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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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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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A small word of advice regarding wiring the 6c33c heaters.My DSET's have now have several thousand hours of use and I love them to death. I've not heard any amplifier able to do what they do. The first amp has over 10,000 hours now and has never fa...
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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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[quote user="JJ Triode"]Hi Romy, Well, I see in the photos what look like the newer Herbie's Hal-Os with the titanium rings on 2 of the 6C33Cs. Have you made any observation of the sonic effect of these things yet? Rgs, JJ[/quote] Truly, I did buy th...
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[quote user="Romy the Cat"]Ok, let dive a little bit further into my examination of the subject of Lamm ML3
What is important is to undusted that my view less targets the Lamm ML3 but rather it targets the ML3 as a representative of entire cla...
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Thanks, KM
It makes sense but I do not like to burn those tubes at max plate dissipation. How about if I put one more RC chains in PS and drop anode voltages from 400V to 350V? Then if burn let say 60V in cathode then I arrive to a comfortable...
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It is not the subject that I closely observe at this point but I have to tell you that paling with my new MF amp I do develop some linking to Chinese Shuguang tubes. They are pretty good and for $75 per pair new they are surprisingly good. I am not f...
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I already wrote a few times at my site about 6C18C. Search if you are interested.
http://www.GoodSoundClub.com/TreeItem.aspx?PostID=2292
If you use the 6C33C for amplification or regulation then you would hardly avoid attention to 6C18C. It w...
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[quote user="ghpicard"]Hi Romy, I wonder whether you could advance on the octal voltage regulator testing on the Milq, and what your conclusions were. As I have already seen Milq on your new home still with the 0A2s I can assume you weren't much sa...
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[quote user="electronluv"]are you asking if i like higher impedance tubes with my drivers i have always love the sound of imac tubes round plate triodes !!! i change amps alot right now i im running 75tl amp for highs and a 300B for bass drivers . ...
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I think the issue here may be how long the gear is "off" between sessions. If it's going to be quite a while between sessions, then perhaps having some juice coursing through there would shorten bloom time. It literally took seve...
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Romy, thanks, as usual, you seem to have been right. The system is on and I just checked V2 voltage; its way off, above .4VDC, so I grabbed a hot pad from the kitchen and rocked the V2 tube. The socket made the familiar a dry creaking sound and see...
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For many years I have habitually "rocked" tubes gently in their sockets (when the equipment is off!) in order to "better establish the electrical connection". I suppose I have done this hundreds of times with no problems, apart from three fairly rec...
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[quote user="Romy the Cat"]
[/quote]Somebody Breuninger bought Lamm ML3 and L1 to drive his Coincident and share his finding on TAS blog. Regardless how mature his comment are but there was something unavoidable – the wipe-ass professional with na...
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I Forgot they did this. I only have experience with se driver stage. You would remove r3 and c1. change r2 to 10k and put the bias voltage from the gas tubes across it. I would try just regualar zaruthstra srpp circuit first. Like do you know it wi...
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[quote]do two tubes at once then it make sense to have one selected reference tube[/quote]I see. Yes, the digital scope option would work. I have one, might try it out. With a 6c33, the VacuTrace has only enough power to trace ...
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Hi Jack ,Thank you for your very educational info ! It looks like you are right , and your tubes are rebranded SG13P .... Maybe a big stock of those tubes were exported , and you know them better than we do :-)And another question . You wrote :...
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I have spoken at length with Modjeski on a couple of occasions. He is very bright, indeed, and very well educated (MS in audio/elec. eng.), and he is determined to be well-compensated for his efforts. He tried once to make the "best"...
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This is classical common mode noise interference on a common supply. This type of noise will pass right through any power conversion technology and in both directions. Due to the timing variations, I would expect it to be a little bit of mains inte...
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[quote user="peter foster"] My understanding had been that biasing method is a method of setting up a given tube so it works with the wanted anode current at idle with the wanted anode voltage and these conditions are met by somehow applying a correc...
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While you are merely being empirical, there are actually plenty of devices that aim to "benefit" the end sound of SS gain by using tubes to "condition" the signal from DACs, etc. Also, there are plenty of commercial widgets out there that say they w...
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I have the Zu Druid's which Romy has referred to. I purchased the speaker's based on the presumption that their high sensitivity and impedance would be perfect to run SET amps. After having read the great success Arthur Salvatore had running the Fra...
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i know you are saying something Romy but i cannot ear you la la la la i am listening to my happy Sound Labs speakres and i am so peaceful la la la maybe now you are listening too so you cannot here me either la la la la no...
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Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from being best for the 6C33C...
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[quote user="Romy the Cat"]
As in physics the Unified Field Theory formed by Einstein does not have an accepted agreeable conclusion in audio there is no unified audio design ideology. It is not only no audio design ideology but there is no unifie...
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Daniel, if you have start, the igniting voltage, on the gas tubes 197V then it is perfect. If the tubes do maintain stable 150C then leave it as it. Each of the gas tribes has own stabilization voltage. If one of them has let say 148V and another 150...
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I have seen people use 12AU7, 12AT7, the circuitry might be tweaked and it will accept anything. I use a 7025 in second stage (look into the linked thread “Once more unto the phonostage dear friend!”). Hey, I even used a transistor as follower! I kno...
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Thanks, Chris.
Dima I discussed today many imaginable scenarios. Initially we thought drive a single 6C19P from MF channel of super Milq. But it has some negative consequences… Eventually we decided (it is not final decision but the final with 90% ...
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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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