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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Driving an 801 or 10Y with another DHT would be tricky. The driver stage would need a Zout of <400 ohms. A 2A3 might do it via a step down interstage although making a good interstage that'll handle 60mA will be difficult. A 45 at near maximum rat...
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[quote user="Romy the Cat"]I was not wild with original San Audio Kit sound, I did not like when I redid is with better parts and I frankly not a hugely enthusiastic about the sounds of San Audio Kit with 6E5P driver.[/quote]After thinking about this...
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[quote user="drdna"] It has the Magnequest DS-025 OPT, connected to the 16 ohm tap. [/quote]
So, it is 2.5K primary and you drive 8R speaker with 16R tap. That makes the 2A3 loaded in your case with 1750R. I think it is necessary to know in order to...
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[quote user="Romy the Cat"]It is unquestionably an ambiguous project. The topmost question that I would ask myself after this project would be the following: can Milq-biased 6E5P to be as good (sound-wise) DC driver as some vintage direct heated tube...
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[quote user="perrew"]Anyone know if Tribute still in business, and if not can recommend company that has double coil on single c core for 2A3?[/quote] Tribute is a single guy who makes transformers. Get in touch with him and he will be “in business...
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The room shape depicted should be relatively easy to load, given that it is in fact rather large, volumetrically, so power to scale must be pre-supposed.As it happens, my own listening room was a lot like this for 13 years. 2A3 SETs with 97 dB BassZ...
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Ok, once I got pin 8 connected to pin 1, the curves came out straight. Here is the true pentode plot at 200V screen, 0.5V/step:[img]http://www.hagtech.com/blog/images/7788-04.jpg[/img]And here is my new data sheet plot for triode mode:[img]http...
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Yeah, so the closeness of the grids results in a higher current gain. So what? What is the relationship between gain and sonics? Are you saying that all high gm tubes sound better than low gm tubes? And does that include 300B ...
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Ok, so it took me awhile. I finally got around to doing a design around this tube, believe it or not, as a driver for a 2A3. It just seemed right. Bought some 60's vintage(?) Amperex "PQ" on eBay. Well, here's what it looks li...
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Jim, It is the super tube – you forgot to mention the amount of noise with its transconductance…. You use the 7788 as a driver to drive 2A3? This is kind of strange: the 7788 has relatively low bias and a typical line voltage should sent 7788 deep in...
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[quote user="drdna"]
Paul S wrote:
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" Yes, my thought is that there is NOTHING universal, but that thes...
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Ok, I did play today with the MiniMe. I have to tell that then it turn black I kind got soften with it does not look to me as large and violent as I initially thought. I made some measurement and some listening. I peaty much know what I want to be an...
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Well, I do not know what DHT filament scenario I will choose. I consulted with different sources
http://www.intactaudio.com/forum/viewtopic.php?t=823
…but I still have no definitive opinion. There are few logical cons and pros for...
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[quote user="floobydust"] 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 fa...
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I closed up the amps and moved it to the default operation position, right along with it all Dominus cables and so on. I played just mono music and was very interesting where I will find myself with this amp Sound. The right channel still was s...
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[quote user="floobydust"] One of the reasons I no longer use a tube tester. They make a measurement at a specific target operating point(s). You don't really know what it is, so what are the chances they will be close to your actual circuit opera...
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[quote user="be"]Hey. I have not seen it mentionned here, have you tried, or even considered regulated dc-current supplies for the heaters?Should have the sound quality of ac-voltage supplies combined with the lack of noise of the dc-voltage supp...
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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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One of the reasons I no longer use a tube tester. They make a measurement at a specific target operating point(s). You don't really know what it is, so what are the chances they will be close to your actual circuit operating point? So choosing a clo...
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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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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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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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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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KM:
It will be a little project to modify the amplifier, but it may be educational. To optimize the Moondog circuit for the NOS 2A3 tubes, so they will give their best, I plan to buy a new OPT with primary impedance around 3.5-4K. Will that be s...
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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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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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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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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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[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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