Reply. Item #649511080. I replaced all tubes and that did not fix the problem. Stefano Bianchini. The DIY kits components version is the components need the buyer to install himself. 64K subscribers. Sorry for the late reply! Yeah, mine had: *Increased the power stage bias from 40% of max to 80% *Redesigned the input tube topography - changed from parallel triode to Cascode. Looking at the 'Plate characteristics' graphs (Current vs voltage for different grid bias voltages), the working currents seem to be in different parts of the graph. com Boyuu A9 EL34 튜브 증폭기 Reisong 완료 단일 종단 통합 6SN7 램프 - This is kit and need you solder it by yourself, it's very suitable for love DIY hifi friends. 1; 2; First Prev 2 of 2 Go to page. I hope the drop will be less than 10%. Boyuu A20 KT88 Tube Amplifier $ 689. This site uses cookies to improve your experience and to help show content that is more relevant to your interests. Have a look at the A10 schematic that LongRoad posted recently. The sound is very sweet mids with soft bass but musical. 6W (8Ω)周波数特性:38Hz—36KHz (±2dB)寸法:220 (W) x 136 (H) x 188 Feb 1, 2015 · With regards to your valid concerns over the A9's power dissipation, once I increase the biasing, I only want to increase it enough for the bigger 15w/6. It shows 3 attachments to 'chassis ground':-the 'green wire' from the AC IEC jack-the transformer- grounded via the bolt if the paint is penetrated-the place where the circuit ground (at the heater 'artificial center tap- 100R resistors) connects to the chassis via a resistor and cap in parallel. A simple class AB push-pull amp with two 6F2 tubes and four 6P1 tubes. The B+ minus the self bias voltage will be too much for the 6B4G, so you will have to find a good way to reduce the B+ voltage. com FREE DELIVERY possible on eligible purchases Feb 1, 2015 · With the Boyuu A9 which has two switched inputs (NavyDiver showed this in his pics/videos), it would be easy to have one 'Hi' and one 'Lo' level input if desired. Suggestions: Make Feb 1, 2015 · In any case, on my Boyuu A9 it is the tube that has the biggest voltage drop that gives the best sound quality the 5R4WGB JAN (Cetron). Shipped with USPS Priority Mail. com FREE DELIVERY possible on eligible purchases Feb 1, 2015 · Now that's just what I wanted to hear to get the build started. 6 (which is close to the EL34 Feb 1, 2015 · Hey guys, Early on, I ordered a 470uF/450V beast of a cap for C302 and two 33uF/450V for C301 and C303. UPDATE: On this build, one of the kit's Feb 1, 2015 · 100K Ohms logarithmic Jun 25, 2021 · There are more than one thread on the Boyuu A9 amplifier. This is a low powered Single Ended Triode (SET) Tube Amplifier. Dec 5, 2018 · Buy Reisong A10 EL34 Hi-Fi Audio Stereo Tube Amplifier Single-end Class - A Amp: Amplifiers - Amazon. I am most familiar with the Heresy 1 as I used to sell the full klipsch lineup in the military PX system overseas from 1982 - 1984. 5V peak Output (pin 3): 370V peak to peak = 185V peak So EL34 gain is 10. Feb 1, 2015 · Navydiver said: Is the '0' speaker terminal connected to the circuit ground? (not chassis). I found the diyaudio forum, became a Feb 1, 2021 · I knew I couldn't expect much out of it, but after watching a favorable online review of the Reisong A10 amp and reading a few others, I bit the bullet and found one available with two desired options: 1) no tubes, and 2) point-to-point wired. the bass is better for sure. 1 Feb 1, 2015 · I don't understand. HiFi-Amplifier Audiophile online store REISONG Boyuu A9 EL34 싱글 엔디드 퓨어 클래스 A 진공관 앰프 DIY 키트 [Boyuu A9] - REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier Brand new & 100% original factory Specifications:Output Power: 12W * 2 (ultra-linear connection)Frequency Response: 20Hz - 28KHzOutput impedance: 4,8ΩTotal Harmonic Distortion: ≤ 1% (1kHz HiFi-Amplifier Audiophile online store REISONG Boyuu A9 EL34 Single-Ended Pure Class A Röhrenverstärker Bausatz [Boyuu A9] - REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier Brand new & 100% original factory Specifications:Output Power: 12W * 2 (ultra-linear connection)Frequency Response: 20Hz - 28KHzOutput impedance: 4,8ΩTotal Harmonic Distortion: ≤ 1% (1kHz)Input Feb 1, 2015 · Boyuu EL34 A9 Tube Amp. Feb 27, 2018 · DIY Boyuu A9 Build - Absolute beginner! . Feb 1, 2015 · I just did a test with my little FX Audio plug-in preamp equipped with EF95 and the result is surprising in a good way. This was before I noticed the shorting OPTs and began taking it apart again. And bandwidth The Boyuu A9 is offered in a version with bigger OPTs already installed but I haven't any specs for those but I'm guessing 12w more or less. 6W, so yes, they should be hot, but it shouldn't cause any problem if they're real 2W ones Dec 6, 2018 · Buy Reisong - BOYUURANGE A20 Hi-Fi Intergrated Amplifier KT88 Tube Single-end CLASS A 4ND VU Meter: Amplifiers - Amazon. 99 +$99. My thinking is that the cheap tubes that ship with HiFi-Amplifier Audiophile online store : Boyuu Audio Reisong 하이파이 진공관 앰프 - LINLAI Psvane Electronic tube valve,Line Magnetic, MUZISHARE Power Amplifier & tube Amplifier,Cayin tube Amplifier,Shanling CD player,ToneWinner HDCD Player,Oldchen tube Amplifiers,Audiophile Amplifier from China,Choseal HiFi Cables. Feb 1, 2015 · House was built in 1967 - 115. I did replace all tubes with a German made 5U4G and replaced the EL34B with a TungSol. Will try the bypass capacitor this weekend. 3v x2A +5v x4A=217. Both reviews are positive and can be seen on youtube. Yes. 11K views 4 years ago. By Boyuu A9 EL34 Tube Amplifier Reisong Finished Single-Ended Integraed 6SN7 lamp In Stock: 10 Model: Boyuu A9 Price: $228. Feb 1, 2015 · I got my VU meter kit for free from Nobsound because they screwed up the delivery of my A9 amp causing delays, but this kit can be bought on eBay. Feb 1, 2015 · 200k bleeders will run at about 0. It Feb 1, 2015 · Hi Gidu, I still don't know why, but I implemented your mods (100R to ground on heating and a 3k res at input) and they appear to work. We Sell HiFi tube Amplifiers,Power amp, Preamp, CD player. 1 Feb 1, 2015 · BOYUU A9 Valve amplifier help/suggestions Hi All I am new to this site. I connected the speaker 0 output terminals together and took the common together with the schematic (pcb) 0V and screwed them to the chassis along with the earth wire from the mains inlet. I am terrible in describing personal listening experience in words. Quick View. I am an electronics engineer and radio amateur trying my hand at building a valve amp. 25A +6. I suspect the 220 uF cap is now kaput so I'll order a replacement and see how it goes. Just some history! Feb 1, 2015 · Then I bought a pre-built Boyuu A9 EL34 from a stock in Germany. The A10 looks to be a little more point to point wired than the A9 but they are very similar and will sound alike. Dec 3, 2021 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Subscribed. (The current through the resistors is: I = 6. Info: Boyuu A9 Integrated Tube Amp. Please take the time to read if you want. Oct 23, 2020 · I think its common to find tall transformer covers to give an even aesthetic, hence my question to OP REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier DIY Kit : China-hifi-Audio online store, Yaqin,Meixing Mingda,XiangSheng,Line Magnetic Tube Amplifier, power amp, preamp,hi-fi CD Player high end audio for sale [MUIA9831299] - $199 Feb 9, 2020 · So I did a lot of internet research on the Boyuu tube amps this weekend and finally ended up not with the Reisong A10 but with his brother, the Boyuu EL34 A9 Tube Amp, that I found for about 350 bucks on Ebay. I love the smooth sound of my A9 , great for vinyl As to the 12AX7 conversion. 1 About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Feb 9, 2020 · I bought a Reisong Boyuu A9 about three years ago. Feb 1, 2015 · Boyuu A9 better rez stock schematic rotated . I try to use the boyuu a9 with my Heco Celan 300 on 4 Ohm. Argued with him for 2 months and finally gave up. I have just bought a BOYUU A9 amplifier and have drawn some proposed modifications on the schematics (please see the attached changed May 15, 2018 · シングルエンド真空管アンプ BOYUU A2【仕様】真空管:12AX7×1, 6P14/EL84×2定格出力:3. 1 * tube amplifier * BOYUU A9 EL34 a class amplifier tube amplifier assembly Kid used Yahoo Auctions Auction bid ¥9,834 Aug 22, 2019 - Aug 29, 2019 Kleinanzeigen Feb 1, 2015 · Search titles only By: Search Advanced search… May 6, 2019 · SOLD - FOR SALE: Boyuu A9 Integrated Tube Amp . Immerse yourself in crystal clear, high-fidelity sound. 5 V right now, though sometimes it changes at different times of day. com Boyuu A9 EL34 Röhrenverstärker Reisong fertige Single-Ended integrierte 6SN7-Lampe - This is kit and need you solder it by yourself, it's very suitable for love DIY hifi friends. When Reisong started badging them, they became the A9, but in a cheaper steel chassis. zosilnovač pekne hraje . I have a background in engineering documentation (20 years integrated circuit design in Silicon Valley) so how I made sense of the A9 was to draw everything out Boyuu MT-88 KT88 Push-Pull Tubes Amplifier With PSVANE power tube option , the amp come with psvane hifi seire kt88 tube and all other tubesWith Shuguang power tube option , the amp come with Shuguang KT88-98 tube and all other tubesWithout any tube opetion , the amp come without any tube REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier Brand new & 100% original factory Specifications: Output Power: 12W * 2 (ultra-linear connection) Frequency Response: 20Hz - 28KHz Output impedance: 4,8Ω Total Harmonic Distortion: ≤ 1% (1kHz) Input Sensitivity: 750MV Input impedance: 100KΩ (two input signals) Dimensions (W × D Feb 1, 2015 · The A9 amp comes with 200 watt transformer (640v x0. Aug 13, 2020 · Reisong and SA are both rebadges). The Lepai LP-2020A+ sounds way better. com Boyuu A9 EL34 Tube Amplifier Reisong Finished Single-Ended Integraed 6SN7 lamp - This is kit and need you solder it by yourself, it's very suitable for love DIY hifi friends. The KIT's price is included the KIT and a circuit Oct 23, 2020 · Boyuu A9 - just purchased the kit !! Thread starter chriskim; Start date 2020-10-23 11:17 pm; Prev. Boyuu A9 BYA9 EL34 Tube Amp Single-Ended Integraed Tube Amplifier. I have owned this for 18 months now, having bought fully assembled. And the loss of power is absolutely insignificant! As far as the power tube, among those I tried, (EL34 Shuguang, EL34 EH, 6CA7 EH and KT77 JJ), it is the KT77 JJ which gave the best results on all levels Boyuu A9 BYA9 EL34 Tube Amp $ 458. 3 Volts on the 6N9PJ and 150 mA under 12 Volts on the 6N2PJ which makes a difference of 300 mA for both 6N2J tubes compared to 6N9PJ, which may explain the respective Feb 1, 2015 · I ordered a more powerful transformer than it costs in model A9. It will not play as loud as my cell phone. Boyuu MT-34 HIFI Tube Amp EL34 Push-Pull Tube Amplifier Lamp amp 110v-240v 100% original factory and brand new Basic technical parameters: Input Sensitivity: 550mV Output power: 2 times 35 watt (Ultra-linear connection mode) 2 x 15w (Triode connection mode, can be switched) SNR: 88dB Input impedance: 100KOmega Output Impedance: 4 ohm, 8 ohm Input voltage: 220v-240v 50/60Hz Power consumption Feb 1, 2015 · Pictures of point-to-point wirings WOULD be very useful Hi All, The lack of documentation with the Boyuu A9 was disconcerting at first but soon enough things started to make sense. *Added artificial center tap to heater circuits, elevated to approx 50v via added potential divider. Boyuu A9 BYA9 EL34 Tube Amp,BOYUU,Brands. I was a bit daunted by the lack of a set of instructions but after having read and re-read this thread and other conversations I'd just like to raise a vote of thanks to all who have gone before. There are two different pairs of solder points for the B1 connections-one pair close together at the end of that C302 trace on the top side of the board, the others are at the edge of the board; use either, IMO. pdf) or view presentation slides online. I wanted to give tubes a try and this seemed like a good starting point. There are very few photos of the internal wiring of the A9 availalbe. I have corrected it but now when I switch on I get a loud, very loud, mains hum and no signal. Feb 1, 2015 · In the Boyuu, it seems that each triode in the 6N9P is running at about 0. 1 watt, so 0. Feb 1, 2015 · Search titles only By: Search Advanced search… Geänderter Ruhestrom für KT88 auf 72mA mit (200 Ohm) Widerstand. This amp is Primeamp. The components are for the standard version. Note the brown earth from the input board - I think that may be incorrect for starters but let me know if anything obvious stands out. Mar 12, 2018 · Hi there. Very briefly during warm up a little hum, but gone after a minute. With the original chinese preamp tubes hum is accetable. I have a choice of Heresy 1 or 2 or KG4 speakers - he is a Klipsch collector. My problem now is that I have no sound. Squiggles70 • 1 yr. Feb 10, 2020 · The A9 comes with 6N9PJ but I managed to find a pair of 6N9p to 6n2p tube converters on ebay. Along with the Mar 13, 2022 · Hi, I'm Robert from Germany. I do not know why yet, but I will try to understand. I've replaced the chinese tubes with Svetlana 6p1p-ev tubes and Polam ECF8 Dec 1, 2019 · Reisong A10 Amazon Link China HIFI Audio Link I recently purchased a Reisong A10 amp from Amazon. Hi All, I have been reading avidly on this forum about your experiences and issues building this amp. I modified the tube heater circuit with a couple of resistors and a capacitor and got the hum to acceptable levels. Feb 1, 2015 · Voltage test: With the transformer unloaded, the two 6. 2. Am considering buying a pair of uber-efficient Klipsch speakers for my Boyuu A9 from a fellow I know. So my experience of building the Douk Boyuu A9 kit has gone from bad to worse (all down to my own mistakes/learning). Output impedance: 4,8Ω. You can imagine how more sensitive it is than your amp, capable of picking up hums and noises! The author very carefully drew how ground wires have to be connected If you follow it exactly, there will be no hum. Those who already know this will not need HiFi-Amplifier Audiophile online store REISONG Boyuu A9 EL34 Однотактный ламповый усилитель Pure Class A DIY Kit [Boyuu A9] - REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier Brand new & 100% original factory Specifications:Output Power: 12W * 2 (ultra-linear connection)Frequency Response: 20Hz - 28KHzOutput impedance: 4,8ΩTotal Harmonic Distortion Mar 1, 2020 · Recently Steve Guttenberg have reviewed the Boyuu Reisong A10 tube integrated right after Zero fidelity review. It is a NOS tube still very easy to find and inexpensive and its lifespan is exeptional (more May 23, 2020 · I bought the Boyuu A9 el34 tube amp from China. So, i thought i should give it a try this Chinese 'gems' and pair it with my Klipsch RP600s especially that I've never owned a tube amp before. The KIT's price is included the KIT and a circuit In this video, I'm sharing my latest project – the Boyuu Hi Fi valve tube amplifier kit 12W per channel EL34 power tubes with quality components. Jan 23, 2019 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Primeamp. Feb 1, 2015 · Yes, you have that worked out correctly. I'm relatively new to tube ampflifiers. I disconnected the input stage and made a temporary connection diect to grid of input valve, but still got the same low output. What I felt was that when I listened to the same album of Dianna Krall's , I could Boyuurange A9 12-Watt EL34 Class A Stereo Amplifier Kit. This is point-to-point wired with 'Japanese' uprated power and output transformers. China-hifi-audios. Out of curiosity I bought a diy kit on eBay a few months ago. 3 kilo ohm on 6N9PJ tubes have any effect on the tone? I have not done this yet Greg Feb 1, 2015 · Search titles only By: Search Advanced search… China-hifi-audios. 5w or more would be OK. 99USD Weight: 13Kg Manufacturer: Reisong Boyuu: This is kit and need you solder it by yourself, it's very suitable for love DIY hifi friends. 109. Please excuse shaky footage!Props to the DIY Audio Forum members w About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Jul 29, 2013 · Re: problém zo zosilňovačom Boyuu A9 Príspevok od používateľa Andrej152 » 07 Apr 2015, 17:28 ok . I'd still like to see some scope waveform info to see where the clipping/distortion is originating, but the Boyuu is a bit expensive for me to buy as an experiment. 300b, 6sl7, alimentazione, altoparlante, audio Feb 1, 2015 · Here are some pics. Specifications: Output Power: 12W * 2 (ultra-linear connection) Frequency Response: 20Hz - 28KHz. SRPP, parallel triode input, Ultra Linear, Pentode, Negative Feedback, no Negative Feedback, Triode wired output, etc. Condition is New, out of box and working. 3 / 100 = 0. 8 watt). And the frequency response test in the post before it was done well too. Oct 30, 2020 · Boyuu A9 – Single Ended EL34 + 6N9p DIY KIT – Total Upgrade . Had to use the Chinese Feb 1, 2015 · looking for100k 3w mini resistors. Thread starter sundaycyclist; Start date 2015-02-01 12:53 pm; Prev. Let's Build this thing! DeadKoby. The grounds ultimately go into the PCB common circuit ground. You must be good at DIY tube amp. I'll get a larger capacity/better Feb 1, 2015 · Not to get off topic, you are certainly right. you will find divider calculators on the internet, it's simple to use, you just need to know your input voltage and what you want output, example: input voltage 2v Schematic for BOYUU A9 SEP EL34 amplifier. 00. The sound stage, the stereo sound separation is considerably improved, everything seems cleaner and less artificial. Stay Connected Feb 1, 2015 · When I use the pontiometer to control the volume I can control the volume of the humming noise. I have Feb 1, 2015 · Hi OldHector, How about the old simple rule of turning off the amplifier before messing with the speaker leads??? That's how I do when I switch the speakers, but my kids will also use the system so I want to add the safety 8ohm load resistors in case they forget to turn off the tube amp when Feb 1, 2015 · Just curious, but do you ever use the switch, or just put it into triode mode and leave it there? I may just save myself some drilling ;-) I mostly leave it on UL. Why especially this amp? Because it came as a kit, case included, in my opinion looked fairly good, would be delivered within 2 days and the price was right. Asking Price: CAD $ 500. 65 mA (assuming the current is divided equally between the two halves of the tube). Interestingly, these amps were available as DIY kits about 10 years ago in these very same chassis. I'm used to building electronic kits with good plans but the Boyuu comes with a schematic wiring diagram only which I'm finding difficult to interpret. 216. I put 2x470uF for C302 and it was all right. I think he may have sent me a 220 volt instead of 110 volt. Boyuu MT-88 KT88 Push-Pull Tube Amplifier $ 685. Join me exploring this exciting hobby! This channel focuses on designing, building and testing various Feb 1, 2015 · If I'm plotting a loadline on a blank datasheet for a cathode-biased, reactive load, such as my power stage, what V do I use? Is it V=HT, B+, etc ? or Feb 1, 2015 · Hello Alchemist11 - firstly thanks for sharing your Boyuu A9 kit building experience there are many who will be helped by this to take the plunge So, I "cheated" and bought a pre-assembled unit and asked for the circuit diagram (which I posted in this thread earlier) and which is labelled as A10, which uses 6N2P-EV used for first stage amplification rather than 6N9PJ so is not the same but Feb 27, 2018 · #1. Boyuu NS-11D A9 Original Schematic - Free download as PDF File (. I remember the databook but I threw away my copy many years ago. And if memory serves me correctly, over the years even the factory build may have had different circuit versions. Yes mine runs with the 30R, but I have some hum. Speaker terminal, not input jack. High gain sound is multiple gain stages stacked with tone controls inbetween, typically bass and treble cut, so the result signal is more like a squarewave than a sine, very compressed - and all that before the power stage. Go. Please forgive my bad soldering. 6W+3. On late '90, a CD-ROM was published with Philips semiconductor databooks but I should check if there were any of these passive components. The KIT's price is included the KIT and a circuit China-hifi-audios. Good advice! Usually I use 50-100k bleeder, and yes, I check with a meter also. 100% Oct 2, 2017 · Boyuu A10 EL34B. Feb 1, 2015 · Search titles only By: Search Advanced search… Sep 18, 2020 · I bought this nice china made amp It sounds nice and has some power, I believe this is the make and mode / info REISONG Boyuu A9 EL34 single-ended pure class A tube amplifier EL34Bx2 6N9Px2 5Z3PJx1 D version I’d like to know what tubes a can roll in it, does it self bias or do I have to do Feb 1, 2015 · Hello ! The Boyuu A09 amp and the A10 do not use the same input tubes: they are 6N9PJ (Octal) on the A09 and 6N2J (Noval) on the A10 ! And the intensity of the heating circuit is not the same on these two tubes: 300 mA under 6. 3 KB · Views: 531 Last edited: 2019-03-11 5:01 pm Jul 29, 2018 · Hello to all, In November 2017 I searched the internet to find information about the Boyuu A9 amp. I used the choke mounting point next to the circuit board as an anchor. . the 6N9P Pins 7,8 are the heaters and pin 2 is main power. 30 Ottobre 2020 12 Marzo 2021. chriskim Boyuu MT-34 HIFI Tube Amp EL34 Push-Pull Tube Amplifier Lamp amp 110v-240v Basic technical parameters: Input Sensitivity: 550mV Output power: 2 times 35 watt (Ultra-linear connection mode) 2 x 15w (Triode connection mode, can be switched) SNR: 88dB Input impedance: 100KOmega Output Impedance: 4 ohm, 8 ohm Input voltage: 220v-240v 50/60Hz Power consumption: 230W Frequency response: 30Hz-45KHz Jan 13, 2021 · Buy BOYUURANGE Reisong A12 EL34 12AX7 (ECC83) Hi-Fi Audio Stereo Single-end Class - A Tube Amplifier Amp: Amplifiers - Amazon. After checking the Feb 1, 2015 · Not a kit! Nobody who is old enough to have assembled a Heathkit with its almost perfect instruction book would call the Boyuu and similar amps a 'kit'. Dec 19, 2018 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright item 4 REISONG Boyuu A9 hifi tube amplifier EL34 single-ended class A EL34B 6N9P 5Z3PJ REISONG Boyuu A9 hifi tube amplifier EL34 single-ended class A EL34B 6N9P 5Z3PJ $299. The KIT's price is included the KIT and a circuit Feb 1, 2015 · I bought (maybe foolishly) a Boyuu EL34 A9 amplifier as a kit. or: that instead of connecting the chassis ground via the resistor/cap at the heater China-hifi-audios. It’s very safe to run it for prolonged time. If you are an entry-level DIYer, please don't buy Boyuu MT-88 KT88 Push-Pull Tubes Amplifier With PSVANE power tube option , the amp come with psvane hifi seire kt88 tube and all other tubesWith Shuguang power tube option , the amp come with Shuguang KT88-98 tube and all other tubesWithout any tube opetion , the amp come without any tube Sep 23, 2017 · Elevate your audio experience with our top-of-the-line EL34 Tube AMP from HIFI EXQUIS. I spent some time listening Feb 1, 2015 · But the Boyuu kit has B+ that is much higher than 325V across the EL34, even if you subtract the self bias voltage from the B+ voltage. First thing I do, was open the tube amp, and check all connections and the value of all components. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Feb 1, 2015 · That is a pretty good test of the visual distortion. It's a box of parts and a PCB, and you need some skill and experience to put it together and get it working properly without issues Feb 1, 2015 · Got another quick question. Hot Sale Sparkpen Capacitor Discharge Pen +LED Light & Sound Feb 1, 2015 · Hi wishmasterX I have the Boyuu A10 EL34 SE amplifier. Feb 1, 2015 · The resistors can be replaced by a wound potentiometer 100 Ohms / 3 Watts , allowing fine-tune balancing of 6. 3 Volts. But, when it's late in the evening I sometimes throw it into triode mode, which about halves the power and sounds nicer during Boyuu A20 KT88 Tube Amplifier HIFI KT-88 Amplifier Single-ended 6550 Lamp Integred Amp With all tubes option : is with 2 x KT88 power tube and 2x preamp tube and a rectifier tube Without any tube option : is the version wihtout any tube Feb 1, 2015 · Hi Bobbie, the feedback resistor will have about 150v voltage drop on it, it only consumes about 0. 3V heaters. DIY Boyuu A9 Build - Absolute beginner! Thread starter NickHinde; Start date 2018-02-27 4:51 pm; Status This old topic is Boyuu A9 EL34 Tube Amplifier HIFI EXQUIS Reisong Finished Single-Ended Integraed 6SN7 lamp Assembled amp I'm a designer and builder of custom tube audio gear. com FREE DELIVERY possible on eligible purchases Feb 1, 2015 · You found changing cap 102 and 202 gave you improvements? Can you further explain the voltage divider calculator. 120 KB · Views: 848 Hello this is the diagram of the A9, (6n9 preamp) , the a10 has the 6n2 preamp and has hybrid rectification. chyba - zemna slučka na vstupe Feb 27, 2018 · All, Hope you don't mind me jumping in here, but I have just acquired a Boyuu A9 too. I decided to order one and it came yesterday. Feb 1, 2015 · Please see the modified diagram for my A9, the wave form pictures and the voltage table (White cells=measured, yellow cells=calculated), and please double check my calculations below: New EL34 measurements: Input (pin 5): 35V peak to peak = 17. I forget the original brand name. As you will see by the measurements below, this amplifier Feb 1, 2015 · Hi, I just thought I would pop in and answer a question about the use of carbon composition resistors. When I try to play some music, the music sounds really bad when I raise the volume. Here is the schematic diagram of a RIAA preamp. No problems. I've taken a series of very high-res pics which I've put here: Index of /valves You can see a lot of detail in here. Are you saying that a direct connection to the chassis (not using the resistor and cap 'isolation' idea) is better, that the C302 filter cap should be connected to the chassis directly. I switch on and off the amp 2-3 times a day and played 2-5 hours every day in the past year. Feb 1, 2015 · Boyuu EL34 A9 Tube Amp. It would be easy to modify, but I have not had time or requirement to do so yet. make sure on the EL34 you join pins 1,8 together. Watch Report This Ad. Need a pair of these converters Feb 1, 2015 · I believe that the data about those vintage capacitors has been published on paper only. After replacing the Power transformer, I now have all 5 valves glowing nicely through the 6. I don't get it. Feb 1, 2015 · Too low of a bleeder resistance discharges faster, but wastes power, and adds up heat in the amp enclosure. The amp turned dead quiet, unless there is music, no hum or buzz. After I replaced the preamp tube with NOS 6SL7GT (Russian Military) I had incredible Feb 1, 2015 · EL34 Pins 2,7 are for heaters, 3 is connected to opt, 4 is connected to B+ are main power. Chassis : Professional design, the surface does not have a screw. 7 VAC at the socket - that may answer the delta:confused: That's similar to the voltage at my place - 116. Insetting the tubes and slowly get power on with my vario-transformer (Nordmende RT 397/1). 3. It had too much hum in stock condition for my vintage 100 dB sensitivity Electro-Voice speakers. Scribd is the world's largest social reading and publishing site. They show the performance of that single ended circuit, and that output transformer. 3V secondaries will have the same voltage, or nearly the same voltage. I hear a little hum in the right speaker and a little more hum on the left. If you are an entry-level DIYer, please don't buy the KIT. Features: Power transformer : using imported 0. 99 shipping Boyuu MT-34 HIFI Tube Amp EL34 Push-Pull Tube Amplifier Lamp amp 110v-240v 100% original factory and brand new Basic technical parameters: Input Sensitivity: 550mV Output power: 2 times 35 watt (Ultra-linear connection mode) 2 x 15w (Triode connection mode, can be switched) SNR: 88dB Input impedance: 100KOmega Output Impedance: 4 ohm, 8 ohm Input voltage: 220v-240v 50/60Hz Power consumption Jan 4, 2021 · HiFi-Amplifier Audiophile online store REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier Brand new [Boyuu A9] - REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier Brand new & 100% original factory Specifications:Output Power: 12W * 2 (ultra-linear connection)Frequency Response: 20Hz - 28KHzOutput impedance: 4,8ΩTotal Harmonic Distortion: ≤ 1% (1kHz)Input Sensitivity Feb 1, 2015 · Boyuu EL34 A9 Tube Amp. Carbon composition resistors are not inductive, and therefore find use in high frequency circuits. Ohmmeter test: The DCR of the high current secondary will be lower than the 1 Amp secondary. ago. Payment method Feb 1, 2015 · Hi again. 6Z OPTs I'm going to order. Feb 1, 2015 · LongRoad Thank you for the response. 396 Watts or P = 6,3 x 6,3 / 100 = 0,396 Watts) PS : Warning to the mount of the new 300 microfarads capacitor : its diameter is 30 mm , so mounting is not possible Feb 1, 2015 · Search titles only By: Search Advanced search… Feb 1, 2015 · Define normally. It sounded pretty good. Big shout out to the DIY Audio Forum family Feb 1, 2015 · I don't have the A9 schematic handy. Jump to Latest C. Also contacted Douk for all the instructional info and I got a (latest) schematic and wiring pics for the OPT and the main power trans. 35 core, pretty neat, several complex vacuum impregnation. The particular amplifier Feb 1, 2015 · Back to the grounding issues. So you can't attribute the higher than expected voltages on the (unloaded) heaters to high Feb 1, 2015 · Boyuu A9 el34 tube amp, hum even without tubes! Shared album - gert Bluemink, Gert Bluemink - Google PhotosHello all, i have read the whole topic but i see no sulutions for this: I built the Boyuu A9 and it all works fine. 2PC Panel VU Meter Amplifier DB Level LED Header Display & Driver Board Module 142372810396 | eBay It does take a lot metal work skills to install these VU meters because you have a make a very clean Apr 13, 2019 · Hi folks This is part 1 of my build, hopefully any potential builders will find it helpful. The KIT's price is included the KIT and a circuit diagram only. I'll let the tubes burn in further. 3v x4A+6. REISONG Boyuu A9 EL34 Single-ended Pure Class A tube amplifier Brand new & 100% original factory. The series resistor for the grid connection is to stop (grid stopper) high frequency Primeamp. I've had it for about 10 days and just commenced building. The Feb 1, 2015 · Thanks crismont43 it was the capacitor causing the fireworks in the rectifier. jpg. You need a low range Ohm Ohmmeter to test this (and very good connections Oct 18, 2022 · REISONG Boyuu A9 hifi tube amplifier EL34 single-ended class A EL34B 6N9P 5Z3PJ. I have got an external DAC/headphone amp from Firestone Audio which sounds nice (so far) and am hoping for some good things to come. Feb 1, 2015 · Search titles only By: Search Advanced search… Feb 1, 2015 · On my Boyuu A9, I replaced the rectifier valve 5Z2PJ with a JAN-5R4WGB. Does adding a grid resistor of 3. 063 mA , so the power dissipated is: P = 0,063 x 63 = 0. Feb 1, 2015 · Close up Here's A close-up of my build and how it's comparing to my previously posted design. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Feb 1, 2015 · Boyuu EL34 A9 Tube Amp. No problems so far but. Any help or a point in the right Nov 18, 2021 · This is a possibly biased, purely subjective review of the popular Boyuurange / Reisong A10 - A12 , a EL34 SEUL tube amplifier. The humming comes without any source. I also have one of these 'Sparkpen'; it works. Notice how i implemented the voltage/potential divider by using a 5 lug terminal tag strip board and securing it with one of Feb 1, 2015 · Search titles only By: Search Advanced search… This is a kit I bought on Ebay and built with some simple modifications. com BOYUU A9 Vacuum Tube Amplifier EL34 5Z3P Rectifying 6N9PJ Parallel Amplifier Class A Single-Ended Valve Amp Finished /DIY Kits - This is kit and need you solder it by yourself, it's very suitable for love DIY hifi friends. Yes via the coax wire that goes to the volume switch and then to the 6N9P octal sockets. These are about as small as 3W types will get Feb 1, 2015 · a9 Yes, Thank you that is the diagram I am using. Thanks for taking the time to update the thread. None to be had. Using the original schematic, overall power consumption is about 88 watt. Sale. aeg hft agthi dituue gopc uhucbcz mke zmw dwpd uay
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