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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I am looking into building a 45 tube SET amp and I keep reading about how important a good output transformer is. I read that cheaper output transformers like Hammond can be okay for mids and highs, but it will also reduce bass performance. If on...
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I did not play a lot with those DHT tubes but if there is any debate between contemporary production and 50 years old production than I would vote for older production. It is unquestionably that today the “construction” is way better and some of olde...
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I actually took the remaining dozen of gold grided 6C33C from that eBay guy. It is hard to say what those tubes might be and it is most likely absolutely not necessary in my case. Still, I figured that to get a dozen of 6C33C for a price of a pair o...
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Hi Romy ,well I appreciate the reply anyway! I have been reading your many threads and yes some on the Lowther designs but as you know your writings are a large large volume also and I havent made my way thru them all yet. As far as my room I could b...
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Romy, I realize that you have a good deal more acoustic drive available than I do, but here is my experience, FWIW: I lived in a larger version of a very similar configuration for 13 years. My listening room was in "the same" spot as you pictur...
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Thanks The CatI'm posting the pics of the build as I progress so people can see and pass on ideas, that's all. Are you suggesting you don't want horn projects shown on your site? I had earlier outlined the design, including cross-over points etc.I as...
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I have tried both SS and tubed PP with HF ribbons, but not until ML2s have I gotten the "calm HF" I wanted from the ribbons. I am still experimenting with the Audaphons, but they seem to do best from 4 Ohm tap. My little 2A3 SETs did...
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[quote user="Romy the Cat"]BTW, I have a local Bostonian guy have replied brought today a very interesting DHT amp. He has a number of DHTs and this one he reports is the special one, quite expensive as well. Although the electricity was not good tod...
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Ok, I connected the DH DSET channel into the main Melquiades amp driving the DHT from a separate transformer. Until the final transformers arrive I will be able to test and to measure DH circuit, perhaps finding better operation. I connected to the D...
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Romy, As you're planning to run a 6K load, you can run less current without the transfer curve suffering as much. So, another shot at some numbers.... rather than use a RC setup to drop the voltage, Hammond (not my favorite) make an open f...
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A typical switching supply does not evenly load the input (sinewave) power source and can create some dirt on the AC line (Paul's "backwash" statement??). Depending on many variables, the amount of contamination the switching supply could contribute...
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Well, I thought there was a lot of this going on all along, but that we just haven't come up with much that is "universal" in the usual, "what do you recommend?" sense yet? Maybe this is because one person's Cu PIO is another person's...
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I am NOT going to buy a new set of KR 2A3's just to compare to my "vintage" ones, especially considering the price has gone up to $800 a pair!
However, a NOS pair of Sylvania "spring top" 2A3 tubes is on the way to me. So I will have some things ...
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Sorry Robert, Your opening line on "Good luck getting midrange from F120A for non annoying monitors." tended to set the mood for the rest of your post in a negative light for Fostex drivers, the F120A included (at least for me it did)...
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Possible, I never was a big fun of 6E5P without Milq type of bias. I remember what when I did the simple fixed bias when a few year back I was trying to make Milq to sound “contestable” with ML2 it was racy and jumpy sound but nothing special. I feel...
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I totally am a believer that the construction of a tube determines how it will sound. This makes perfect sense when you consider the tube is relies on the changing flux of electrons in a vacuum. It is easier at least for me to visualize this as a ph...
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That sucks. I use to have a box of perhaps a dozen of YO186 but I did not see it for a while, pretty much from the time I moved to new house. I was listening today some of my “critical” reference stuff and concluded with very high certainty that my M...
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[quote user="Romy the Cat"]Why do you think I bout a 1000 of them and closed to the rest of my life my interest in driver tubes?Still, the 6E5P should not be measured as a driver but heard as a driver – the beauty in this tube is in its sound.I do no...
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KOT, as you may know, the ML2 has a BIG transformer to make "36 Watts" at clipping; but even with this and the trick feedback it is not the first choice for large dynamic/OB drivers. Of course I mention this because of your remarks about the 6C33C, ...
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I kind of less care about Lamm or about his new amps but rather I am interested using the example of ML3 to see what the DHT tubes are capable off. There are some people who worship direct-heated tubes and attribute to them some ventures (like ...
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then the idea of amp bypassing is relevant to the "clean signal" discussion. But regardless of the measured voltage out vs. driver sensitivity I suspect that there is too little of something in the way of drive and control between a&n...
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I would like to note that my disagreement with David about his and other justification of TT high price does not imply that some of high price TT are very good performers, and it is highly possible that the new Micro AF1 is a very good sounding TT, i...
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Yes , romy I understand completely about how you feel with dc i feel the same way when thinking on all my system , to put dc on an amp , directly can be great but not practical , will requiere lot of space , a big battery bank etc etc , so not practi...
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Novygera:If you have a transformer where the impedance primary-to-secondary is 5K:8, it means the turns ratio is (5000/8)½ = 625½ = 25. This is the ratio by which the voltage is stepped down and the current stepped up in going from the tube to the s...
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Nice, primer, Romy. Thanks.I had a pair of Wright WPA3.5s until last year. They are a very simple DHT (2A3) SET and that easily slips into A2. Although they use some sort of cathode follower-type loop of the 6SN7 driver's "pairs" to...
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[quote user="Paul S"]I have begun to see a pattern of diminishing net returns with respect to the smaller SETs, to the point where I wonder if their "potential" can ever be practically realized as Music in Full Glory. Lastly, the choice of an ou...
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Romy, I did some models using a 400V supply and a 6K OPT load. It's easy to get 4 watts output in this configuration, but using a 2K cathode resistor results in higher distortion and a weak transfer curve. Plate dissipation is around 11 wa...
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[quote user="floobydust"]I do agree that the internal structure makes a big difference... but, if the tube specs properly and has adequate immunity to mechanical induced interference, then you should not be able to discern any major difference in sou...
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Actually my leading though how to put one ass on all impedance chars is to have 5K primary with 12-16 coils of secondary. The 4K would be fine load for 2A3 type of pates. It would not be difficult to remap the secondaryes to get 7K-8K that would be O...
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[quote user="floobydust"] The main component that limits low-frequency response in any SET is the OPT. For these initial designs, I used the smallest Hashimoto SE OPTs... their H-203S for the 2A3 and their H-507S for the 45 which are rated at 7...
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