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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I can relate to your point about mating SETs with inefficient speakers. I guess since they don't sound overtly bad when they clip, some people feel they can be run with less dynamic headroom than SS amps require. The resulting compression probably ...
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Hi Romy,Am I misunderstanding something about the 6C33C?I had a look at the operating point you recommend for this valve in your 'full range' Melquiades amplifier. The way you are using it seems to give almost 20% THD.Does this sound good or is it ju...
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Iraschwips, sorry did not see your post. Anthony is basically
right, it does not matter for this specific application of you have center tap or
not. It is also not really important if you connect filaments on 6C33C in series
or parallel. There is ...
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[quote user="Paul S"]I also wonder about the supposedly simple but ever mysterious procedure for matching 6C33Cs for gain. Presently, my amps are ~ 2 dB apart.[/quote]To do gain matching we need a way to measure gain. To be precise, we need to measu...
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Romy says:[quote]The problem is that in context of those amplifiers the COST BECOMES THE MAJOR DESIGN IMPEDIMENT[/quote]Yes, but it shouldn't -- should it?Let's be reasonable (a tall order). Either a designer knows how to design or not. If he doesn;t...
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[quote user="Paul S"] Does anyone know the voltage the big couping caps actually see? Yes, I should measure it, but I would rather avoid the drill of opening the amps, propping them up somehow and measuring if someone already knows the answer. Of co...
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[quote user="decoud"]it is worth reiterating in this thread -- and perhaps Romy should update his advice in the relevant section -- that exotic japanese teflon sockets such as the one made by yamamoto soundcraft are no good for the 6c33c, whether bec...
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A little update on the Milq amp.After sorting some of the problems with the amps transformers (see posts above ) .I now have two mono blocks operational that have about 700 hours ,I'm so glad hour meters were installed .Filament voltage is spot on 6...
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It is very nice and indeed and
under normal circumstance you will not need any permanent multimeter. It is for sure nice to have it when
you put a new 6C33C in use as plate current run wildly while the new tube is
burning in. It is still OK to do ...
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Hm, it is interesting. The loud popping pings in the lower MF and upper bass region are unmistakably signs of the 6C33C be gunner. Then you replaced the tube and the pings are still there. It is very highly unlikely. You might burn a cap that interm...
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[quote user="Paul S"]If this is the case, then the Morons will effectively have less rather than more power unless they are more careful than usual to match the loads, which seems like the opposite of "what the Market demands". Cranking up the NOS 1...
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Novygera:If you have a transformer where the impedance primary-to-secondary is 5K:8, it means the turns ratio is (5000/8)½ = 625½ = 25. This is the ratio by which the voltage is stepped down and the current stepped up in going from the tube to the s...
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[quote user="decoud"]…. but nonetheless it *is* a set of horns and driver without which it is impossible to give body to the ideas that you talk about. Someone who has not heard the S2, for example, in the way in which you suggest one uses it, would ...
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… I do not consider it as an interesting driver and I have a good feeling that you will review your desire to drive 2A3 with 7788. 7788 is phenomenal for different application (ultra low noise + ultra high Mu) not for driving power triodes. Jim, if y...
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[quote user="decoud"]I am getting the components together for the full range version, and I was wondering if you would be kind enough to consider making available the drawings and the manufacturer for the enclosure. I rather like your design, a...
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[quote user="Paul S"] Pretty clean, Romy (and one hellova tranny at Fundamentals)! [/quote]
50mA, 60H, LL1623 Amorphous
[quote user="Paul S"] I thought you said Vishay metal foils in your earlier response about bias adjustment?
If so does that me...
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Dominik. There is one more factor that I forgot to mention. When you will be looking at your choke for your B+ of the output stage then relate it critical current to the amount of the mA that you asked the Tribute guy to guy your transformer. If Trib...
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This morning I went to MIT Electronics Fleamarket and found something quite fascinating: the RCA made sockets that fit 6C33C. I use Johnson’s sockets (I believe 273-275) that although are more expensive but they hold the 6C33C’s pins horizontally and...
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Interesting that over the last month it is the third projects where people use 6C33S in preamps. A few days back I have a correspondence with Dutch guy, know to audio hoodlums as Direct Heated Rob:
http://www.dhtrob.com/index_en.htm
...who told me ...
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A few days ago a friend of mine and I did spent over an hour to fantasize what might be done if the ULF tube SET is planned. It is not so simple as to drive the tube like 833/GU-48, you will not be able to do with Milq driver. But I also would like d...
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[quote user="Romy the Cat"]I do not know how the battery operation – I never was too warn with this idea but to have a small Solid State single-ended amp with put transformer sounds to me very nice. I wonder if anyone looks in this direction. I do no...
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[quote user="cv"]Not to start a pissing contest, but how are they wired (series/parallel?), and with what voltage across them? Something just can't be right; the makers spec is 88db / 2.83V, which is over 1W. Unless it's uniquely smooth room gain wit...
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This is very interesting subject.
I expect that tghe new Midbass horns will have somewhere 108dB sensitively anechoicly. The driver is 99dB and the hyperbolic curve has much more EQ then Tractrix and that is more important the EQ that work mu...
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KOTriode, this is not the subject of this thread but I would like to point your attention to one aspect. From one side it looks like you with some kind of special pride talk about your Tango output transformers. From another side you are stupid enoug...
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DA, I would not use any switched power supply, not to mention that they do not need to be regulated for LEDs, relays and fans. I do not know if you build a full range Milq or more complicated multi-channel version. If it is a full range Milq with onl...
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Just finished one mono block 6C33C SE amp.To keep things simple (power supply only need 220V), I used a single driver tube (the second tube is there for backup if not going as planned) through an interstage transformer...
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You need to know that I consider Paul’s finding absolutely ridicules. The 6C33C are very reliable tubes with surprisingly low for Russian tubes defect rate. You juts was unlucky or most likely the person who sold to you your party of tubes...
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My system can be viewed here https://www.youtube.com/watch?v=GiIzpv_R-W8My front end TT and R2R. You can see the upper bass horn built using Fane Studio 8M on the other side of the Duo.Tribute OPT and Nichicon PS capsPS Board insituPower supply board...
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I haven't tried to build a Melquiades but I understand tube electronics decently, so I'd like to comment on this problem.The main question is why Domidaw's output tube is apparently carrying 3 to 4 times as much plate current as it should be. It is p...
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What speakers are your using? The “4R at about 80 Hz before going back up their average 8 Ohms at 30 Hz” is not good for SETs. I prefer to have 16R and do not let it to drop below 12R. Lamm is quite fixable with loading, probably because ...
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