– The input sensitivity is around 2V which is ideal for a power amplifier and ideal when mating with Audio Note's M3 Line pre-amplifiers. This realization quickly spread to Europe and then the whole world with this type of amplifier being regarded as an all time classic. The result is the "Fatboy" 300B amp - named as such because, like me, it is a tad overweight. As it is the sound is quite similar to the sound 300B, suddenly it seems even better, it may be the enthusiasm of the novelty but it says a lot about the quality of this new amplifier. We made a direct comparison against the Sofia Electric SET 300B equipped with JJ 300B triode tubes. Using a separate tube rectifier (5U4-GB) for each channel results in a decreased voltage loss across the tube rectifier. The output stage is a SE 300B triode and the maximum power output is about 8 Watts per channel. The power transformer (T2) is shared between both audio channels of the SET amplifier. Created 24 March 2014. We tested both triode amplifiers against Lowther DX3 horn speakers and Spicom Planar F3 (Dipole floorstanding speaker with 25"planar driver). The speakers shown in Photograph 6 are DIY double horn enclosures with the Fostex FE207E fullrange driver. UPDATE (2010-11-15) - the English translation Fundamental Amplifier Techniques with Electron Tubes is now available. The circuit that I decided to follow for my 300B triode amplifier I found on this site, the 300B Single-Ended (SE) tube amplifier schematic with direct coupled 6SN7 input stage. Well I've made up my mind. I am really pleased with how the 300B SET amplifier build turned out both aesthetically and sonically. The MDF wooden frame and transformer covers were primed and painted with spray cans. For the audio output transformers (T1) I used Lundahl LL1623 Transformers (90mA) - PDF (52kB). V2 is 6CG7/6FQ7 for normal use. This is where cool air will enter the amplifier. Photograph 2 shows the 7805 regulators I initially tried for the 300B filament circuit. In my initial attempt I tried two 7805 voltage regulators in parallel for each channel but the current draw from the 300B heater filaments was too large for the 7805 IC. At this point, the amplifier had not yet been finished still requiring the transformer covers and ventilation holes in the top plate. I used Tango NC-14 interstage and FX40-5 output transformers, which I've had around for a while. The amplifier comes in two chassis, one for the amp itself and a separate power supply. It really is a pity you that you cannot hear for yourself how wonderful this DIY 300B SET amplifier sounds. I'd like to thank the website for providing the schematics to build such a wonderful sounding 300B triode amplifier. I have changed out the 0.22uF AuriCap (C3, Photograph 2) and settled in on new old stock Russian military paper-in-oil (PIO) capacitor k40y-9 (0.47uF, 630V) - Photograph 3. This amplifier, can be operated with every possible 300B tube available on the market. For your reference, the tube pinout diagrams for the the 6SN7 twin triode, 300B directly heated triode and 5U4GB twin diode tubes are shown in Figures 3, 4 and 5. The First Series "030" (FS-030) is specifcally designed for use in sophisticated low-to-medium power single-ended circuits. This was taken about 20 minutes after the units were powered up the first time. There are a million circuits available online but they are all designed for full range. First DIY amp FINISHED - 300B SET - works. Good audio output transformers are the key to really outrageous performance. - Gio Militano (Editor) Remember that the maximum anode voltage for the 300B triode tube is 450V. So, the set-up could be Mundorf + VCap (RIAA) and Mundorf - or - VCap in the 300B amp. Note that I did not use the Hammond transformers shown in the Figure 2 Schematic. The Canary Audio SET 300b M-80 is a mono-block amp that retail for $9,000/pair and puts out eight watts per mono block. In the end I was very pleased with how my chassis turned out for the 300B SET amplifier. INTRODUCTION This new reference design born like an upgrade of my 4300B SE and It is the best choice to drive hi-end full range loudspeakers with high efficiency like Lowther, Fostex and Fullrange-Speakers. I used a separate LT1085 regulated power supply circuit for each audio channel. The filament supply of the 300B is electronically regulated, and the plate (anode) current settings is done automatically by the amplifier. To further improve performance from this 300B triode amplifier the power supply filtering sections have been duplicated for each channel. With the LT1085 regulator circuit in place the 5V filament supply was stable and the 300B SET amplifier was whisper quiet. Sound: Please do not ask by an email description about sound, but a little but we can say. The top plate is made from a 4 mm thick aluminum plate. The hot air will rise and exhaust through the ventilation holes in the top plate (Photograph 5). This 300B Single-Ended-Triode (SET) amplifier circuit uses a direct coupled 6SN7 driver stage. The voltages noted in Figure 1 are measurements from my 300B triode amplifier build and compare closely to the voltages shown on the original SE 300B schematic. The power tranformer is a Hammond 278X (800V CT @ 230mA + 5V CT @ 3A + 6.3V CT @ 6A). 300B Amplifier Schematic. - Gio Militano (Editor). Photograph 6 below shows my first listening session with the 300B SET amplifier. this comment from Owner on 24th May 2018 Santiago,Chile he said seem like 300B SET… As a thank you for the 300B amplifier schematics, Stamou has shared with us his implementation of the 300B single-ended (SE) tube amplifier schematic by J.C. Morrison. This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. The frame is made from 20 mm thick MDF wood which was finished with spray primer and paint. With 3.5-W output power, this amplifier loves horn-based speaker systems. For improved performance an anode choke (L2) was been added to each channel. More 300B Triode Amplifiers. Recommended are the Magnequest FS-030 audio outputs by Michael S. LaFevre. I'll find a suitable chassis and some greenlee punches and go from there. I recently acquired a 300B SET amp to audition as a summer replacement for my two 845 SET amps which are space heaters. Please be sure to consider ventilation when you are planning your 300B triode amplifier build. - J.C. Morrison (1993). The schematic for the J.C. Morrison 300B Single-Ended Vacuum Tube Amplifier is shown below. The tube compliment was Electro Harmonix 300B Gold Grid, Electro Harmonix 5U4GB and Tung-Sol 6SN7GTB. Over-sized stereo chassis (20" wide by 12" deep) allows space between components, as well as, use of oversized flagship 300B output transformers that is made to our specification, it is capable of a staggering 30 watt output. Specifically recommended in the circuit notes was that premium output transformers and components be used for the 300B amplifier build. The schematic shown in Figure 1 is for one channel only with the exception of the power transformer (T2) which is shared between both amplifier channels. Please take a look at the SE 300B schematic for a description of Mr. J.C. Morrison's SE 300B tube amplifier circuit which I will refer to as the "original schematic". 300B based amplifiers offer the easiest access to and greatest choice within the SET topology. You will notice that I have drilled a number of ventilation holes in the bottom plate (Photograph 4). A pair of these power amplifiers are a perfect mate for the Mentor pre-amplifier and a path to truly exceptional audio enjoyment. The hum potentiometers protrude through the bottom plate so that you may regulate the noise from the 300B triode without having to open up the chassis enclosure. I have been using this amplifier for over 2 years now with no problems and this 300B SET amplifier continues to impress all who listen. It means, every available 300B tube can be … The tubes used most were mainly the directly heated 300B, 2A3 and 845. The bottom plate is made from a 2 mm thick aluminum plate. Hello, this is my first post, although visit these forums often. The 300B SE tested in the 300B PSE chassie. In the original SE 300B schematic a solid state filtered DC power supply is used for the 300B filaments. Warning: This 300B SET amplifier project uses voltages which are in excess of the 400 Volt range.
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