]I do not know, Model Two was not supplied with 'ground loop isolators', so I am not sure what you are talking about.[/quote]These are described in detail on page 8 of the User's Manual.[quote user="Romy the Cat"]I have two ...
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[quote user="gurevise"]Ideally, you'd want to drive 35 feet of balanced interconnect with the low impedance source ( say below 150 ohms or so). How low depends upon interconnect capacitance. You can try Jensen output transformer to convert SE to Bala...
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The 6sn7 is a fine amplification tube for use in preamps or gain stages, but it has way too high of an output impedance for driving power tubes. This is my personal preference. It also depends greatly on the topology. Maybe George u...
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[quote user="Paul S"]I don't know what you mean by "the demagnetizing coils in its output transformer". What does this mean?[/quote]I do not have any plans about ML2. A friend of my asked me to help him with his ML2. So, I did end up the amps s...
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[quote user="Merlin"]My SET doesn't have an output transformer. Just four tubes direct coupled. Bandwidth at full power is 2hz to 35khz.[/quote] Well, your SET might be able to bypass fundamentals from 2hz to 35khz but unfortunately it is all the OTL...
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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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I continue to be amazed at the varied views relating to BAD power at certain times of the day.I broke with that 10 or more years ago in moving to amplifiers, line amps and DACs configured with switched mode supplies.I not only keep my DAC permanently...
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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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[quote user="Romy the Cat"] For above 550hz you might use the same LL1627A if you wish, for MF the 200-250mA gap will be fine. Yes it would be reasonable to desire less inductance in the transformer, mean less turns but honestly I personally did not ...
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