Current (new) production 300B tubes like the Electro-Harmonix 300B and the JJ 300B sound wonderful at a fraction of the Western Electric 300B price. I also use WIMA DC Link film caps as the last caps. 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. ... you set the cathode of the 300B to a high voltage (i.e. We tested both triode amplifiers against Lowther DX3 horn speakers and Spicom Planar F3 (Dipole floorstanding speaker with 25"planar driver). I find that I prefer the sound of the Russian PIO capacitors over that of the metalized polypropylene AuriCap. With 3.5-W output power, this amplifier loves horn-based speaker systems. V2 is 6CG7/6FQ7 for normal use. As music pours out of Elekit’s new amp through my speakers, I’m smiling, and remembering that some things are much more than the sum of their parts. this comment from Owner on 24th May 2018 Santiago,Chile he said seem like 300B SET… I'd like to thank the website for providing the schematics to build such a wonderful sounding 300B triode amplifier. If you use the best available parts and materials in constructing it (as well as stash away a few tubes for a rainy day), it will pass down to your children and continue to wow 'em in the next millenium. 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". Review by Noam Bronstein. © Stamou Tasos and diyAudioProjects.com -, 300B single-ended (SE) tube amplifier schematic, 300B Single-Ended (SE) tube amplifier schematic with direct coupled 6SN7 input stage, grounding and shielding for your DIY audio projects. The tube compliment was Electro Harmonix 300B Gold Grid, Electro Harmonix 5U4GB and Tung-Sol 6SN7GTB. Hello, this is my first post, although visit these forums often. the my new reference 300B Amplifier max performance to drive high efficiency loudspeakers started 16 february 2011. Now set the meter for '95' and it is calibrated. October 2nd, 2019, 12:07 am. It is not necessary to use Western Electric 300B vacuum tubes. Photos of his build are shown below and additional information is available on the forum in the First DIY amp FINISHED - 300B SET - works! While the power transformer (T2) is shared between both channels, each audio channel has separate rectifier, chokes and filter capacitors. With the LT1085 regulator circuit in place the 5V filament supply was stable and the 300B SET amplifier was whisper quiet. Specifically recommended in the circuit notes was that premium output transformers and components be used for the 300B amplifier build. If would like to see some circuit diagram Schematic diagram for 300B Single Ended Amplifier. Some time ago I’ve got a set of custom-made power transformers by JMS Transformers in the UK. Last update 28 April 2015. 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. I used Tango NC-14 interstage and FX40-5 output transformers, which I've had around for a while. A Two Chassis Single Ended Fixed Bias 300B Amplifier With Fully Regulated Supplies. Elekit does this by providing two different sockets: one that fits 300B tubes, and another that is for KT88, 6550, KT66, KT77, EL34/6CA7, or 6L6GC tubes . Good audio output transformers are the key to really outrageous performance. The First Series "030" (FS-030) is specifcally designed for use in sophisticated low-to-medium power single-ended circuits. It means, every available 300B tube can be … The finished amplifier is shown in Photograph 5. I have assisted by translating, formating and presenting his DIY 300B triode amplifier project. Please be sure to consider ventilation when you are planning your 300B triode amplifier build. Note that I did not use the Hammond transformers shown in the Figure 2 Schematic. 6SN7 / 300B Single-Ended Tube Amplifier Schematic; 6SN7 / 300B SET Amplifier Build Thread; DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier Project What were those design priorities? Unbelievably, it had been almost 20 years since I'd last heard a 300B amp in my home system. Warning: This 300B SET amplifier project uses voltages which are in excess of the 400 Volt range. The Triode then drives the output transformer - TRANS-152. Lundahl is a leading manufacturer of audio transformers and the Lundahl LL1623 transformers uses a special audio C-core. 300B Amplifier Schematic. The power tranformer is a Hammond 278X (800V CT @ 230mA + 5V CT @ 3A + 6.3V CT @ 6A). I'll find a suitable chassis and some greenlee punches and go from there. The filament supply of the 300B is electronically regulated, and the plate (anode) current settings is done automatically by the amplifier. 300B Single-Ended Triode (SET) Amplifier Schematic. This realization quickly spread to Europe and then the whole world with this type of amplifier being regarded as an all time classic. Ultralinear circuit uses an extra set of windings in the output transformers. The LD+/Mk2 now offers universal flexibility to build with multiple drivers and output tubes. The power transformer (T2) has many taps specified as 400-0-400 @ 250mA, 6.3V @ 2A, 6.3V @ 2A, 6.3V @ 2A, 5V @ 3A, 5V @ 3A. Elekit TU8600 Amplifier Kit. The 300B SET amplifier was built using point-to-point construction. Re: 300B Amplifier Schematic October 5th, 2019, 12:11 pm To follow up later in the morning, just remembering you are using the 300B amp in a midbass horn (100-500 Hz), I believe I had slightly better results using a PP2A3 amp than a set amp on my setup. 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. There are a million circuits available online but they are all designed for full range. This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. I did not deviate all that much from the original SE 300B schematic that I was following. The output stage is a SE 300B triode and the maximum power output is about 8 Watts per channel. Back to DIY Audio Projects Back to DIY and HiFi Audio Schematics, DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier project, Power Supply Design for Vacuum Tube Amplifiers. Photograph 6 below shows my first listening session with the 300B SET amplifier. In an email exchange with Gio he recommended that I try the LT1085 voltage regulator circuit shown in Figure 2 for the 300B filaments. The speakers shown in Photograph 6 are DIY double horn enclosures with the Fostex FE207E fullrange driver. There is more information about power supply design with tube rectifiers in the Power Supply Design for Vacuum Tube Amplifiers article. A 300B “statement” amplifier for Real Serious 300B Fanatics (that’s a technical term!). R7 was adjusted from the original value of 27k to 15k to attain the target voltages. The other power supplies include the fixed bias ones: 300B SE Amplifier: Fixed Bias Supplies. Guys, I want to build a 300B Amplifier. For the audio output transformers (T1) I used Lundahl LL1623 Transformers (90mA) - PDF (52kB). More 300B Triode Amplifiers. Nov 4, 2016 - Stamou Tasos outlines the design and construction of a 300B single-ended triode (SET) tube amplifier following a single-ended (SE) tube amplifier schematic by J.C. Morrison. I have assisted by translating, formating and presenting his DIY 300B triode amplifier project. Stephen (sampleaccurate on the forum) put together a 300B SET amplifier following the above direct-coupled 6SN7 driver / 300B SE amplifier schematic. So when you build it nicely, and also use the hints that are in the schematics, this amplifier has almost inaudible noise or hum. Extended highs. I was anxious to hear how a $1785 amp kit would … Recommended are the Magnequest FS-030 audio outputs by Michael S. LaFevre. This gives the smoothness of SET amps with the power and dynamics of push/pull design. - Gio Militano (Editor). The frame is made from 20 mm thick MDF wood which was finished with spray primer and paint. Additional photos and information is available on the forum in the First DIY amp FINISHED - 300B SET - works! The driver stage is low noise schematic, and the heaters are all with DC. The output stage is a SE 300B triode and the maximum power output is about 8 Watts per channel. The tubes used most were mainly the directly heated 300B, 2A3 and 845. The power transformer (T2) is shared between both audio channels of the SET 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. Both of my 845 amps have wonderful tonal balance, articulate … Remember that the maximum anode voltage for the 300B triode tube is 450V. I recently acquired a 300B SET amp to audition as a summer replacement for my two 845 SET amps which are space heaters. In my experience, a high quality audio output transformer is required for superior performance with SE tube amplifier circuits. I can now honestly say that I prefer vacuum tube amps (although I like tinkering with all types of audio gear). You will notice that I have drilled a number of ventilation holes in the bottom plate (Photograph 4). This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. After building a 2A3 single-ended (SE) amplifier and retrofitting a set of 300Bs in place so I could compare the two types of output tubes, I was amazed at what a SE directly-heated triode (HT) amplifier could sound like. For those within the SET brigade there are deep individual preferences for different tubes: 45, 2A3, 300B, PX25, 211, 845 and so on. The amplifier reveals a magnificent sound stage with warm sound and pleasant harmonics. Stamou has built this amplifier with Lundahl LL1623 audio output transformers. A pair of reasonably sensitive (>91 dB/1W/1m) loudspeakers will be required with this 300B SET amplifier. The LT1085 regulated power supply circuit is connected to the 6.3V taps from the power transformer (T2). This 300B Single-Ended-Triode (SET) amplifier circuit uses a direct coupled 6SN7 driver stage. 178 nF used for C3. To further improve performance from this 300B triode amplifier the power supply filtering sections have been duplicated for each channel. 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. It is honest and accurate and sweet and will drive a surprising number of commercial speakers to acceptable levels. Created 24 March 2014. So, the set-up could be Mundorf + VCap (RIAA) and Mundorf - or - VCap in the 300B amp. The chassis for the 300B triode amplifier was built by myself. This was taken about 20 minutes after the units were powered up the first time. We made a direct comparison against the Sofia Electric SET 300B equipped with JJ 300B triode tubes. The power transformer and chokes are from a local manufacturer here in Greece and built to custom specification. Inside is above ,good construction.!!! One on the power supply PCB (C11) and one in the amplifier board (C1) which is a massive 80μF/900V one. Dec 28, 2016 - This page contain electronic circuits about Electronic Vacuum Tube or valve Circuits Circuits and schematics. I haven't built any of those since a while, here is a new version of a single ended stereo amplifier which can use either a 45 or 2A3. thread. The hot air will rise and exhaust through the ventilation holes in the top plate (Photograph 5). For the internal input cable wiring I used Mogami W2330 shielded interconnect wire. Design Elements The Legend Monoblock 300B-2A3 Parallel Amplifier is a true high-end amplifier, a beautiful By reducing the size of R8 you can increase the B+, but note that the maximum anode voltage for the 300B triode tube is 450V. The transformers and choke are all from Hammond. This 5V regulated power supply for the 300B filaments was posted by Suncalc and details about the regulated circuit are in the 300B SET Design Project forum thread. In the original SE 300B schematic a solid state filtered DC power supply is used for the 300B filaments. - Gio Militano (Editor) thread. You should expect that the values of R7 and R8 will need to be adjusted slightly in order to achieve the target voltages shown in the schematic. At this point, the amplifier had not yet been finished still requiring the transformer covers and ventilation holes in the top plate.
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