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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="N-set"]BTW, how stable 6E5P is? I'm asking as I was contemplating biasing the output by the voltage drop on 6E5P's plate choke (DCR is say around 1k),with only some minimal autobias on the output. The drawback is that any drift in th...
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[quote user="ml8"]...but resistor between screen grid and plate, to my hearing, makes sound slightly unnatural, especially in highs.But this may be not true in your case (i didn't try to use this resistor with 6E5P, only with other power tetrodes), s...
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Taras Oleynk aka “ML8” sent me a couple months ago his measurements of different driver line-level tubes including the Melquiades’s diver tubes – the 5E5P. I am posting his data here with his permission, including Taras’ statement that is JUST PRELIM...
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I still would hesitant to short the scene and anode and it would require a very sever control of the tubes. The problem is that it would be necessary to do not only then they new (it not too difficult to put then before a fast scope and to see if the...
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[quote user="be"]Thanks ml8, do you know how much it could swing before problems, either due to clipping or grid current?[/quote]
I would be interesting to know how much plate voltage (and power) 6E5P would have with no bias. If ml8 would promi...
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Why do we use DHT tubes? it is not because of their technical specifications. They have low transconductance, a problematic direct filament, and they cost a lot.Obviously, it is because of their sound. Some people like it and some people don't.The DH...
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[quote user="cv"]Here's a crazy thought... have you every tried driving the S2 directly from the Placette?! I know the 6E5p does some unique things but I wonder if it might be educational.The placette has a 7 ohm Zout right? Don't forget that that do...
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[quote user="N-set"] I do have some serious concerns with respect to my design, the LF stability beeing the most important one (before we even approach talking about the Sound...if any); you may rememebr I was asking you about the stability and relia...
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[quote user="Romy the Cat"]I do not know what you mean by “specific set-up” and what San Audio did is very orthodox use of 2A3 and I did not change it. The only change that I made (and I do not know at this point if it was a good change) was the chan...
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[quote user="Genn"]However - you decided to use 6E5Pi to drive 6C33C, and the filed of competition in this case might be higher - including those E810F, E180F, EL84.. or even 12AT7, or even (probably) WE 437. Some of them would need...
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If I say that it was horrible with San Audio 2A3 driven with buttery biased 6E5P then I really meant it. I got home today tune it on and it was so bad that decided that it shell not use it as is. Even though it an experimental amps but still it...
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[quote user="Romy the Cat"]
[/quote] Funny it took 2.5 hours to build the San Audio Kit for 6E5P. The 6E5P is at 150V (a bit low for it but it is OK), loaded with 15K and coupled with 2A3 via a cap. The 6E5P is biased with one 3.6V lithium ba...
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[quote user="drdna"]As I had been looking at all these tubes I began to also inspect their interior construction. This will amuse you: one thing I would do is to hold the tube right up to my ear so the glass would be touching and thus mostly damped. ...
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Jim, what is operational point of the 6E5P, what it drivers (how it coupled) and how do you bias the 5E5P? BTW, the clipping at the bottom is very good, very symmetrical. Try to measure which stage clips first: the driver or the output stage. One m...
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[quote user="Romy the Cat"]Celsius, I think you do not take in your equation the input voltage. If you bias 6E5P with 4.1V then it can pass 4V with no feedback. Since the tube has under normal circumstances 33 times gain then you have 132V RMS from ...
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I'm sorry, I thought I mentioned that I was responding to the earlier post about HF, up the thread. I guess I misunderstood from other reading that you much preferred your crossovers at line level, while I was proposing it a...
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...but resistor between screen grid and plate, to my hearing, makes sound slightly unnatural, especially in highs.But this may be not true in your case (i didn't try to use this resistor with 6E5P, only with other power tetrodes), so i think i'll sug...
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[quote user="ml8"]So sometimes i just wonder why do you need 6C33C at all, with your high-sensitive speakers.[/quote]Actually it would be VERY interesting to expend on it sometimes… Why the Supper Melquiades could not be juts one powerful 2-stafes LF...
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Post #2:
R23
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by
ml8
on
2007-03-23
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Romy,That's true that this resistor have negative impact on sound quality. You can run your 6E5P without it as long as you do not get parazitic oscillation.Just connect screen grid and plate electrodes right on tube socket, using shortest possible ca...
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[quote user="drdna"]Hi! I have got these 6E6P tubes from Georgia (in the former USSR, not the home of sweet potato pie). I have removed them all from their protective glass packaging, but I am unsure of how next to hook them up.[/quote]BT...
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Romy, I tried out a 6e5p as a driver tube in a PP 2a3 amp (was using a 7788 for driver). Well, knock my socks off! The amp went from 6 watts to 8 watts! Distortion dropped a tad, but mostly it was more signal swing. I could dr...
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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 not know why it gave to y...
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Yes, it is imposable to have + 0.4V on the grid, 0.0V at input, with R5 resistor in place and the gas tubes outputting +150V and -150V. My apologies, I meant to say I have minus 4.4v on the grid with the inputs shorted. Then I unshort the ...
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Jim, returning back to the subject of tube testing….
I do not know if you have seen my most recent obsession; the idea of driving my Macondo with 1.8W of a single 6E5P:
http://www.goodsoundclub.com/LatestPosts.aspx?ThreadID=4241
So, what I learned...
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N-set, yes, I did not have any single 6E5P or 6E6P filed on me since it was accepted to operation. About your circuit – you need to talk perhaps with Dima or with others about it. I am absolutely not familiar with PP amps, I do not even understand ho...
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Romy, may I ask you why you've employed an autobias on 6E5Pin Milq's MF rather than your biasing technique (if there is any reason at all)?Paul, I don't think I'm following you, but anyway I didnot want to analyze the Axiom,but rather learn about 6E5...
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Sometimes my time will come and some of you will try the 6E5P as a driver, properly used. Then, if this person has a sensitivity and rudimental audio intelligence to recognize some unique 6E5P’s sonic signatures then he will find interested to reread...
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A nice British guy:http://www.bartola.co.uk/valves/tag/6e5p/...
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Dear Romy,
I have been reading the threads on GoodSoundClub about your journey with development of the Melquiades and Super Melquiades amplifiers. They are very interesting to me. I am pleased that your purpose was to produce a particula...
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I have to admit that although the Macondo “Water Drop Tweeter” sounds very good but I do not have that “shocking sound” that I got from the “Water Drop” during my initial introduction to it. I kind of always felt it and I thought that I get use t...
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