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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy,
I ran the tube conservatively at 40W, because it is still breaking in, and I do not want to push it too much power to damage it (then I will have to break-in a new tube all over again). This amp can give max power at 20.35W (12.76Vrms into 8 ...
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The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does has a remote control. It i...
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Ok, I will try to lower the primary impedance like you suggested, but it will be on the new 6C33C mono block amplifier that I am building. The custom made chassis will be finished by next week and I have the better components waiting to get installle...
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Romy,The normal bias for the Golden Grid tube for 200V Plate at 200ma is about 70V-80V for the good tubes, the bad tube read 0ma at this bias, when drop to -30V it start reading some current, but can't get to 150-200ma current for the SE amplifier.Th...
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Hallo Romy, i'm interested with half triode at 6C33C , but im confuse how to set it,... Full Triode : pin 1&2 give 6,3v , pin 6&7 give 6,3v.Half Triode : series pin 2&6 1&7 give 12,6v or just use pin 1&2 give 6,3 vthanks before......
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http://www.sitefile.org/showimage/6/6c33c.htm
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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 because of insufficient ...
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[quote user="Romy the Cat"]Iraschwips , sorry that your post was deleted. The site
was hacked this morning, I fixed it and your post was the only casualty. I
restored it under my name and since you reported it we all set for now.[/quote]
That’s ...
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I actually took the remaining dozen of gold grided 6C33C from that eBay guy. It is hard to say what those tubes might be and it is most likely absolutely not necessary in my case. Still, I figured that to get a dozen of 6C33C for a price of a pair o...
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Totally disappointed today, while I was listening to music, the left channel make a small pop and quit. The bias meter showed about 25ma bias instead of 200ma. Test the tube on bench showed that the tube current stay about 25-50ma max. This tube is g...
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KOTriode, I got a feeling that your unfortunate experience with the few presumably bad tubes that and your former experience with DHT tubes made you to treat the 6C33C as it is some kind of fragile princess. Filament burned for more than 20 hrs befor...
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Romy,Nah, I just want to careful with what I have left, dont want to have an amp without tube for now. The gold grid tube probably take a while to get them. From what I remember from a tube dealer who said that these 6C33C need to have the heater bur...
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The transformer in this preamp was given from a friend who want to learn how to wind transformer. If I remember correctly it started out as UBT, they were bought (when UBT was operating in the Silicon Valley) at the company swap meet. They were rejec...
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Just in time. After about 5 hrs of music on the preamp , I received today the 3 golden grid tube. Looking with a magnifying glass, I could not determined if it is gold wire. Anyway, I am burning the heater and will try out tomorrow. Here are some pic...
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Romy,
No, the DAC was not set at maximum level (for best sound) while Cyrille listening to the system. It was set at normal volume for the whole system. When Cyrille dropped by, I was showing him the Field Coil open baffle speaker system which con...
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Hello everyone,This seems like the place where the 6C33C experts hang out so I figured I'd ask my question here.I'm currently collecting parts to build my very own 6C33C amplifier, and I had bought some of the cheap chinese sockets for it and thought...
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Paul, what are you talking about? I use from my 6C33C no more then 1-2W. The 6C33C at LF might give 20 W but it is load over to 600R. I load it to near 2500R (11.83:1 transformer with 15R driver) – you figure out your how much power and gain I b...
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The Melquiades give me inspiration to build this 6C33C amplifier. It's on a stereo chassis that has few unique features
- Vacuum tube rectifier separately for Input/Driver and Output tubes.
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[quote user="KOTriode"] The Melquiades give me inspiration to build this 6C33C amplifier. It's on a stereo chassis that has few unique features - Vacuum tube rectifier separately for Input/Driver and Output tubes. - Regulator using the same tube ...
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Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the regulators. It mi...
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With 6C33C output run at 40W plate dissipation, this amp run much hotter than an 845 amp with output tube running at 100W. I measured the hottest point on the bulb and it is about 380F. I guess the due to short bottle , the heat spread on the ch...
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Hi,[quote user="Romy the Cat"]could I instead of trashing the tube to flip it to the left filament and continue to use the unused part of the cathode, plate and filament? [/quote]Sure you could.[quote user="Romy the Cat"]Theoretically it might be the...
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Vp = 240v, Vg = -90v, Ip = 165 ma, RL=1k5, 10W, H2 = 6.9%, H3=1%, H4=0.2% I used it with cathode bias (used 50w resitor, backed by 10x200uF capacitor). How it sounded - warm and punchy. I had an amp with F-3 about ...
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I think you'll have trouble adding a copper sleeve to the power tube. The thermal coefficient of expansion for copper is probably much greater than that of the glass used. Hence, the copper will enlarge much faster and break the glass.&nb...
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[quote user="Genn"] Another issue of the 6C33C - short lifetime of the socket. I think, that ventilation will help to extend their lifetime as well. [/quote]It is not a problem with the 6C33C but with the stupidity of the very specific Russian ...
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Got today a party of the 6C18C from 1960s, an interesting tube. The plate looks like 1/4 times larger and has no bridge between the halves. The 6C18C has even less plate impedance than 6C33C and it appears that it futures inside more “colorful” metal...
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Amp at close to clipping level 20.4W, I am surprised that sine wave looked pretty symmetrical. Still has couple chassis left for the Melquiades, the problem is the 400V supplies which required extra power supplies. This interstage amp is so much simp...
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Paul,
I tried this tube in few other amps and also on a phono amp and I like the sound of this tubes, perhaps it matched with the speakers/amp combination better than other, still there are lots of other tube out there that I would like to tr...
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Forgot to elaborate the Quad system.It is actually a tri-amp Quad system, below 100Hz is the Supravox 15in Field coil in open baffle, then it's a Stacked Quad ,and about 5Khz there were 5 RTR ESL cell. I did try the 6C33C amp in a single pair Quad by...
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http://audioratbag.blogspot.com/2015/01/cat-vomit-special-6e5p-6c33c-parafeed.html
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