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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="Romy the Cat"]The events of the last 3 days are incredibly stupid, incredibly interesting and very educational. During the last few days I have discovered some very interesting phenomena, ok might be no a phenomena but a behavior, th...
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Like anything else in electronic design, it is all about compromises. No resistor is an ideal resistor and no audio circuit is an ideal audio circuit. I remember when Meridian Audio came out with their active digital speakers in the mid-80's, and I h...
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Hello Dima !!!!
At point D I have 0.920 mA ... at 198v on pin 4. 238v before resistor R22 and 200v after resistor R22. On pin 5 I have -82. There is 82mV across the R21 resistor. I noticed that when I turn the VR2 potentiometer, thus inc...
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Options are limited here... looking at the schematic, you're sorta pinned in by the biasing topology used. One typical method would be to use a resistor divider network at the input grid to the 6E6P. Problem is, this results in a huge bias offset. By...
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I was searching for an answer why squire wave is so screwed and I was advised by the site’s visitors that it is due to HF restriction of my channel. My HF response does look too low to me – the 23kHz; with all my ultra low capacitance magnetic I ...
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Romy,I hate it when I realise I need a different transformer...The following is not an ideal solution because it breaks one of the Melquiades design features, but may be worth trying - cathode bias on the output stage? You could burn up some vol...
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I made today an experiment trying to remove the wirewound LPAD attenuator from the MF’s channel secondary. I was VERY surprised how much better it was with no attenuator. I knew that it was not optimum but the degree it ruined sound was a big sur...
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Do you use input 50KOhm Z-foil resistor between input tube greed and GND?Does Z-foil sound colder compared to Dale RN60D?U used Dale before. Now I use Shinkoh tantalum resistor. It has similar to Dale tonal balance but sounds smoother.I heard a lot o...
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After all, I faced a problem where I did not expect it. The MF channel with no wirewound LPAD attenuator sounds more extended but at the same time not all of that extra HF too useful. In fact, what I hear is that with the series resistor Sound ha...
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R22 is there to drop the B+ to the correct level and needs to be rated so it can dissipate quite a bit of power i.e. heat. It is 12 watt in the schematic but maybe the one you are using is rated lower or perhaps you have a higher secondary voltage o...
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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 hopefully that goes ok.Ini...
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Romy, thank-you for your help so far. Unfortunately I now have some more hopefully simple questions regarding the "pre-final" schematic from your "6 Channel
Melquiades" thread (see below). 1.
Do you have a “final version” of the
schematic any...
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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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The value/type of the capacitor after the gas tube hugely affects sound. I made quite a number of experiments in past with those caps and I have no idea why it is so. Well, I hardly understand (and I did not see anyone who does) why the “gassed resis...
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[quote user="Romy the Cat"]
It look like the project progress well. I have a little concern
about heat the will be building up in your PS enclosure. I do not know what
kind ventilation hole you have in there but be advised that it will be quite
...
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Hi,[quote user="morricab"]As to the best transformers souding more transparent than the best resistors, I'll believe it when I (don't?) hear it. You claim to have heard this but I most certainly haven't. [/quote] Well, the claim is no...
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[quote user="floobydust"]Plate supply = 350 voltsOPT Primary impedance - 3.5K
Cathode bias resistor = 866 ohm
Cathode bypass capacitor = 50uF
Grid resistor to ground = 249
You need to select a new OPT.... I would suggest the H-20-3.5U.[/quote]I b...
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Or whatever you call it, it says there is no sucha option that I make a connection error, but hey..., I'm 41 years old and I know from experience that sometimes this voice is wrong ...
As I mentioned, I am not in the apartment at the mo...
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[quote user="morricab"]…. putting the attenuator AFTER the gain stage has negative consequences for the sound….[/quote]
Well, yes and no. In the new 6 channels version of Super Milq I will be use 2 stepped attenuators: for Injection Channel and for ...
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Romy,I used second tube grid resistor, 1.8Meg Holco. (I couldn't find 2 Meg chip and good quality resistor: Dell RN60D or Holco or even Caddock MK-132.)But I felt the deep bus was cut. I tried 1.8Meg Holco & Riken 220K in serial. The deep bus inc...
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Erik, I do not think a resistor in series would do as it will burn on itself some voltage and the coil will be driven by the same voltages. It would be good to put in place of the resistor a rheostat and to slide it up and down while slide up and dow...
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Manufacturers do not recommend any specific loading, and it they do then they shell not do it. They recommend a region where most probable final loading value might be. In case a transform is use it make not difference; they just transfer impedance i...
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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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[quote user="Romy the Cat"] Celsius wrote: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. Well, you nee...
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Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source? I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving ...
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Interesting Romy, particularly the "echo" affect and weird overtones with the aircap. I wonder if the thing is picking up resonances and if the impedance issue is responsible for the overtones... signal being modulated by the varying input capacitanc...
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Hi Romy,I too have for quite some time been on a quest for a truly transparent preamp. To this end I have tried some that were indeed very good such as the Silvaweld SWC 1000 that I now own and especially the Vacuumstate RTP-3d from Allen ...
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Adrian, Fair enough... it's not about power or gain in your case, just making it sound as clean as possible. Well, if you go back to my earlier post on findings, I list the basic operating values. Just to recap them here:Plate supply ...
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[quote user="cv"] I've only heard the 801 in class A2, but I can easily imagine that the 10Y or 801 with nickel output would offer the purest possible sound in the 1k-10k range, such that it is the S2's true voice you are hearing. It's something ...
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Got today the parts and finalized the “perfect” Bessel passive crossover for my new channel. The coils are regular air-core 2.5H and 7H, the caps are Theta 10uF and the small wirewound tuning resistors that kills ~1.5dB in the channel. When I pu...
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