Ear 834p schematic My choice for a decent phono is the Broskie Tetra on the Tubecad. 1- The RIAA EQ network works against the 330K plate load resistor in the first stage, not the 2M grid resistor for the second stage (lowest AC impedance). Nov 14, 2020 · You might have to search the web for the 834P schematic but it's out there and easy to find. Oct 29, 2016 · on the legitimate EAR 834P you can get with and without volume control. This is a sweet sounding phono stage! I mostly use MC cartridges these days. I’m good to go following the wealth of info documented across several forums, planning on most of Jan 16, 2023 · The EAR had a little less bass, but I changed one capacitor and, maybe imagination, but I think it is on par now. Fortunately I printed off the 834p mods and filed them away. The 834P uses a detachable IEC power cord, so tweakers can go ape to their hearts’ content. If you took a Croft full pre amp and removed the vol control and input selector so it goes straight into the cathode follower and then took the feed to the RIAA network from the cathode follower rather than the second valve you have the Sep 5, 2022 · 12AT7 on a 12AX7 Phono preamp (EAR 834P clone) Last edited: Sep 5, 2022. There is so certain manual came with it and had to look closely finished build photo and do some google research. The EAR is a little more diffuse, voices are not on speaker level, but quite a bit above. In the 834P, Tim's RIAA EQ network is fed from the cathode follower output to the grid of the second stage instead of to the cathode of the first stage like the Marantz. Sep 11, 2023 · This is a review and detailed measurements of the Ear Yoshino 834L Deluxe Tube (Valve) stereo preamp designed by Tim De Paravicini. Also have a real EAR phono stage. Oct 4, 2017 · It is a real 834P Lucas has the real 834P, that is the one he is repairing. 50W Ti chip amp, one with Bluetooth and funky front led vu, several Tripath 2020/2021/2022, Yaqin and other phono-amp, Tube amps. Feb 4, 2022 · The EAR 834P, when done well, is still an excellent RIAA amplifier, which can take it up with some of the biggest names in the business. Strat-Mangler, jonwoody, G B Kuipers and 1 other person like this. Fig. Jan 1, 2021 · Lenco Heaven > Other Components > Phono Stages & Step Ups > DIY EAR 834P TRLH Phono Stage Here is an example wiring diagram for the AS-05T280 (Datasheet):http Jun 18, 2024 · Attached are the files for the TMOQ 834P Preamp, released for the benefit of the public. After listening, I can’t dispute this notion, as the purity and liquidity of sound that the 834P evinces is utterly captivating and convincing. The EAR 834P is a very simple, but rather smartly designed Circuit, implemented by EAR in a rather skinflint fashion. they wouldnt have let the schematic out into the wild. Feb 27, 2020 · Replacing the longstanding, and long-popular 834P, EAR's new PhonoBox is still tube-powered and comes with MC and volume options in addition to a 'deluxe' chrome finish Acat among the pigeons: at a time when we are being treated to a range of superb phono stages at modest prices, what for me is the true milestone of the genre has just appeared in what must be its fourth or fifth generation. The case is stamped Dec 27, 2007 · I have an EAR 834P that has developed distortion on the left channel. Doukmall sells the EAR clone in a closely matching case. There's also a thread about this preamp on the Lenco Heaven forum. Jan 1, 2021 · A lot of builders have removed that part of the circuit. Address:US Distributor:EAR USADan MeinwaldSound Advice1087 E. Schematic « Reply #3 on: 5 Nov 2004, 11:01 am Has anyone ever compared the EAR 834P with Hagerman's Cornet. Jan 1, 2021 · Hi Keith, Thanks for the encouragement and interest, I think it owes me around £500 all in. 7 #1 The 834P shined brightly in every application. I am not a fan of chrome front panel but realize this is a personal thing. It is enclosed in a tough, black colored, rigid metal case, and is fully “CE” type approved. If the site has helped you and you also want to help others, please Upload a manual, circuit diagram or eeprom that is not yet available on the site. Hi, Given that Romy already let the proverbial Cat out of the Bag (pun intended) I think I may have to make good here. on PSU, using a choke off first filter cap which is 20UF motor run and proceeded from there. After spending many hours, finally finish building it but the Aug 15, 2016 · During my visit to NYC earlier this summer, my buddy Ding loaned me his home-brewed octal version of the EAR 834P phono preamp using 3 x 6SL7 octal tubes. Nov 20, 2021 · yes, have bought several of the pre assembled units (i. It would have been cheaper to have bought a ready assembled complete EAR 834 from Douk Audio on eBay for around £200 and have Alan (Firebottle) mod it as it would have everything in place and just need the mods with some better components. Quote from: mike on March 30, 2020, 04:18:24 PM Blank Xuling boards are now 4x the cost ($199USD) of the Douk boards Apr 2, 2020 · I'm building, as slow as cold molasses, an EAR 834p clone, for a good friend, he can reveal himself if he likes. I've replaced the tubes but that didn't help. This direct experience of hearing the 834P in systems with tube and May 31, 2020 · The EAR 834P uses three 12AX7 tubes, tube 3 is a buffer tube on a cathose follower configuration. Listened to (and owned) four other phono stages over the years, some higher priced while others were less $. com site. 4A so 2A is plenty) but the extra buffer can not hurt and makes for a cleaner wiring. e. Unfortunately for all of you, it is in German but I think the schematic speeks for itself. Oct 22, 2008 · I noticed a mistake in all the schematics I saw. Have to say its sure tough to pick out which is which. 6mV at 1kHz, MM (right channel dashed). All are very good Michael Fremer wrote about the EAR 834P Deluxe in August 2003 (Vol. Mouser shipping seems quite high. I'm just about done, minus needing to wire a few bits, and I need to remake the signal chassis cover, as I didn't line up the cuts quite right on the cut-out for the inputs and tubes. EAR USA head Dan Meinwald mentioned that the 834P can be special ordered to accommodate very low-impedance moving coils such as those from Ortofon. At least there was one in the original EAR834P I had. 3 EAR 834P, THD+noise vs frequency into 100k ohms at: (from top bottom) 1mV at 1kHz, MC; 2. 9 x 1. I am a novice and I am starting to feel that I Jul 6, 2019 · I have several Douk amps. 3V (total current is 0. Jan 1, 2021 · Without schematic you have high risk of PSU destruction. Mar 24, 2022 · A 12AX7 active phono stage with a cathode follower was not really a new design when the EAR 834P came out in the early 90s. I’ve found shields on V1 especially in Phono to be always advisable if going for best measured results There is honestly only so much to get out of this topology. Mar 6, 2020 · The EAR 834P is by far the most highly regarded modestly priced phono stage and likely the best buy in affordable high-end tube phono stages and is EAR's most popular phono amplifier in England. 8): I've been meaning to review this Tim de Paravicini design for years. There is a sticky thread "DIY EAR 834P TRLH Phono Stage - Build Guide / Parts List" about this and other modifications put together by John (spaceistheplace) at the start of this amplifier forum. Free shipping. — Jul 10, 2005 · I've been meaning to review this Tim de Paravicini design for years. However, I used a toroidal Feb 15, 2023 · A while back, I picked up a stock EAR 834P. It really sounds great and I hope doing it this way might inspire someone who has been hesitant about trying a DIY tube build. Absolutely, in original form, I could not turn the gain up without it distorting and the sound was a little thin. The passive EQ pre is more or less "neutral", lots of width, good separation and focus. You can remove the power supply PCB section from the main amp, (remember to wire up the b+ to Both channels when running the b+ power leads to the main board). Well that's gonna change so here I am trying to figure out what to do to make it sound better. Feb 14, 2013 · When I had the 834P I rolled many different brands of tubes in this preamp at all positions, including some nice NOS Telefunkens, both smooth and ribbed plates, and finally concluded that the current Genalex 12AX7s, as ordered from Tube Depot and selected for low noise, provided the best results with great dynamics, warmth, air, depth of stage and solid bass. There has been a few guides on mods already over the years. Anyone able (and willing) to help me fix it? If anyone had a schematic they'd be willing to share, that would be a good start. mine came with 35V 2200uF. Dec 1, 2020 · I've owned the EAR 834P (basic MM version) for about five years. Apr 22, 2021 · The only parts that didn't match the labeling on the board or schematic were the 2M resistors, they sent 2. Nov 8, 2017 · I have this EAR 834P phono stage sitting around coz I haven't listened to LPs for a long time. It's performance is pretty good for the outlay asked here in the UK (where the MM input only Version in basic black sells for under $ 600. Pete. Opens in a new window or tab. Double your money and more than double your pleasure with EAR's now venerable but still vital 834P, a three-tube (12AX7) moving-magnet stage that also has, for moving-coil use, a pair of step-up transformers (3–50 ohms) available at the push of button. This is the Link to a side with my version. However it is quite legitimate to build as per the schematic you have posted. Posted Jan 1, 2021 · 2. If you treasure analog as I do, particularly if you're a fan of well-recorded classical works, you should treat yourself to an audition of the EAR. here is the schematic: Things that can be changed: heater caps. 00). Aug 20, 2021 · If anyone thinks that because it’s relatively inexpensive gear or bad because it wasn’t put together in their favorite part of the world (wherever that may be) - think again. Jun 28, 2020 · A lot of Thorsten's stuff has disappeared from the web. I’m about to begin upgrade modifications on a 2 chassis 834 clone I built. Jan 1, 2021 · Hello All, I've built an 834P (blue board) based on this mod thread and Jessica's PSU. Powering the preamp is a General Radio 1201-B tube regulated power supply. Davey, Sep 5, 2022 #2. Sep 21, 2021 · I just finished what turned into a rather long video series of step by step building an EAR834 clone phono stage from an Ebay board/kit. It only occurs on certain relatively high frequency sounds. In my experience none could beat the EAR for basic phono sound quality. If I had to advise you on a new phono preamp today, I’d point you to that copycat EAR again – except, of course, if you can solder. 4 indicates the way the THD+noise varies with output voltage at 1kHz. Again, what is strange is that the circuit widely available on the net, and attached below does not show the fet/12AX7 cascode. Jul 8, 2018 · Also, complicating matters the 834p schematic often circulating the web from one of the manuals which you reposted here is also not the same as the production 834p. Hello everyone. Added an example wiring diagram for the Antek AS-05T280 that was recommended in the build guide. Great value for either type. This is because the final output capacitance was entirely too small for my pre. At the time, I was using a Sonic Euphoria PLC passive line stage and the EAR just didn't work with it. Mouser in US for me is around $7 for Fedex delivery in 3 days. I have been told by several repair techs that what EAR schematics show and what is built are often quite different, as in this case. May 24, 2021 · EAR 834P then has considerably better driving ability and lower output impedance than a Croft phono stage. Jul 8, 2018 · The valves/tubes are in a closed metal enclosure, so no need to do extra shielding. enclosure is vented I believe. The stuff needs most review are the resistor types and wattages in the higher voltage and power Oct 22, 2008 · I've been looking at the schematic for the EAR a few more thoughts. 3k resistor has gone opened, I would be checking the pins on the transistor and tracing the base/collector/emitter to ensure that the circuit pcb corresponds to the circuit diagram, this will ensure that the white print Jul 8, 2018 · I am continuing to upgrade some components on my Douk EAR 834P clone, I did upgrade the Jfets to Nos Toshiba 2SK118-O, now I would like to upgrade the B+ diodes to soft-recovery type hexfreds. Apr 8, 2023 · Hi everyone! I have built an EAR 834p clone but have a hum problem. I. Many of us of EAR 834 Phono preamp, either the real thing or a clone swap tube 3, a 12AX7, for a 12AU7 as is supposed to make a better job as a buffer tube than a 12AX7, me includded. Looking to EAR design and all mods there is only one 250-280V AC required for PSU and than PSU has two outputs 280V DC - in fact this is one in parallel connection. 6 = 1. It might make more sense to move the tie point to the plate of the first stage. It’s a Zhili board set, the black and gold. EAR834 Clone Vacuum Tube Ear Yoshino 834P owners manual, service manuals and schematics are for reference only and the Vinyl Engine bears no responsibility for errors or other inaccuracies. This 834P clone, as well as the “oldchen” SEP amp I recently bought, sound quite amazing together - and not just for their relatively low prices. Pitty that supplier is not showing diagram. $2,836. Maybe the first iteration circa late 90’s but there’s notable differences now such as the JFETs you referenced. Buy It Now. plug and play). More expensive than the 834P clones but worth it for its higher performance. Oct 4, 2023 · I had LP12 with OL tonearm Clear Audio MM cart>EAR 834P>Retrothermionic Black treasure/Golden Dragon Tube Pre>Radford STA25 Power Amp>IMF RSPMMKIV Speakers. See some early impressions of mine below, first with original tubes, then trying one 1962 NOS Telefunken AX7 in different positions. Jan 1, 2021 · DIY EAR 834P TRLH Phono Stage - Build Guide / Parts List. At its $895 sticker price it's downright obscene. Dec 2, 2002 · The EAR 834P Phono Preamplifier Paul Szabady 2 December 2002 Specifications Moving magnet and moving coil tube phono preamplifier12 AX7 (ECC 83) tubesMC amplification by transformerDimensions: 5" W × 4" H × 9" DPrice: $995 (Black). Douk EAR 834P mod - help identifying components . 2mV at 1kHz, MC; 7. It's performance is There are a few models in the EAR 834P line up: EAR-Yoshino 834P MM uses the same circuit architecture as its more expensive brothers, and shares in the same high quality sound through MM type cartridges. . He provides pictures, costs, components list and some sound impressions. There should be an additional RC filter between the second stage and the cathode follower. Nov 24, 2023 · Hello. There's also a lot about the 834p and various mods on the LH forum if you're patient enough to sift through the many pages and extract the relevant info. Reproduction without prior permission or for financial gain is strictly prohibited. Need to get with Golden Gate ER to see about maxing out the build to see just how good we can get these to be. legit one below. 4 THOMO. Since there seems to be a lot more experience with the 834 in this forum and noone at diyaudio could help, please forgive me if I direct my questions at you. It is on kind loan from a member and costs US $3095 (£2,699. But OK do not know your design. Apr 23, 2021 · After Pass ACA Amp Kit Build, I thought that I can handle this but I was mistaken. They also sent a MJE13005, rather than a MJE13009, which might have worked but I wanted to use the spec'd higher rated power supply transistor. The EAR 834P is a very simple, but rather smartly designed Circuit, implemented by EAR in a rather skinflint The very much non-definitive EAR 834P Modification Guide by Loesch Thorsten. It can be This website is not affiliated with or sponsored by EAR. In the meantime, I picked up the EAR replica from our own Prime Minister and hve to find the time to sit down and seriously compare it to the maxed out custom Quicksilver Audio Phono Preamp. Several other sellers sell the EAR clone in a more traditional aluminum case. EARYOSHINO 834 8L6 AMPLIFIER EAR YOSHINO; If you have any question about repairing write your question to the Message board. Most transformers will have similarities. This is a different league of its own. I have followed the grounding scheme (see picture) from the Lenco Heaven forum (and also implemented the mods) but is seems like the amp is picking up noise from the inputs. Pre-Owned. 26 No. Schematics and Other Stuff » EAR834 Schematic; Gallery Browse gallery; Random albums; I'm Feeling lucky (No Previous Image) Up to Schematics and Other Stuff. The Sound. Includes BOM and schematic for the main board, tube power supply and SS Power supply in various flavors. Some pics of the progress so far: Dec 4, 2016 · I have two 834 boards. The pedigree of the EAR/Yoshino 834P is unmistakable. It is available in 3 different models. Apr 23, 2021 · If there is higher than 285V after resistor 1,3k when MJE 13009 is disconnected, which I’m assuming there is because the 1. To purchase 834P spares or accessories, please contact the company via their website or visit an authorised retailer. and EAR also makes a dedicated SUT unit) EAR offers two versions of 834L and 834P livery: the luxury chrome-face-plate-with-gold-accents version, as seen on the photos above, and a “black box”, relatively inexpensive alternative. Soundstage is different on the two tubies. Oct 22, 2008 · Another 834p phono build hey - too many new phono threads to start a new one, but to resurrect one i based my most recent whim upon, here's a pic of my newest build - and i'm no scot, 'cept in spirit and maybe my mom's mom's mom's side, but who ain't ;^) - used the schematic except slight diff. The 834P in basic black will Jun 18, 2024 · The very much non-definitive EAR 834P Modification Guide by Loesch Thorsten Hi, Given that Romy already let the proverbial Cat out of the Bag (pun intended) I think I may have to make good here. 2M, and about a half dozen others were simply out of spec. Logged Print; Pages: [1] Go Up EAR 834P British Vacuum Tube Phono Stage Amplifier MM/MC ECC83 Tubes USED AS-IS. Also attached is the original version of Thorsten's "The very much non-definitive EAR 834P Modification Guide" Jan 1, 2021 · A user shares his experience of building a phono stage with Chinese PCBs based on the EAR 834p schematic. For this no need registration. Finally, egged on by readers, here goes. Cheers, Steve Mar 24, 2019 · And this is the EAR 834P Phono Preamp in chrome with gold accents (Note: an MC/SUT stage is an option. Jan 1, 2021 · DIY EAR 834p phono stage - a short evaluation/ test with those chinese PCBs. After a few mishaps – many thanks for the advice / fixes Jessica – it's up and running with some Jensen caps, which sounds great going into my passive pre and Leak Stereo 20. Have a nice Day! Mar 17, 2023 · EAR 834p clone built in 2021 (Zhili Audio board) Power supply 230V (Australia) What to change (my thoughts). Feb 14, 2002 · The very much non-definitive EAR 834P Modification Guide. Sounds really good as is, though clearly a ton of room for improvement. Ridgewood StreetLong Beach, CA 90807 USATelephone: 001 562 422 4747Fax: 001 Now Listen Here: Vandersteen, Acora, Pure Fidelity, EMM Labs, Bel Canto Design, Innuos, Ayre, Rega, Audio-Technica, AudioQuest, Finley Audio EAR-Yoshino 834P Positive Feedback, Vol. The full 4A is not required for 6. from Nov 30, 2021 · The implication is that the designer believes that moving-coil cartridges should be loaded down to tame high-frequency resonances. 00. Posted by Thorsten (M) on February 14, 2002 at 08:32:50 Hi, Given that Romy already let the proverbial Cat out of the Bag (pun intended) I think I may have to make good here. Price: $1295 (Chrome). Jul 10, 2005 · The EAR 834P is a remarkable piece of work: a reference-quality phono preamplifier that would feel at home in a system of any price. rmmhrrzatmacwnccigftunxxxwdwatqngjargomoeipxigcfikf