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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Yes, it is a bit confusing, as I meant to say that it will be a half of capacitance, I said it twice and it looks unclear. Still anybody understands how series capacitance works. BTW, it was a standard practice in before 70, before industry made by-p...
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KOTriode, I got a feeling that your unfortunate experience with the few presumably bad tubes that and your former experience with DHT tubes made you to treat the 6C33C as it is some kind of fragile princess. Filament burned for more than 20 hrs befor...
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Reading you guys I can hardly imagine how you can use this amp at all going trough the hassle with the tubes and bias.This amp needs to be monitored and pampered constantly and getting tha thing to work seems to be ceremony on it's own . How do...
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"Indeed for classical work I often find a slightly under damped bass response to be emotionally evocative and of benefit to the illusion of the acoustic"Have you looked at the primary cause of this issue with most SET amps? I can tell you that ...
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As I've mentioned elsewhere before, over the years I've gotten about 25% clinkers, among all tubes, from all sources, including "specially selected, graded and matched" tubes. Also, I have lived with the 6C33C enough to say it "drifts" in use, and i...
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Well 10k PS and 700V out ought to do it for headphones, all right (!), and the chokes ought to crank enough EMF to stand your hair on end at ten paces.Not sure why you need to fight DC, but...I already told of my own preference for bias adjustment op...
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I like having a center-tapped filament winding for flexibility. First, you can use a traditional approach on hum balance (what you have now) or use a slightly different approach. I use the center-tap as a fixed DC balance (cathode bias resistor solo...
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Vp = 240v, Vg = -90v, Ip = 165 ma, RL=1k5, 10W, H2 = 6.9%, H3=1%, H4=0.2% I used it with cathode bias (used 50w resitor, backed by 10x200uF capacitor). How it sounded - warm and punchy. I had an amp with F-3 about ...
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He did note that the ML2.2 uses a different OPT, and also that it uses "less feedback" than the ML2.1 (which AD owned for several years). I wonder what this means, "less feedback"? Why would Lamm mess with that very effective scheme? Does he just ...
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[quote user="N-set"] Sorry Romy, I did not want to sound nitpicking. I'm rather trying to understand if my copy works +/- properly.[/quote] I do not see you nitpicking, you do the right things and I wools do the very same if I was at your place. 1V...
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The annoying thing is that a big, odd-shaped, high-ceilinged room with openings might take a LOT of power before the room gets sufficiently charged in the orchestra's "power band". Just looking at the room, this might take 600 Wpc as soon as 60 Wpc,...
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N-set, I am not the one to double check your mathematical solutions, that's for sure. I wonder if in practice the curve values here are effectively tied to variables? I like the Chimera idea, but it has no "locked curves" to contend with, and it us...
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N-set, have another look at the Chimera "bias", and the sophistocated way the diodes effectively buffer the gain stages, also the way the caps are staged over the tiered ground planes. Also check where the Ls are with respect to the signal. Perhaps...
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Wojtek, in reality all “problems” that you picked from Paul’s comments are purely inventions of his mind. ML2 is truly “turn and forget” type of amp and it requires no dancing or prying around it. The 6C33C requires some attention when it is new but ...
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How can we compare anything if we know from the very first note what media is being used? The noise floor and sonic artifacts are unique to each media, so are we talking about confirmation bias? Let us assume that we have a first generation analog ma...
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The second stage switched to fixed bias
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This post is a derivation from the following post:
http://www.romythecat.com/Forums/ShowPost.aspx?postID=11797#11797
What is interesting is that I have a few the same types of shields for small 7 pin gas tubes and I have tried tho...
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Man would I love to visit the MIT fleamarket... only a few thou miles away alas.Well, I'm not advocating A2 in any way. The 13E1 will happily run at lower anode voltages but you won't get enough A1 power out, which is a shame cos you'll need a new po...
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Ok, the Milq MF DSET is well laid out. I have ordered a few parts and it will be on it’s way. I’m still contemplating what kind 400V cap to put right before the DHT tube in B+. I have space and I might go do film cap but I am not sure. Still ...
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[quote user="jessie.dazzle"]Since renewing all tubes in both ML2s, over the period of about 3-5 minutes, the V2 bias on one of the amps cylcles between .27 and .33VDC. Is this behavior indicitive of a defective 6C33C?[/quote] That is not good. Try to...
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[quote user="clarkjohnsen"] A person who has good sounding power lines? Never met one such! I can't help but think, however, that turntables should employ batteries.[/quote] The PP2000 dose convert power lines into good sounding power lines, so what?...
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Building the Melquiades: #3
Spent last might 3 more hours to pile up in one of the Melq the rest of the parts. It looks like now all detachable parts are there. Whatever parts have no assess anymore are wired and the main ground is in place. Pretty ...
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Hello,Here's an idea - uses a resistor in series with a current source on the negative supply to drop the voltage to the 6c33. Not sure how happy (sonically) the 6C33 will be with a 50k resistor on its grid. It would be huge problem at HF a...
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Pretty clean, Romy (and one hellova tranny at Fundamentals)!Of course, I have questions:I thought you said Vishay metal foils in your earlier response about bias adjustment?If so does that mean steps, or... how, exactly?When you specify "Full" ...
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Romy, I am not clear why you would worry about DC if you can set the RC where you want it and mute input.Biggest problem, of course, is HF, since it takes bugger all to blow those ribbons. But I thought you had that variac that the Serb gave yo...
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[quote user="cb"] Also i stick a 30k resistor in R3 and the results are very good. [/quote]R3 is Milq’s loading resistor and it hardly to do anything with amp itself. Milq has own input loading is floating on the bias chains and it has a ...
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Thank you JD for all the information. It was most helpfull. I will get the amps in the original crates, the instructions manual anf a few sets replacement tubes. Do you know the physical size of the fuses?. Seems like I have to buy some. I have alrea...
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KOT, I do not know the sound or character of that driver, at all, but I do think of the 6C33C as "vodka", since it is "tasteless", but it has some "kick". So, what have you mixed to flavor your vodka, and why did you settle on that driver?As for goo...
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I Forgot they did this. I only have experience with se driver stage. You would remove r3 and c1. change r2 to 10k and put the bias voltage from the gas tubes across it. I would try just regualar zaruthstra srpp circuit first. Like do you know it wi...
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To keep with Romy's spirit of sharing his work, I have attached a file of VER 1.0 of the DSET Power Supply. There are quite a few differences to Romy's published schematics but it is basically the same beast. You will notice a lot of power transfor...
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