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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="op.9"]Could you help me understand your biasing scheme with this version? I thought I understood the original Milq circuit - but the only channel that looks like that to me is the D channel. I don't get A and B at all! what is the 50 ohm...
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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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The reason that I built the 6C33C preamp was to explore the 6C33C true musical potential like I did with the 845. Not only did I compare the sound of these tubes in power amp, but also in preamp. The reason is that with power amp you might hit some l...
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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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Yes, Jim, you put it very well. Still in case of the 6C33C it only possible to cool the glass and I made experiments blowing a strong flow to the glass and it did cool down the plates. The problem is that it is not a good idea to apply a strong flow ...
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[quote user="joaco"]Hello all , i know this topic is almost about pp experience but since im experimenting with electricity i like to share some thoughts here . I builded a dac using very high quality components . As you know the power supply is crit...
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[quote user="serenechaos"] How were the Macondo's Axioms arrived at? By listening? [/quote]I would encourage you to read carefully the following page:http://www.romythecat.com/MacondoAcousticSystem.aspx[quote user="serenechaos"] I am wondering ...
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Yes, Chris, thanks.
I understand how it works, the same Newton Bias only on the other side of the driver’s tube. Dima have proposed something similar in past and last nigh we discussed with him what you suggested. He was planning to post his commen...
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Gintaras, yes, the 10.5mA was a bit too little for gas
tube, 21mA. If you look at the stability of voltage regulation graph for these
tubes then you will see an ark with 15-20ma being atop.
I do not understand why you keep asking me R13
& R...
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Interesting….. It is interesting to think about the relational of Melquiades slow take-up. I think that major contributing factor is that guy who calls himself Romy the Cat. Really, I think it’s it. The people who are capable to build amplifiers more...
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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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The new Super Milq’s input with combined filer and bias resistors.
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[quote]Is this one of those shining moments?[/quote]It could have been. The theory seems pretty reasonable to me at the moment. Time will tell. I'll make up a new adapter card that runs both sections and add a pot to negatively...
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To my surprise it is going along not painful. I do it a half hour per day – only when I am in a mood - and I do not feel abusive with it at all. At this point the half of the bias chain of the third of the filters have installed. If it go further so ...
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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="rowuk"]I am always a bit hesitant to buy into "listening descriptions". I am a musician and am confronted every day with Sound bias - attraction to what we are accustomed to, expectations being confirmed. We are creatures of habit and mo...
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I was telling somewhere that in case you have built Super
Milq then you need to label everything. My Milq has test point at plates of the
first tube, the bias and plates of second tube. It means 3 test points per channel,
time 6 channels it makes ...
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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 your driver stage, wish is ...
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Romy, Some very good points here... if I downloaded the correct schematic from your site for the 6-channel Melq amp (also has the term DSET in the title) then you have created a 6-channel SET amp with built-in crossover points. Your first ...
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That's a tough one.... the 6528 is on par with the 6336 dual triode (30 watts dissipation per section) but is overkill for a couple watts. It does have a mu of 9 which is quite high for a large IHT dual triode. It should easily drive a 1K load,...
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[quote user="drdna"] The VERY INTERESTING idea is that the introduction of noise as a dithering element for the analog signal (for our brain to decode) can be helpful in increasing the retrieval of information vital to conveying the Sound. [/quote] T...
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I am familiar with the fresh 6C33C behavior, and I do set bias much lower while burning them in. This set of tubes has been installed for about 3 months; the amps are operating about 45 hours a week. Before switching them on the next time, I'll t...
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Gintaras, basically it is not bias voltage
problem but voltage drifting +-10mV with preamp disconnected. The 10mV is absolutely
irrelevant voltage. You see, the gas tubes are voltage stabilizers but they are
not as precise as the SS stabilizers. T...
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Actually I do not have the instability issue sorted out completely...I'm talking about circuit instability now, not the tube instability. Let us imagine all tubes are rock stable.As I see it there are at least two major sources of instability, in the...
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Romy, I appreciate that this is an old thread now and that you may not remember everything from your time developing these amplifiers, but I have a (hopefully) simple question about the upperbass crossover in the schematic above. All other channels ...
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Alex, have you killed your ham finally?What was the source?[quote user="AlexBerger"]Is the filament ground connected to the common ground?[/quote]Of course! Otherwise the fixed bias would not work. Moreover it's connecteddirectly at the V2 to minimiz...
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[quote user="N-set"] Sorry Romy, I did not want to sound nitpicking. I'm rather trying to understand if my copy works +/- properly.[/quote] I do not see you nitpicking, you do the right things and I wools do the very same if I was at your place. 1V...
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Jim,
in my corrector (Dima’s design with R2=50R) I made many experiments adjusting the VR1. Dima proposed 150V on 7788 plate purely arbitrary, what he did it he never ever seen 7788 and it was just a concept RIAA for him. After it was built and I p...
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I didn't see Magico in Breuninger's Winners Circle in the link above. An oversight or an unhealthy bias against Taiko drums??As for Guy Sergeant's comment about the demo choices, I assume those kind of artificial sounding mixes are done on purpose as...
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Yes, it is a bit confusing, as I meant to say that it will be a half of capacitance, I said it twice and it looks unclear. Still anybody understands how series capacitance works. BTW, it was a standard practice in before 70, before industry made by-p...
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