It has two of the extremely popular 6080 power tubes, two 6922 type driver tubes and two ez80 type rectifiers. My amplifier is in for repairs and my tech would like to see the schematic. My objective was to assemble an audio system that reproduces a natural and believable sound. There are times however when we may need information from you. I build it and tested with the 300b, which is great. Back in 1947 a team of american physicists named john bardeen, walter brattain. Sonic frontiers were once my employees chris johnson and john sloan. The 300b is quite hard to drive and benefits from a hefty driver tube, which tend to have relatively low mu. An additional gain of about 20db is provided by two sections of a single 6sn7 connected as an srpp amplifier. A visit from border patrol and living voice parttime. This is the circuit i am proposing for each 300b heater. Chokeloaded triode direct coupled to dht driver, transformer coupled to the pushpull 300b output tubes. The device operates in standby mode, run mode, or brake. Used the high mu triode as the driver in a feedback pair combo.
Throughout the world, there are dealers to serve agricultural, construction, lawn and grounds care, and offhighway engine customers. Lets resurrect the 300b single ended amp diy hifi wigwam. Main system is klipschorns, bedroom system merlins. Getting a dht set amplifier was a big and effective move towards that goal. Rotate all amps and dacs through main and bedroom systems. On the front you can find the power switch and volumeinput selector together with the single ended headphone out. Byw, the benefits that you got were so far not the 6e5p advantages but you juts stopped to use absolutely not appropriate tube 7788 to drive your 2a3.
Feb, 2008 here you will find archives of projects involving single ended tube amplifiers, such as 1626 darling, 6as76080 lilliput, je labs 300b, we91a, je labs 2a3, getsetgo gsg amps and more. I listen to music at home often and for long periods of time. Right click on the beo6 and select update driver software select search automatically for updated driver software you will get a message which says windows cant verify the publisher of this driver software. There is no best tube, in general, considering these criterium, as each tube will perform differently under these different conditions and also according to your own personal taste. We got the new prototype up and running, but with large amounts of heat being dissipated in a relatively compact chassis, running tests showed that after 12 hours or so the chassis was getting hot.
Tube compliment 6em7 super tube for input so much current capability it has its own power supply 300b driver tube for utmost purity no pentode tubes used in this dht design dual 211 output tubes in a push pull configuration which dramatically lowers distortion and provides huge power reserves. Oct 06, 2010 a terrific 300b set amplifier that is the foundation of my system. I strongly advocate a simple, linear driver with large voltage headroom. The driver i developed was a cascaded 12au7 design discussed here brassboard prototypes and here set driver revisited. Tubes with high enough mu to use single stage and a low plate resistance like 6c45, 417a, etc. This gives the amplifier the subjective headroom of a 30 100watt amplifier, not what youd expect from 300bs. The driver is so powerful, it doesnt mind the onset of powertube grid current and the 300b stays linear as it enters the. So using this prototype driver, i proceeded to perform some prototyping. This unit uses vintage webster output transformers and power transformer.
I personally would not paint with a broad brush in regard to vintage tubes. I was told by some very experienced tube nuts that the best 6sn7 is the earliest version of sylvania vt231. The driver is the small signal triode section of the 6em7. The woo audio 2 uses six tubes in total and that gives you hundreds of possibilities if not more for tube rolling.
Im using a svetlana 300b for now, and the 211s are nos ge. Welcome to usaudiomart, in this section you can find used tube amplifiers classifieds. Stepbystep instruction on how to configure the s7a driver and the plc for unsolicited data transfer. The result is the fatboy 300b amp named as such because, like me, it is a tad overweight. They sound more like 150 wpc because of the huge power reserves of the 211s, says mr. Goodsoundclub romy the cats audio site the 6e5p tube data. Driver tubes have to confront the shock of powertube gridcurrent whenever the. Step7 demo project for unsolicited data transfer to the s7a driver. Ncv7702b 1 a dual hbridge driver this dual fullbridge driver ic is intended for 14 v automotive stepper and dc motor applications. Steve rochlin, a charming el84 integrated tube amplifier, with. Each heater supply must float approximately 71v above ground and will be ac coupled to ground via the driver stage cathode coupling capacitor. Canton will be demonstrating their highend reference 3.
Its four halfbridge outputs are configured as two channels and are programmed by six ttl compatible inputs, allowing flexible control of bridge operation. Please note that the heater circuit is not grounded in any way. Nov 04, 20 the 300b is quite hard to drive and benefits from a hefty driver tube, which tend to have relatively low mu. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. The immediate challenge and probably the reason why it hasnt been used extensively in the past is that has a high. Single ended triode amplifier with an output transformerless design for the higher impedance headphones in theory. Dont really have enough voltage headroom to to the job properly with low distortion, imo. The tone,timbre and harmonics are very well rendered. I used tango nc14 interstage and fx405 output transformers, which ive had around for a while. Obtaining this amplifier lead to a permanent change of perspective as to how i listen to music with increased appreciation. Comes standard with the finest quality, tested and matched psvane 300b tubes. Well, the driver can drive the 300b grids 30 volts. As the cathode swings up and down in voltage, so, too, will the grid2 voltage, for the large electrolytic capacitor maintains a.
Each amplifier uses two power transformers, all class a the 6em7 input tube requires its own power supply, thus the second power transformer at the input stage. This driver has high gain, large output swing capability over 100v, and good distortion characteristics. It features not one but four inputs and one rca output on the back as it also is a preamplifier. Apply to driver, van driver, assistant director and more. If this package has been installed, updating overwriteinstalling this package will fix problems, add new functions, or expand functions. The clean output power from the 6em7 set amplifier is 2. The 6em7 driver 1950s and mullard rectifier early 1960s tubes in my current 300b set are both vintage and very good. They feature a 6em7 super tube for input, 300b driver tube no pentode tubes used in this dht design, dual 211 output tubes in a push pull configuration to produce 80 wpc. Feb 06, 2008 here you will find archives of projects involving single ended tube amplifiers, such as 1626 darling, 6as76080 lilliput, je labs 300b, we91a, je labs 2a3, getsetgo gsg amps and more. These are tubes that you could use as a singletube driver for an set, for example. John and steve benchs trex amplifier design provided the template and dave. Matt describes the design and construction of a 6em7 singleended triode set amplifier.
The tube i use is the noval almost exact equivalent to the octal 6em7. Amplifiers tended to be flat chassis with tubes and transformers above and electronics below. I tried several driver tubes with wide ranging results but this beats them all. The singleended 6em7 ampifier is housed in a vertical wooden chassis styled after early tube equipment of the 1920s. The tests here were done with the 300b amp driving the dtqwt speakers and frontend was. The mighty 300b driver tube is used to maintain complete dht circuitry. About passive components types, here i have used normal metallic strate resistor connected in opposite phase to search a compensation of their inductance and elna cerafine capacitors on cathode and power supply. So here was the 6em76ea7, representative of what might be termed a family. Goodsoundclub romy the cats audio site the 6e5p tube. John hogan 6sn776300b set amp vintage transformers, rich. As a company, we are dedicated to keeping our dealers equipped with the necessary products and services to maintain this leadership role.
Looking back at most of my tube designs, and most of those on the internet, revealed a very typical pattern. Jun 04, 2017 this will be another valve to try as a driver in my next 300b project. Singledriver pentode test data pete milletts diy audio pages. Add in an amp leveraging some truly great 300b tubes, and that extra focus extended from 2d to 3d. What really drove me to build this 6em7 amp was an idea about amplifier layout. Any personal information that you may give us including your email address are used in the following ways. The amplifier design could use either a bypassed or unbypassed cathode and still get the gain required.
All classified types all sale ads for sale best offer for for trade for sale or trade wanted auction dealer. As such, section one becomes the signal amplifier and driver, and sec 2. Our us engineers further tested these selected tubes and classified them into 3 grades. John hogan 6sn776300b set ampthis is a john hogan built 5u46sn776300b single ended triode stereo amplifier. Below is the final load line design for the 6em7 driver stage using the same data sheet referenced above. The second installment in the driver series was released for the playstation on november 2000 in the u. I end up decided to build the electraprint drd 300b. All needed voltages do have there own power line consisting of power transformer rectifier snubber coil capacitor coil capacitor. John, i am very much not in position to argue with your about tubes but to use 7788 at line voltage as a driver is absolutely beyond my believe in mankind sincerity. It is an enjoyable and emotionally involving experience.
Net learn how to use this driver with your environment. We cherry picked the best tubes from the production for the us market. The beo6 will be selected but will have an exclamation mark since the driver failed to install automatically. I thought the rca red base 5692 is the ultimate driver tube around. Sophia electric premium 6sl7 inputdriver tubes not all tubes are created equal.
I received a tip from john atwood, the previous technical editor at vacuum. The tube compliment includes the 6em7 super tube for input and 300b as a driver tube. Tube amplifiers used and new classifieds us audio mart. Even if the first stage is a dual triode, sections connected in parallel, performing the same functions, it is a two stage amp. As a driver, i like to use a d3a strapped to triode. John hogan 6sn776 300b set ampthis is a john hogan built 5u46sn776 300b single ended triode stereo amplifier. This configuration consisted of a 6sl7 input tube, 300b driver, and 845 output. In true pentode operation, grid number 2 is at a fixed voltage relative to the cathode, even when the pentode is used a cathode follower circuit. Usually that means a single triode with a high plate voltage and a high load impedance choketransformer, or current source. I would however caution the intrepid 300b hunter that the topend energy of the create audio power triode mandates proper matching. However, by going with the bypassed cathode the amplifier only requires. Singledriver pentode test data pete milletts diy audio. The immediate challenge and probably the reason why it hasnt been used extensively in the past is that has a high anode resistance as well as very low current capability. Keysight technologies agilent technologies ag663xxa.
Register today and start sellingbuying tube amplifiers and other audio gear. You will also find push pull amp projects, including. It has dual volume controls one for each channel and hum pots for the output tubes. John hogan 6sn776300b set amp vintage transformers. Here, with the tweeter offset, we get another interesting twist in the design. Coincident frankenstein markii 300b mono block, uses 6em7 as inputdriver also has an interstage transformer. Use our ivi class drivers in conjunction with this driver to create interchangeable instrumentcontrol applications.
This is an extraordinary amplifier with natural tonetimbre,very dynamic drive and just excellent realism. The driver is so powerful, it doesnt mind the onset of powertube grid current and the 300b stays linear as it enters the positive grid region. Jun 04, 2011 coincident frankenstein markii 300b mono block, uses 6em7 as input driver also has an interstage transformer. The best one is the one that sounds the best in your amp your circuit and your system, to you. Again, like the 6080 set, its a bit crammed, but the layout is well thought of before hand and minimal wiring is employed. The use of driver transformers is a major difference between our 300b amplifier and most others. A pair of high output 211vt4c output tubes operate in pushpull configuration. Israel also makes the dragon we love these dramatic names 211pp monoblocks. The next most important thing is the driver stage, in my opinion. Theres a wide spectrum of performance among them and all are not superior to current production tubes. Ive been running a few tests on some reasonably highgm pentodes, in pentode and triode mode. Documentation for option digital signals with timestamp s7a 7. The input and driver stage is the dual triode 6gl7 or 6em7 with highmu unit and lowmu unit datasheet 6gl7.
Driver is supported on both 32 and 64bit platforms. Chose between 12b4, 6s4, 6ah4, 6ck4, 1626 too old to reply andy evans 20050406 10. This is why the input, unbalanced, is located up at the front of the amp instead of the back. Mainly listening to roon with tidal, qobuz playlists and cd rips via synology nas. Pair of cary 805c amplifiers, originally manufactured in 1998. The 300bdriver is essential in these amplifiers for the output triodes want to see a very stable driver.
These two things will go a long way towards achieving your goal. Here you will find archives of projects involving single ended tube amplifiers, such as 1626 darling, 6as76080 lilliput, je labs 300b, we91a, je labs 2a3, getsetgo gsg amps and more. Here the quality of the driver tube and how it interacts with the output tube becomes vital so the general sound is fully fleshed out and sufficiently anchored down low. Its a pushpull design, using two 211 dht output tubes, with a 6em7 input tube and a single 300b as a driver there are no tube rectifiers.
43 1476 160 55 405 788 336 258 503 1033 297 21 739 513 191 170 651 103 541 917 1356 1419 1126 1182 1666 360 1048 225 1065 1381 701 47 909 191