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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Here is a snippet from an email from Jonathan Carr (Lyra cartridge designer) about objectives and considerations regarding cartridge loading. Most of this is old news, I only re-post it here as a convenient synopsis on this most misunderstood t...
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[quote user="Romy the Cat"]
Perrew,I do not know if you use sarcasm in there but Lamm LP2 is not my bellowed phonostage. In fact I am one of the very few people whop do not like it at all. How much in what I do not like in Lamm LP2’s MM section com...
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[quote user="nl"] Gordon Rankin of Wavelength Audio did a series of one-stage DHTs with a step-up transformer input about ten years ago. I think they were called the Mercury series. By all accounts, they sounded good, but of course had limited gain, ...
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Paul, I'm not rushing to the breadboard. I'm trying to visualize if Romy's constraintscan be satisfied. I have to gather more data on GU81 to think of doing anything.How linear it is?? Perhaps this tube is an audio no-go as you've mentioned?Going to ...
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I just finished the GM70SE amplifier. It is built on the same size chassis as the 6C33C (with few extra holes) but 1/2 in higher to accommodate quite a few extra parts.
The GM70SE is built with quite interesting feature similar to 6C33CSE :- Double...
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Below are some images that show the locations of the various filter caps within the amplifier chassis.The big cap for the First Stages is located directly below the 6E5P tubes...The big filter cap for the Bass Channel is adjacent to the Bass OPT (pee...
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For some time I have felt that most audiophile phono stages are over-built, especially those pretending to be thought-out, "no-compromise" designs. Ironically, it seems to me that few (or none) of the "thought-out" designs I have seen and/or heard a...
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... am intrigued with DSD DACs. And for three main reasons:1) If you look at the attached jpeg (taken from http://www.korg.com/services/products/mr/Future_Proof_Recording_Explaine...), DSD recording appears to have a simpler path than most modern PCM...
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Thanks, Keith and Montepilot.
I did have my 7788-7721 phonostage with LCR filter and I always liked it, pay attention - it was 68dB gains with just two stages and with NO step-up transformer. Allnic Phono is 3 stages with step-up transformer...
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I think there is a definate trend here regarding distortions that cannot be ignored. Guy, you pointed out some excessive 2nd order harmonics with the Melq bias point. Hey, maybe so. I haven't really looked into this tube - but I jus...
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Ok, I completely disassembled one of the Super Milqs and physically injected extra 3 channels. It looks like everything is all right real-estate wise, still I would prefer of course to have more space….
As now the amp is completely shattered ...
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[quote user="drdna"] So it would require a new OPT to be made with around 3.5-4K primary impedance. The power the amplifier puts out is already far too much. I always have the volume dial around 1-2, so this will be okay. I don't have such an OPT on ...
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After much listening and measuring I convinced myself that there is no way for me to escape the use of the 24dB per octave slope if I want to keep the sound of my midbass horn not violated. I also have to admit that I will not be able to render 4th ...
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A few days ago a friend of mine and I did spent over an hour to fantasize what might be done if the ULF tube SET is planned. It is not so simple as to drive the tube like 833/GU-48, you will not be able to do with Milq driver. But I also would like d...
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[quote user="Paul S"] Given speakers that can be driven dynamically by single stage amplification, there remain a host of issues, and among those issues is color. Most compression drivers are color-challenged to begin with…[/quote]
I would agr...
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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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Amir, I have shared that I quite liked the (original) Audiopax amps I have heard. Whatever they claim, they do sound right to me. Although I have never played much with a de Lima amp I have played quite a bit with most of my own phono stages, pre-amp...
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This is always good advice, to get to know the character of the phono stage. Because my favorite cartridges are not low voltage (I use Decca London Jubilee and Reference) I have never had a need for the ET SU-1 step up unit. In fact, I had this in my...
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Interning, I never heard about them. Might I ask you what triodes were used in this thing, how many stages and what “most advanced RIAA available” the unit use? I understand that it is passive EQ but what is so unique about it? Also, if it might act ...
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Paul,I agree 100%. Well sort of.....Can the idea of the overengineered, atomic reactor power supply with water cooling really offer someone just interested in great music a "better" solution?I think for many, the technical superiority is at least as ...
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Paul, if by error correction you mean frequency correction then I was thinking about +/- the same.i) Active filters; I have zero experience with crossing-over but people who seem to know what theyare talking about all agree that at ULF active is the ...
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[quote user="Romy the Cat"]
[/quote] Funny it took 2.5 hours to build the San Audio Kit for 6E5P. The 6E5P is at 150V (a bit low for it but it is OK), loaded with 15K and coupled with 2A3 via a cap. The 6E5P is biased with one 3.6V lithium ba...
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I was playing with new power supply over this weekend, trying to optimize everything. First I got rid of bleeders at all B+ - it has enough critical current with them according to my measurements after the bride. All supplies after the first ...
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I really do not what is gong on there and why. Thorsten's comment that line-level crossovers do not act like speakers’ level crossover confirms what I feel and what some other people suggested me. Yes, the reactance of the crossover component, the in...
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Perrew,
I do not know if you use sarcasm in there but Lamm LP2 is not my bellowed phonostage. In fact I am one of the very few people whop do not like it at all. How much in what I do not like in Lamm LP2’s MM section come from the WE417 tubes...
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Here is some kind of MM phonostage with around 45dB gain. Two stages direct coupled with input pentode and output capacitor.
http://myemia.com/Prod.html
http://hifiheroin.blogspot.com/2012/08/emia-phono-specifications.html...
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[quote user="drdna"]You want a suggestion for a good 2A3? Get Ricardo Kron's (KR Audio Enterprises) KR 2A3. Very rugged, overbuilt. There is no comparison between this tube and all other 2A3's, and I tried many of them. The sound is more dynamic, the...
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Thanks, floobydust.
There are a lot of interesting points in you post to consider. What speaker you drive with your 2A3? If they are relatively high sensitively (like compression drivers) then did you consider going with a single stage? I think I ha...
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Here is an article by Leonard Norwitz that I think some of you might find motivating. I do not know Mr. Norwitz but it sounds like dinked too mach Qvortrup’s coca-cola. Anyhow, although I do not agree with some (sometimes many) of the Mr. Norwitz’s c...
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***The proper loading value is difficult to say without knowing your system, as it is partly a preamp and ultrasonic RF issue as well as one that involves the cartridge and audible frequencies. Some cartridges have frequency abberations within ...
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