6c33 tube connectors
Pic1 - Box1 - Box2. This is a 2A3 from the early 's but with 6. All other data is fully equivalent to 2A3. MINT Quality item. Why trouble yourself with so called NOS 2A3 that are expensive, and perhaps not really good? Very large, double getter flash.
We are searching data for your request:
Wait the end of the search in all databases.
Upon completion, a link will appear to access the found materials.
Content:
Vacuum Tube Amplifier 6S33
Too stunned, it turns out. A good rule to follow is to always thoroughly inspect the teeth of gift unicorns and to examine all perpetual-motion machines for a hidden battery compartment. I know, far better than most, that the world of SPICE shelters many unicorns, magic beans, and golden eggs: capacitors, inductors, resistors, constant-current sources and voltage sources that we can imagine, but cannot buy, as they do not exist.
The perfect and the ideal reside both in our mind and in SPICE; the good-enough and the close-enough dwell in both our projects and the real world. For example, a real pF capacitor isn't too far behind its SPICE counterpart, being only slightly blemished with some effective-series resistance ESR and effective-series inductance ESL , as the capacitor's leads themselves will present both unwanted attributes.
When designing any type of tube-based power amplifier, whether that design process takes place on a paper-pad or in SPICE, we should examine the tube's plate curves.
This set of plot-lines reveal how much current flows at a given cathode-to-plate voltage with a given grid voltage, with cathode-to-plate voltage smoothly ramping up, while the grid voltage jumps in fixed-voltage steps. This is fantastically useful information, although it tells us nothing of such desired attributes such as "drive" and "punch" and the all important "slam. If you are applying for a government grant, refer to it as Hepatoscopic Heuristic for Preauditory Sequacious Cyrenaic Evaluation.
The most important plot-line is the 0V grid voltage plot, usually the first plot-line. This line reveals the maximum current swing the output stage will produce, assuming that we abide by the limits set by not allowing the output tubes to enter positive-grid conduction.
This is a reasonable assumption, if the output tube grids use coupling capacitors to connect to the rest of the amplifier circuitry. For example, let's say we are designing a small push-pull OTL amplifier that must deliver a peak current flow of mA into a ohm load. Almost a decade ago, a friend asked me to help him design just this OTL amplifier to drive his inefficient planar headphones. Just as I had suspected, he had enlisted the aid of several tube luminaries, as the circuit kept mutating with each email he sent me.
My answer was that before I head out on a long road trip, I like to consult a map; others, just stop at the closest market and load up on tasty snacks before entering the freeway. At one point in the OTL design evolution, it sprouted an output transformer and a topology identical to an in-production W high-end tube amplifier, the KT88 tubes replaced by 6DJ8 tubes, as a new tube guru had joined the fray and who had just have happened to have designed that very same W tube amplifier, alas his joining also marked my departure from the group project.
Too many chefs…. Interestingly enough, this guru's overriding obsession sought the widest high-frequency bandwidth possible, but he never realized a fundamental fact: to charge and discharge capacitance at ultra-high slew-rates requires current; instead, he could only think in terms of series resistance and shunting capacitance in an RC filter, so he strove to achieve the lowest possible output impedances throughout his designs, but paid no attention to current delivery. In fact, I ran several SPICE simulations on the W amplifier topology and I found that I could improve both stability and bandwidth by removing some of the cathode followers he had needlessly added.
Here's an example, if we must drive 1nF of capacitance to Vpk at 20kHz, then we must provide at least That is a lot of current, as many high-end tube products draw less current for their entire circuitry. If the current is not available, it doesn't matter how low the series resistance is. In other words, a 12AX7-based cathode follower that offers a low output impedance of ohms will not cut it, the most that its meager 1mA of idle current can do at this 20kHz and against 1nF is 8Vpk—and even this peak voltage swing is wildly optimistic.
Since many readers expect me to say that when designing a power amplifier we must start at the end, I won't disappoint them; start at the end. We know instantly that since 0. This is the starting point with imaginary perfect output tubes that exhibit an rp of 0 ohms and gm of infinity.
Until our politicians get around to passing a law mandating the creation of such an output tube, we will have use actual tubes. Or put differently, we find the required plate voltage that allows the tube to conduct mA. We then make a list. If we are willing to place multiple triodes in parallel, then even the 6BL7 could be used, as four 6BL7 triodes in parallel will give us our desired mA with a reasonable cathode-to-plate voltage of V plus 10V. Why plus 10V? Do not forget the 10V dropped across the ohm load, as this 10V must be added to the cathode-to-plate voltage.
We can now apply other criteria, such as tube cost, tube sexiness, heater current draw, tube size, tube amplification factor and transconductance and plate-dissipation limits… looking over this list of possible output tubes, the 6AS7 and 12B4 are likely to the prove the best candidates. One 6AS7 per channel would do it, as would four 12B4 tubes per channel—the difference being that 6AS7 holds two triodes; the 12B4, one triode.
One tube that didn't make the list was the 2A3, which was perhaps a mistake. The 6AS7's heater requires Assuming class-A push-pull operation, the two 6AS7 triodes realize a combined transconductance of about In contrast, the four 12B4 bring in a combined transconductance of about So which is the better choice?
I would go with the 12B4s, as the more than two times bigger transconductance will greatly unload the OTL amplifier's input and phase splitter stages.
On the other hand, almost everyone will agree that a 6AS7 is far sexier looking than a 12B4. I have been told that since a 6AS7 looks like a 2A3, it must sound like one. But as my goal is to allow you to think like a circuit designer, not to force a circuit on you, the long introduction is just as educational as what will follow. We return to the beginning and my telling of my being stunned by just how well the SPICE simulations of the 6C33C-based circuits turned out.
A good rule. For example, none model positive grid current and most assume triodes with perfectly constant amplification factors mu. Real triodes, even the B and , exhibit a varying amplification factor. Is this an important failing?
It is if you are doing distortion analysis, as a constant amplification factor can result in zero distortion in SPICE simulations, which reality will certainly fail to deliver. I always add a fifth part, the ground, only because SPICE likes there to be a ground in each circuit. Note that V2 is seemingly inserted upside down; it isn't. We set V1's starting voltage to 0V and its ending voltage to V; we then set V2's starting voltage to 0V and ending voltage to V.
V1's step increment is set to 0. Are you not glad that you do not have to run each separately? Very pretty, but how accurate are these curves? Here the SPICE-generated plate curves are overlain upon the 6C33's actual curves derived from a curve tracer, which I found at the Audiomatica website. The madness of simulations or as the Ghost might have said in the play Hamlet ,.
Model most foul, as in the worst it is. But this most foul, strange and unnatural. SPICE models can be bad in two ways: overly pessimistic and overly optimistic. The pessimistic model is vastly better than the optimistic model, as it is better to build an actual circuit and be pleased to find that reality outperforms SPICE simulations than to be disappointed by reality.
Okay, returning to the 6C33 SPICE model, note the implicit assumption of a constant mu and the gross overestimation of transconductance. If such a triode existed, it would instantly become the new standard by which all other tubes and soilid-state devices would be judged, and invariably found wanting, as this SPICE model implies a triode with zero distiortion.
You might be wondering how my own True Curves math model of the 6C33 compares to the curve tracer-generated plot lines. Here is the answer. Actually, here is a further wrinkle. Here is a competing set of plate curves for the 6C33 from the Turner Audio website. He makes many valid points. So, where did this set of curves come from? How accurate are they? Why does the first plot start at -2V, not 0V? I decided to overlay the real curve-tracer plotlines atop the image above.
One small problem we face is that the red lines from the real curve tracer are arrayed in V decrements, while the image uses V decrements. The problem is small, as every other line should overlap. They don't. I went searching for other sets of curve for the 6C33C. Here is what its data sheet shows:. Note that it, too, extends from 0V to V, from 0mA to mA. Both graphs first plot line is at -2V and both graphs decrements are in V steps.
Both graphs X axis use a 40V spacing in voltage marking. If you examine a few points, you realize that the pretty graph was derived from the ugly graph. Is this a problem? It can be. Here is why: tube curve tracers are rare, particularly one that can handle 1A of current flow.
In fact, prior to the mid fifties, they were not commercially made. Yet, tube manuals, even ones from the s, are filled with plate curves. A paradox. No, not really. Here is what I said in post 48 :. My guess is that most graphs in tube manuals are not born of a curve tracer's output, but only the result of a handful of spot point data lists and a French curve and a steady hand. Consider this: most tube manual graphs existed before Tektronix came out with their famous curve tracer mid s ; what was used in its stead other than a high-voltage power supply, an ammeter, pad and pencil?
How do we know that the actual 6C33 that was used in the actual curve tracer was actually representative of most 6C33 tubes? The key word in that last sentence was "most. The average height of Chinese men varies from 5'6' to 5'9", depending on which part of China you evaluate. Yet, the world's smallest man and tallest man are both Chinese. In a college library, I once saw the most interesting book, as it was filled entirely with plate curves of commonly-used tubes.
What made it fantastically interesting was how the curves were derived. They had placed a big number, say 20, of the same tube, but from different years of production and from different manufacturers in parallel.
Ayon Audio Spark Delta integrated Tube Amplifier
With the ML2. The ML2. Implementation of these triodes allowed to create an output transformer with a very low turns ratio and, as a consequence, extended as compared even to the most advanced modern vacuum tube amplifiers frequency decade factor, as well as dramatically reduced leakage inductance. Whereas both — the ML2 and the ML2. The sonic result is a most seamless fusion of the ML2.
High Power SE 6C33C Amp
IIRC Roger mentioned the Futterman amplifiers have 7 adjustments with two pages of instructions to set up the amp. Roger simplified this by installing a meter with a 6 position switch so you can view the current in each tube and easily see if one is becoming weak or running too hot. There is also just one bias adjustment as the tubes are supplied computer matched. The only other adjustment is the bias for the driver stage and that is done on the same meter. LOG IN. Cheers George. Edit Delete. The 6LF6 used in my Futterman H3aa's is capable of decent current delivery.
S.I. Audio Cult/I integrated amp
Forums New posts Latest activity Search forums. Promoted Threads. Media New media Search media. Members Registered members Current visitors.
Socket - 7 Pin, Large, Ceramic Plate for 6C33C
Audio is a Neapolitan company and an Italian fine reality. Its founder, Eng. Fulvio Chiappetta, started his business designing and selling DIY kits. In next to no time, he felt the need of adding a complete and available production of audio equipments, becoming very soon a benchmark for the enthusiasts of tube amps and mains conditioners. The product reviewed by ReMusic is the S. It was devised around mid twentieth-century by the designer Julius Futterman.
TUBE & PRODUCT DISTRIBUTORS | Kokstad
Tube sockets are electrical sockets into which vacuum tubes electronic valves can be plugged, holding them in place and providing terminals, which can be soldered into the circuit, for each of the pins. Sockets are designed to allow tubes to be inserted in only one orientation. They were used in most tube electronic equipment to allow easy removal and replacement. When tube equipment was common, retailers such as drug stores had vacuum tube testers , and sold replacement tubes. Some Nixie tubes were also designed to use sockets.
Covers ID 26,6 - C 33 mm - 1 1/16 UNF/JIC - Yellow
The 6C33C-b is an attractive tube. The downside? The 6C33C-B requires a relatively high anode current typically mA at V a high heater current 3,6 A with filaments connect in series or 7,2 A with parallel connection. Due to relatively 6C33C-b low plate resistance, with a Ohm primary impedance output transformer we can obtain 15 W rms at V anode voltage and mA of plate current 40 W anode dissipation is a good safer choice for a 60 W max tube.
Too stunned, it turns out. A good rule to follow is to always thoroughly inspect the teeth of gift unicorns and to examine all perpetual-motion machines for a hidden battery compartment. I know, far better than most, that the world of SPICE shelters many unicorns, magic beans, and golden eggs: capacitors, inductors, resistors, constant-current sources and voltage sources that we can imagine, but cannot buy, as they do not exist. The perfect and the ideal reside both in our mind and in SPICE; the good-enough and the close-enough dwell in both our projects and the real world.
User Name Stay logged in? Of course I will have to drill up the porcelain to feet for the GM70 legs. Did anybody ever tried to use that? Do the GM leads would match with the socket? And it is much cheaper! Yes I know there are teflon tube socket but the price is not for me at least not now. If anybody has experience with these please let me know.
One nice day of September in , a Russian jet fighter landed at airport Hakodate in Japan. Please note, at that time Cold War was going on really. The pilot got political asylum; never-seen-before jet was examined and disassembled by NATO; then re-assembled and trailed home.
There are no comments yet.