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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="AnonymousUser"]I am thinking of launching into building or rather having buitl by a techie friend a pair of melquiades. Could you tell me more about the cost of building a pair of these amps? then how do they compare to other amps? I mea...
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Allo I tell you what it is that's putting everybody off, it's that bloody input stage biasing arrangement... The other thing is that people who know enough to build it have probably read a bunch of stuff here and there, and therefore been anointed in...
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[quote user="Paul S"]What is the "reverse engineering" version of an SET circuit that would accomplish - in terms of audible results - what you want? The reason I suggest 3 stages is only because I see a gap between required input and necessary outp...
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N-set, this might be a case where you can start with the 6E5P without working it so hard and still have enough gain , and correct as you go, because of the diminished frequency range requirements, and because of the third stage. Am I talking heresy ...
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I am sure I made a reply last night, but it is nowhere, so here it is again.44V across R22 is equivalent to 0.88A which is way too high and would require a resistor rated better than 40W. R2 is dropping more voltage than it should. I would look at ...
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Those both look fine, but all your voltages are hot...all of them. From afar it seems as though the primaries are not correct for the mains supply by about 15% eg. wound for 200V primary but you have 230V, or something like that. Where I am has nom...
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Yes, Daniel, this resistor is somewhere between 30R and 100R, the value is not truly important. The purpose of the resistor is to slightly decouple the potentials of plate to grid, it cares no current and you might use 1/8W resistor or even less. BTW...
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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 tubes. I did ask thin question ...
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Paul, I know NOTHING about pentodes. I looked at the curves:at 1500V/300mA/-85V loaded with 3.2k will give a whooping 190Wwith +/-85Vmax swing, staying in A1. At 2.4k this drops to 155W.G2 @500V, eating 50mA of current(!)But the linearity...???? The ...
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Well, as a prototype it might work but as the Milq sound
that I was implied the amp with no gas tubes in bias supply is not good in my
view. I never was satisfied the way how a regular 6E5P driver 6C33C. To me it
was very perfunctory and much unso...
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I kind of disagree with Adrian. The wire, the coupling caps, the cathode resistors and many other things are superbly important but it is after the strategic topology is settled. In my view caps, resistor, wire and other things are responsible for th...
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[quote user="cv"] I see why you want those tap options now - essentially you want to be able to load down the 6e5p but still use all the secondary sections. There may be some frequency response variations in the ultrasonic range by playing the tap ga...
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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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I have never used EL34 in triode, but I think it is not hard to find acceptable examples of this fast, reliable tube, and with conservative bias it should let your 6E5P "shine through", if that's what you want. Nothing like 811, 845, etc. in this re...
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Risking that the topic has already been discussed and that I postin a wrong category (Romy feel free to (re)move this post:Is there any sense in trying 6C33 at higher volatges and lower currents?More precisely, I've been wondering if 1/2 6C33 @ 300-...
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couldnt get "insert iamge from gallary" to work so i attached it. Had it working for a couple weeks. Single stage 6e5p testbed. The B+ rcore and output transformer is underneath. In the end r23 of 30k worked with 30h choke. no choke on gas tubes...
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Hi Cat,It seems the 6e5p is driving the transformer directly. I've used various versions of even simple mosfet followers to good effect at the headphone level, but never considered using a speaker level transformer. Did you and Dmitry cons...
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That's very interesting. Looking at the Melquiades i've always wondered about a few things. If you don't mind, i will ask you about them:1. If you think gas regulators make sound of 6E5P so nice, didn't you try putting gas regulator tube in the grid ...
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Since I know about a few ongoing attempts out there by different people to build Melquiades I would like to share with some of my observations regarding corrections, simplification and possible modifications of Melquiades amplifier.
Obviously you ha...
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Hi Romy,Further to my earlier message, I've measured the bias voltages for the driver tubes in all Channels.A -4.3V not adjustableB -13.82V not adjustableC -4.8V not adjustableD -4.2V (ran out of potentiometer travel...may have to adjust a resistor)E...
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[quote user="hagtech"] The issue I see is that of intermodulation distortion on the biasing of the output tube. It will effectively change HF operating point per supply ripple. Easy to understand if one imagines a gross ripple of 50V.&nbs...
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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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Welborne, I do not think
that I can give you an expert answer. You see, the gas tube biasing around 6e5p
was in a way an accident. It was something that made the 6e5p to sound very
interesting but I am not convinced that this type of biasing will ...
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I'm thinking about trying to put together a Melquiades amplifier for myself. I printed out a copy of the schematic (thanks for sharing). I have a simple early question. Both the 12.6 and 6.3V windings for the filaments are shown as being center taped...
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[quote user="anthony"]Hi Romy,So, six channels are now operational in the first DSET. By up I mean the anode voltages on all tubes is about right and the currents are in the ballpark of where they need to be. I am yet to check the DC Offset so hope...
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Inhaling Melquiades for long time. But have feeling about dset again. Started experiments years ago and abandoned. have full one stage 6e5p blocks all proper Melquiades way. except misplaced output trannys or maybe never had right ones. What Amorph...
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My wording was bad. I am building zarathustra but am a long long way from completion. I do not have the capabilities to just whip one up. Yes the 6n1p was from the old days when i thought i had discovered good sound, i'm sure i still don't know(but...
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I am not the person to speak about the 6E5P but I have messed with hybrids. If you want LF power, I can say I've heard some pretty simple plate amps that "work" at LF. It would be helpful, and it might even be necessary for you to tell more about you...
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[quote user="Celsius"]The problem is that my target is drive a 211 as full amp, and my CD player give a litle bit more than 1v to grid. What do you think 1V x 33times x 2.8 give 93ppV enought to drive the 211. [/quote] Well, you need another ga...
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I had some free time which I'd decided to waste with this "project".For some unknown to me reason (I'm an idiot when it comes to filters)the Sallen Key topology needed one more 12AX7 stage, unlikeI happily drew some posts ago. The resulting SPICE'd p...
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