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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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The weak bass of low-power SET amps is well known. I don't think anyone would disagree.Some reasons:Simple low power, especially with 93db speakers (try with 106db like Yorkville LS1208 horn subwoofer it might be different).SE output transformers hav...
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Adrian, Fair enough... it's not about power or gain in your case, just making it sound as clean as possible. Well, if you go back to my earlier post on findings, I list the basic operating values. Just to recap them here:Plate supply ...
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[quote user="Paul S"]Seems like a good basic concept for a laconic PP amp, though...[/quote]
The fix bias of driver and out stages are fine. Why he need to have 1:8 input transformer. The driver stage does 32 time gain, the output stage does ...
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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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Stephano Two good ears has put a post on his site about his new 4 way passive xover.I think this is a better direction than the digital xo. The designer, Thomas, designed also the preamp and I guess he has taken into consideration the input and ...
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The new sites announce that Parasound introduced John Curl designed Halo JC 3 Phono Preamplifier. It is passive EQ, three-position input impedance switch, DC coupled amp stages with FET followers. It reportedly has average noise ratio and unknown gai...
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[quote user="Romy the Cat"][/quote]This is a technical post.I've made some progress on my assault on the above version of EAR 834. After hard (mostly because of my idiocy) labouring through the soldering, I've creeped to the level where I can make so...
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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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Legendary singer/songwriter/poet Leonard Cohen will be gracing stages throughout the U.S. and Canada with a new live show, beginning October 31st in Austin, TX. The North American leg of Cohen’s “Old Ideas World Tour 2012” follows on the heels of...
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Perrew,
LCR is not active at all; it is the very same passive EQ as your RC? I think you a bit confused with terminology. The main logical explanation (there are many of them) is that capacitive filtration is very bad one and need to be minimi...
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Please do not get the idea that I ever "ruled out" active pre-amps or came to the TAP through some sort of object worship. I really couldn't care less about how the job gets done. Active is fine, as long as the results are there...
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[quote user="Romy the Cat"] the passive linestages (resistors)tend to be more transparent then active stages but it is only in the case when a passive line stage (attenuator) sits right next to the grid of your input tube. As long as a passive linest...
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Hi Antonio, I just realized I glanced over that thread assuming its relationship to the 6 levels of benefits. Its quite interesting, but I do not know where I fall in that spectrum (no, it can't be discrete stages as its far to "big" to really ...
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[quote user="haralanov"]N-set, a friend of mine built an amp with this monstrous USSR tube. It has 3 stages and the GU81M is driven by 6C33C. Within context of driving mid or high sensitivity bass drivers, this is all you need. In comparison, his pre...
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I was wondering what is coming out from PP2000 that makes one unit affect another. It might be radio and magnetic stray fields. Last night I took my gauss meter and was sniffing all around my PurePower regenerators. I was not able to see any signific...
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Hello Gera,First thing I would do is get rid of the active Xover, in my experience they mud everything up. preamps are very important and this is like a double preamp with a lot of gain stages. For bass you can maybe use it. I use a separate Xover...
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John, the problem so far has been finding reliable, working examples of available solutions that actually get the job done for high-demands hi-fi, not to mention finding something like this that works for big amps and phono stages (or DACs) simultan...
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[quote user="floobydust"] Some very good points here... if I downloaded the correct schematic from your site for the 6-channel Melq amp (also has the term DSET in the title) then you have created a 6-channel SET amp with built-in crossover points. Yo...
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Hi Romy,I was very wary of even discussing this issue here. I should have followed my instincts! Mike is a rational & considered person. He will do what he does. People can choose to like it or not. It really makes no difference to me. I'm not in...
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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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Paul, 100% agreed on the real world test vs all other mental exercises!!!Not sure on what do you mean by the "follower"?Yes, I need only 2 stages, perhaps TVC at the input. I'll even have a bit too much gain, if I'm correct.Romy style bias on 6E5P an...
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[quote user="deemon"]Do you mean a battery bias , Brian ? We didn't try it because of 1 V bias voltage - I don't know if the battery with this voltage does exist . I know only 1,5 V and 1,2 V cells ...... maybe using some chemical reactions we can ob...
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Hi Josh,I think it is all a matter of perspective. Personally, I would be very surprised if the key elements of the sound of that system that so impressed you is due to the Goto drivers. There are at least three more important things: that big roo...
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Adrian, I wonder how you wound up with the never-mentioned FET 10? FWIW, it was one of the better all around phono stages I've heard, and - not that it matters - I prefer it to the EAR 834 I heard. Is this another case wher...
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Hi Alex,I am sorry, what you claim can not be. No cap is going to separate bass instruments better.The brilliance of the 834p circuit is that the EQ also uses the miller capacitance of the tubes in a very brilliant way. The power supply caps are very...
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I chose the 170V point as midway between the 250V supply I had for the CCS plate load. The choice was for maximal signal swing in both directions. [quote]in a properly designed amplifier a transformer should clip before the active stages[...
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[quote user="jessie.dazzle"]....but are going to be something like 10 feet in length .... I will try to document the process, and consider posting the more interesting stages here on the Cat's site. [/quote]Well, Jessie. It sounds defiantly as a...
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It's hard to predict how the anomaly will sound. Sort of like a dynamic bias shift in the tube. That's why I think IMD. The shift moves around at LF rates, so the HF reproduction can fall on any number of load lines (within loop are...
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[quote user="Paul S"]Anthony, congrats on your amazing progress! I know how hard it is to carve out time for this stuff! I see you are looking for gain from your pre-amp, which makes me wonder if you have been using the passive Placette, as opposed t...
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Hi Romy,Minor question with hopefully a simple answer.In the DSET schematic you have a 12.1k resistor in the bias for channels B, C, D and F. I have some nice 12k resistors here (not 12.1k) that I could use in those positions...can you see a problem...
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