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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Contemplating now how to organize biasing for 3 singe stages of my 6-chanls amp I was faced the dilemma: do I need to bias my tubes. The 6E5P/6E6P are Russian tubes and it means that are very different right from the boxes. The Milq, driver tubes, be...
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[quote user="Romy the Cat"] Hm, have another strange problem. Sometimes, and completely unpredictable, the amp goes crazy. As you might see I have fast blow fuse in anode line and seldom plate current rises to some crazy volume. In a past I ha...
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This subject does not bother me too aggressively as I recognize absolutely no sonic demands or listening temptations to change anything in my playback. However, there is a theoretical and conceptual curiosity on my part and I would like to learn what...
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I do not remember what I sent to you, since I sent you for measurement perpose then it might be the impulse version of the tube. In the image below are vertical tubes from left to right:
0A26E5P-E (smaller)6E6P-DR (larger)6E5P (the largest)0A2
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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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My DSET amplifiers are starting to go together (slowly).Bias string and bleeder relays/resistors...The remainder of the filter caps. The middle floor goes on and the filter cap for the First Stages (6E5P/6E6P).Then the OPT's go in place and the shel...
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Unfortunately I've reached out but not managed to make contact with John Hasquin regarding the spacer in the upperbass horn. I'll just have to wing it.I did finally manage to get a day and a half to make the second DSET operational but it refuses to...
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So, my two problems have been fixed, I think.First was the issue with the 6e6p for the HF Channel not being able to draw enough current. I checked the bias and it was fine and the potentiometer allowed plenty of adjustment so I changed nothing in t...
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Thanks Romy.I have secured a couple of pair of YO186 and some 1940's Sylvania 45's to play with. I wish the YO186 were easier to come by but I think that I now have enough for me to get a very good idea of the capabilities of the tube and circuit, a...
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So, looking at the schematic below......I have a few more questions25 turn pot in the filament supply. For the life of me I can't source a 25 turn pot. The 10 turn Bourns 3590 is the closest I can find. Do I need to keep looking for a more sensiti...
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[quote user="anthony"]I did finally manage to get a day and a half to make the second DSET operational but it refuses to bias correctly. I've traced the circuit a dozen times, checked component values, tried to find shorts, checked cap polaritie...
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Interesting. Almost unanimously the people at the forum and in private emails advice me do not inform/educate Amy about the audio. I do share the hesitance people expressed and I do appreciate the warnings. I kind of inclined do not do it, well; I d...
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[quote user="Romy the Cat"] There were some educational for myself observations made, in some way saying something about this specific DHT, in some way saying something about Melquiades’ single stage version and the Melquiades’ full-range two-stages ...
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I think it should be somewhere posted for my and perhaps for others future references. Here is the setting for testing Melquiades' single-stage tubes on Hickok 580/580A tube testers. To test the tube as a driver for a full Milq (two stages) set ...
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With all hugely exuberant welcoming and DSET and multi-way acoustic system approach I have to admit that it is a enormous pain in ass to maintain the system.
Two weeks ago I begin detect that my left channel somewhere in upper MF began to throw some...
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[quote user="anthony"] 25 turn
pot in the filament supply. For the life of me I can't source a 25 turn
pot. The 10 turn Bourns 3590 is the closest I can find. Do I need
to keep looking for a more sensitive pot or do you think 10 turn is managea...
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[quote user="Romy the Cat"] anthony wrote: The fuse. You show a
fuse on this schematic (that traces back to the B+ supply) but omit it on the 6-Channel
schematic that I linked to earlier in the thread. Do you use this fuse or
have you removed i...
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[quote
user="anthony"]First was the issue with the 6e6p for the HF
Channel not being able to draw enough current. I checked the bias and it
was fine and the potentiometer allowed plenty of adjustment so I changed
nothing in the circuit. A new ...
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Whoever implemented and experimented with my slicing of lower MF range by 3 channels (Upperbass, Fundamentals, and MF) know how powerful it might be. Changing loading and volume of each of the channels it is possible to write any sound one might ...
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David, there are no different Melquides versions. Melquides is all about to use two-stage solution around cathode-ground 5E6P/6E6P with grid resistor bias where the bias voltage buffered by gas tubes. You can creates countless versions around th...
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Well, spent a few more hours to listening Avicenna. Although it has much better sound then from the wall but there are a lot of moments in this sound that I do not like. It is kind of freakish and demoralizing as Avicenna feeds system with absolutely...
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I was contemplating the 6 Channel Super Melquiades conversion – it will quite a revision – and I am slowly inclining to make it not 6 Channel but 7 channels…Anyhow, the post will not be about the needs of extra 7th channel but rather about one of the...
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My project to add 3 one-stages channels to Super Melquiades look like progressing (it means I will have the new 15,5:1output transformers very soon) and in context of upcoming changes and, after long consideration and some tests, I desire...
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I have been contemplating for a week if I need to drain the power caps in my new revision of my power amp. The benefits to live the voltage in there is the cap continue formatting what the amp of off and it minimize the need to break-in or to train t...
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[quote user="serenechaos"]How does it suck? It does not generate second and fourth harmonics? It did change something else in a negative way? There was an unexpected negative effect on Sound, which you don't think can be "fixed?" Sometimes it's good ...
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[quote user="Romy the Cat"]It is obvious that 6SN7-2A3 and 6E6P direct have very different character. The 2A3 it feels like heavy-sunk time of tube and it constantly run a fully submerged. It has seriousness but it does not look at this point that i...
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I do not know if Russians still make them. I do not think they do as they hardly manufacture anything nowadays. I presume that there a large stock of them in Russia as Victor Khomenko (from BAT) told that during the peak of the 6C33C production Russi...
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Yep, it looks, like very close to “it” design-wise. http://www.studiomaudio.info/loftinwhite.htmlIn the way this amp is one of the manifestations of Loftin-White DC-coupled but it has some own things. The driver stage is the Melquiades Tube to k...
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It is nice to see the de-centresation of audio manufacturing. Formerly US, UK, Germany, France, a few Scandinavians and off the wall Japanese were making high-end audio. Today the lead positions in interesting high-end audio have moved to Poland...
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[quote user="Paul S"] Which caps exactly did you decide to try? I don't recognize the big black jobbies. Are they oilers? Are they 200V? [/quote]
I did not “decide” but went with what I had in my hands. They are the Ansars from the...
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