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eico hf-86 manualIf you have additional documentation please consider donating a copy to our free archive. To purchase HF-86 spares or accessories, please contact the company via their website or visit an authorised retailer. Read or download the pdf for free.Each power amplifier is conserva- tively rated at 14watts outputcnd employs aWilliamson- type circuit witha push-pull EL84-outputstage. The two amplifiers maybe operated in parallel to deliver 28watts for non-stereo use; either input can be made common for both amplifiers by a service selector switch. Other con- venience features include a level control at eachinput, an a-c power switch, two convenience outlets, and a Fuse in an extractor post mounting. Probablythe mostinteresting innovation is a new tube type, the 12DW7, developed at EiCO's request and appearing For the first time in this amplifier. This newtube is a medium-mu trlode of the 12AX7 type anda low-mu triode of the 12AU7 type in a single envelope with coiled heater onstruction; this type is controlled in production for audio use. The IZDW7 conveniently provides significantly better performance characteristics Harmonic Distortion: 16 watts (8w.Transient Response: Excellent square wave reproduction Inverse Feedback: 20db The 12DW7 will also be available directly from EiCO. Other important design Features, characteristic at all EICO amplifiers, are a rugged and generous chassis, maximum separation at power tubes from each otherand heat—sensitive compo- nents, trouble-free point—to—point wiring, and painstaking attention to reducing distortion without compromising stability. Filter electrolytics and rectifier: operate well below maximum ratings to insure long life. The HF-86 has been designed to maintain its excellent characteristics under speaker load (including electro- static types) as well as the resistive load normally used for testing.http://redcointl.com/public_html/userfiles/daihatsu-feroza-f300-workshop-manual.xml
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Phase corrections have been provided at both extremes of the audio spectrum to insure stability under all conceivable conditions and to insure that variations in components and construction wllinotatfect the perfor— mance. Stability is maintained on all speaker tops with loads ranging From zero to infinity. Overload character- istics are excellent and the HF-86 will not esdtibit bounce or flutter under pulsed conditions. Stability Margin: 15db Sensitivity: 1. 15V for 14w output. Hum: 90db below rated output. Speaker Connections: 4, 8, 16, and 32 ohms. Tubes: 2-12DW7, 4-ELB4, 2-5281. Power Source: 117V, 60. Shipping Weight: 16 lbs. Read or download the pdf for free.POWER SUPPLY 110 — 120 Volts AC, 80 Cycles An nny’manner, m prombxted. Printed 1n 0.3. o! Amerlcn. Something went wrong. View cart for details. Sell on eBay Sell Vintage Manuals User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Please check your inbox, and if you can’t find it, check your spam folder to make sure it didn't end up there. Please also check your spam folder. Please use the form below to log in, or click the 'sign-up' tab to create a new account. Please let us know if you have any questions or comment on how we run Hifi-Manuals. The HF-86 belongs to the HF series. The owners manual is used as an reference guide, instruction manual and instruction book. The service manual functions as a repair guide for troubleshooting and sometimes contains tips for refurbishing and modifications. This data is collected and thus shared with Google. Got it. Please do not offer the downloaded file for sell only use it for personal usage. Looking for other manual? For this no need registration. May be help you to repair. You could suffer a fatal electrical shock. Instead, contact your nearest service center. Note! To open downloaded files you need acrobat reader or similar pdf reader program. In addition, Also some files are djvu so you need djvu viewer to open them.http://www.nam.org.np/userfiles/daihatsu-feroza-f300-service-manual.xml These free programs can be found on this page: needed progs If you use opera you have to disable opera turbo function to download file. If you cannot download this file, try it with CHROME or FIREFOX browser. Translate this page: Relevant AUDIO forum topics: Denver DSS-100-ban nevtelen IC Szisztok!Ebben kernem segitsegeteket! Udv! MateA fenti hiban hogyan lehetne segiteni zold szinu futoszalas kijelzo van benne pontosan nem tudom megnevezni a tipusat.Udv nektek! SOH-AAU es SOH-AAH lezeregyseg helyettesitheto-e egymassal? Sziasztok! Tudja-e valaki, hogy a SOH-AAH lezeregyseg helyett beteheto-e a SOH-AAU? Ill. mi a kulonbseg kozottuk? Koszonettel. Attila PIONEER KEH-P 9200 RDS-alkatresz Sziasztok!Ha van valakinek ilyen magnoja kerem jelezze,megvennem!Mukodokepes alaplap kellene a tobbi fodarab nem lenyeg,a vegfok ic sem.Koszi! Similar manuals: You can write in English language into the forum (not only in Hungarian). Detailed pictures with parts list and descriptions, with a full schematic. Pages are in excellent condition. Use single quotes (') for phrases. All Rights Reserved. Looks like this page is missing. If you still need help, visit our help pages. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Thank you for the help, the link for the schematic is here: A pentode voltage gain block yields the requisite extra gain. Compare the Dyna ST35 to the HF86. You will see similarities. Now, look at the ST70. I dont know anymore about them than that, you can find links to schemtics here EDIT: DOH. I just noticed your link, so obviously you know about these already. IMO, you should bite the bullet and buy AnTek's model AN-4T360, which costs 50 USD. Unfortunately, 7199s are fast disappearing. To do the Dyna topology, 2X EF86s and an ECC99 are in order. IMO, you will get better sound from a Mullard style circuit that uses a 12BH7 and 2X 12AT7s as the small signal tube complement.http://eco-region31.ru/boss-chaos-c700-manual Power is needed for the 12BH7 and the bias supply. Use Schottky diodes in the multiplier and be switching noise free.Would the 1650G work in these circuits instead of the 1650N, because I'm a little strapped for cash cause i'm a college student haha.TANSTAAFL! Perhaps Edcor can help you hold costs down. Their model CXPP60-8-4.2K appears to be suitable. If you are the proverbial dirt poor student, consider lowering your ambition and building around 6V6s or EL84s. BTW, what speakers are you intending to use. Have you applied Paul Joppa's 102 dB. Rule?Resources saved on this page: MySQL 16.67 vBulletin Optimisation provided by. Si e verificato un problema. Vedi il carrello per i dettagli. They are suitable for your restoration ” Ulteriori informazioni - si apre in una nuova finestra o scheda L'importo e soggetto a modifica fino al momento del pagamento. Per ulteriori informazioni, vedi i termini e le condizioni del Programma di spedizione internazionale - si apre in una nuova finestra o scheda L'importo e soggetto a modifica fino al momento del pagamento. Se sei residente in uno stato membro dell'Unione Europea eccetto il Regno Unito, non puoi recuperare l'IVA per questo oggetto. Per ulteriori informazioni, vedi i termini e le condizioni del Programma di spedizione internazionale - si apre in una nuova finestra o scheda I tempi di consegna possono variare, specialmente nei periodi festivi, e dipendono dalla localita del compratore Ulteriori informazioni - si apre in una nuova finestra o scheda Ulteriori informazioni - si apre in una nuova finestra o scheda Ulteriori informazioni - si apre in una nuova finestra o scheda Ulteriori informazioni - si apre in una nuova finestra o scheda Ulteriori informazioni - si apre in una nuova finestra o scheda They are suitable for your restoration project. ” Contatta il venditore - si apre in una nuova finestra o scheda e chiedi il servizio di spedizione per il tuo indirizzo. Inserisci un CAP valido.http://lycee-langevin-wallon.com/images/casio-4383-manual.pdf Inserisci un numero inferiore o uguale a 1. Per le transazioni idonee, sei coperto dal programma Garanzia cliente eBay se ricevi un oggetto non conforme alla descrizione. Tutti i diritti riservati. Accordo per gli utenti, Privacy, Cookie e AdChoice Norton Secured - Offerto da Verisign. It may not display this or other websites correctly. You should upgrade or use an alternative browser. The Eico HF-86 is not a preamplifier, nor and integrated amplifier. It is designed to be driven by an external stand alone preamplifier like the HF-85 or ST-84. It is just a stereo power amplifier. Just trying to keep the record straight. DaveA basic power amp.:g:GQAAAOSwa81XRysX I WANT one.The Eico HF-86 is not a preamplifier, nor and integrated amplifier. Just trying to keep the record straight. Dave Click to expand. I knew that,but misspoke.I'm looking forward to hearing whether their Acrosound Iron will result in these actually sounding better than my HF-89.I'm hoping there is someone near Green Bay Wisconsin who can help.anyone interested in helping.To answer your questions: if you can solder and follow the Eico construction manual, you can restore if yourself. Otherwise there are people who can do it for you. And there are people here who can help. There is one well-known mod to the loudness switch that you can do later. First step: download the manual and have a read. Now I have only restored 2 HF 85s and 2 HF12s, small units, I found them very easy to work on and the assembly manual definate GET ONE. The bigger amps like yours may be abit more complex but still quite manageable. Besides, getting into one is part of the fun and you get to say I did it. So I say jump into it with all 4 feet and dont look back. Whoops. I mean both feet. The main thing is to have fun. Otherwise an off the shelf amp may be a better choice, and they do make some duzies these days.By the way, Twang, if you plan to restore this Eico yourself I think you should start a new thread so that all the tubeheads here can look in if they want to. The principles are the same for most tube amps.To answer your questions: if you can solder and follow the Eico construction manual, you can restore if yourself. First step: download the manual and have a read. Click to expand. Now I have only restored 2 HF 85s and 2 HF12s, small units, I found them very easy to work on and the assembly manual definate GET ONE. Otherwise an off the shelf amp may be a better choice, and they do make some duzies these days. Click to expand. By the way, Twang, if you plan to restore this Eico yourself I think you should start a new thread so that all the tubeheads here can look in if they want to. The principles are the same for most tube amps. Click to expand. Heading something like: 'Eico ST40 first tube restoration'. The value of that is that the thread is yours and can focus on the restoration of your unit.It needs some love before I can hear it. First piece of Eico audio gear but I already had an Eico signal generator and VTVM.Heres how I did mine. If you need I can post pics with all the gory details. Or do a 'communication' (conversaton) PM.Mine seems to be cleaning up pretty well. I hope it ends up looking as nice. (And sounding even better). Use these links to ensure a small donation to Hifishark upon your purchase!Get it delivered to your inbox. By continuing to use the site you accept our Terms and Conditions of Use. Learn more. It may have been moved, or removed altogether. Perhaps you can return back to the site's homepage and see if you can find what you are looking for. They don’t make manuals like this anymore, looks more like a service manual, has lots of schematics Check pictures You are the light of the world. Bluebook The right price. Every time. Virtual Systems Let the world see what you've built. Merch Rep the community and hobby you love so much. SIGN UP LOG IN Forum The conversation begins and ends here. Learn Welcome to Audiogon. Both channels are in working order. All tubes are old stock Eico by Mullard tubes. Exterior. 775.00 Sorry, this listing has ended. This Eico amp is in working order. All tubes are old stock Eico by Mullard tubes. Exterior shows some scratches. Overall in good shape. Comes with original packing box and owner's manual. Specifications: Power output: 14 watts per channel into 8? (stereo) Frequency response: 10Hz to 100kHz Total harmonic distortion: 1 Input sensitivity: 1.15V Signal to noise ratio: 90dB Speaker load impedance: 4? to 16? Valve complement: 2 x 12DW7, 4 X EL84, 2 X EZ81 Dimensions: 5 x 13.5 x 9 inches Weight: 16lbs Year: 1963 rewindaudio member since June 2014 Rewind Audio Verified Dealer Last 12 months 72 100.0 All-time 109 97.3 Items from this seller Rewind Audio E-STORE View All Products For Sale Need Help. NEWSLETTER Weekly Digest of hottest items, coupons, offers and more. If you have any other links By Kelly Holsten This page is a reprint of his I think an upgrade to the ELNA Cerafines A very informative page, nonetheless. Roger Stevens EICO HF- 81 Mods Regardless, In addition, Roger is a This is a must He loves the HF-81. Audio While there are not as many vintage pieces Currently, there are seven Tell them that Tom Mobley wrote All of the PS trans Drop them an email. EICO HFT-90 Mono I'm glad I never sold the little beast as It is mono but sounds so warm and natural But there is If you own an The EICO HF-86 notes are helpful Other points of Be sure to also check out One of the largest selections Very honest and a Much better selection than at Neds. Another He has a dedicated page for his 12AX7 See the tube selection at right. While NOS Ditto for Welborne Download Michael Percy Parts The Scott has a It has a very. Enter your search criteria. Click here for tips on using our searchThe EICO HF-32 is an interesting integrated amplifier. Joe. The HF-32 is the integrated version of the above. Available from time to time on Ebay. For the most part Eico amps sound very nice. Most l. The one in an EICO HF-32 has two loudness taps in addition to the normal high end, ground end and moving center tap. I. My schematic of the HF-86 would discribe a typical PP EL-84 Stereo Power Amp. I have an HF-81 Integrated Amp that is almost identical in the design of. I listen to vinyl most of all, so I'll need a great phono stage. Which would you recommend-- an Eico HF-85, or the For. I'd say you're headed in the right direction with the tubes tha. However, I still wish to learn the internal values of the old parts for posterity and to help others in re. I just acquired some new Eico pieces. Like my last one, these were installed in. A friend has an old trafo from a Dynako MK2 amplifier: could it be used with the Eico. What specs should I look for? Re. It is missing the cage and frame around the face plate (I have the face plate itself. I just need the frame). Are there other Eico products like the H. You can use those values to fix your Eico. The best solution is to bypass the loudness circuit. AFAIK, the treble and bass control PEC are the same for all of the EICO units. If you need to kno. I received the Eico yesterday and am expecting the Waves today. I'm anxious to hear how it will sound. If the Eico doesn't work out I also. Ha! The Dynaco gang says nothing is better than the Pas.This past weekend I happened upon an Estate sale and discovered an Eico HF-35 and a Heathkit W7-4. I've heard good things about Eico amps so I knew. You could either look for a parts unit with a cover (HF-8. I have the Sams folder for the HF-12, dated 7-59. Email for a copy - tbavis(at)rochester(d. I already have the information for the internal parts on it. The one I am inquiring about is shown on the schematic as PC2, and. Many thanks in advance.. The Pilot appears to be a far more complicated circuit with little room to work on. The eico. I don't personally have a lot of experience with the HF-81, but my parents did use its monoblock sibling the HF-1. Can it be rewired to run in triode mode and how. Thanks.. If the later, try and find an Eico HF-12, which used the same output transfomer. Best, Ross:. Do you guys have any experience with W5m or HF-35 to share with us.. By the same token, it stands to reason that you are no. There are Sovteks in there now which I'm not really thrilled with. Would Teslas be a good choice. Or should I just go Vintage T. As the upgrade bug has caught me over the pas. It is the power transformer what seems to be defective in m. Plugged them in and hooked them up to a solid state preamp and they do sound good. From what I can tell they are 30w and use 4 EL3. I have had several Eico amps, and never had the PT run so hot I could barely touch it. If anything, they were pretty beefy and not underdesigned. B. I have an HF-87 sitting around with the bottom panel off, so I can look at the screws.Temperature measured at the end bells is around 45-50 deg C. The output transformers are ru. I have a SAMS Photofact but am not sure which are the coupling caps. There are 4,.025 caps t. I know that they are not a direct replacement for the 12au7, so I was wondering if they will work in my Eico HF-. I can check the voltages, but I believ ethey are pretty conventional for a 6BQ5's. Also, I've been using this amp with various tubes with no problems. F. One of them gets hotter much faster than the other one and has substantially more vibration to the touch (the power transformer). My assumption is that something is causing the. Any knob from the Eico HF series of audio products is ok as long as it is the little brown plastic knob. I am also looking for a HFT-94 A. I am considering this one too. Could you tell me about differences between Zen and Eico HF81. Someone at audioreview.com said in a critic about Eico HF8. Cost of entry will be much much less than a Jolida and the value will go way up after your restoration.Just finished repairing one that I received as a gift. Other than the missing top cover, it's in good cosmetic condition, and. I have recently purchased a second unit and now realize that it does not get very hot at. Both are good amps. In a direct comparison, I suspect that you will. Example, would a dynaco PAS 3 preamp and a dynaco st-35 tube amp sound better than the dynaco sc-35 integrated tube amp.Currently re-tubing an EICO HF-81 integrated.Do a post someone will email you the manual.. I got out of the Dynaco business years ago after I was able to g. A couple of Dutch Amperex small signal tubes, and of course American (Westinghouse. I really don't know)7591s in the stereo 70 integrated I had. I actually do enjoy the N805s with the eico HF-86s or Pilot SA-32. I was wrestling with the idea of a bigger brand new amplifier only if it offered better sound. Or, buy. A true audio example of the whole being greater than the sum of the parts. Have you tried any of the Eico EL-34 amps. HF-87 HF-89 were stereo and the HF-35 and 50(?) were mono.. It probably should be on the Tubes forum anyway. Basically, I am wondering wh. I already have schematics, but would like as much documentation as possible. Thanks very much!:. I purchased 8 new Sovtek EL-84s for the pilot and one of the eicos. I recently compared the newly re-tubed Eico hf-86 with the original. The uni. Your FP is a sonic match for items that cost 4 figures at retail. I think your observation that the FP is a better line stage than that in the EIC. Considered one of the best 6bq5 basic amps made. Others of the same quality are Eico HF-86, Heath AA-111, Fisher SA-100. These are all stereo amps. Fair price for any of t. Just remove them carefully so you can put them back at a latter date. I am using the outputs from a Eico HF-8. The HF-22 uses 6L6 outputs and the HF-35 uses EL-34s.. Why not post over there and see what kind of feedback you get? Eli D.. You would just build it twice. As for HF-50 vs HF-89, I really couldn't say.Since you have one good and one bad Eico, measure all voltages on both units and compare them - maybe it will give you some ide. My recollection. I was helping him search for another 14 and found a few 12s. I don't recall if I found 12 or 12A.I can work both, although the Eico will be physically easier, it's no big deal in the long run. I'm wondering which is the superior sonic instrument:) Johnny::. Heath W-3, 4, 5; Eico HF-22; Pilot AA-902a; Craftsman C-500; Fisher 70a, 80a All would be between 20 and 30 wpc; all use 6L6 or variation. If you can get away w. Now tell me how to use it. (10.32) It looks to be in great shape for its age. I've got one question for you guys. How do I use it? 1. I don't see a power. They are remarkably open, clear, and alive but are, as you said quite lig. Can you send me some pics and your price. Also open to trade. I have lots of vinyl.You will want to detune that 100K resistor until you once again have 120V on the plate of the first stage, then you may be able to make a valid compa. I was not very pleased. They made my eico sound harsh and I was unable to listen very long without strain. I put my tired old. Thanks Peter. These amps use 7591 output tubes, which can be expensive to replace. The Eico. Any thoughts and or suggestions would be appreciated. I have two and will need to match all tubes (expensive) to combine them. A. You may want to check on Mobile Homeless and RStevens at: www.home.earthlink.net www.home.netcarrier.com Tonefully.::: TOPIC::. The old Dutch Philips are better but I'm not ready to drop that kind of money on them - especial. There seems to be a new, DIY, VS vintage, mod-rebuild thing going on in the thread. I would just like to say that either could. I am biamping at 72 Hz and need a top end tube amp to drive my Radia 520DX ribbons (88 db). On e-bay both the ST-70 a. I would also add Fisher 30a, Eico HF-14 monoblocks. Personally, my dream system is a pair of stacked ESL57's driven by r. Heck, can even be operated as a basic amp by using tape out jacks as line i. Is there a web page that could walk me through it. I modded a Dynaco SCA-35 following R.Stevens's web page. I have no training in electronics but. i like. to twe. Probably a 2A3 design. I like the design and build of the Cary li. Both of mine do. The 12bh7 draws twice the heater current. Tre'. Lots of fun building it and a great product. Super. I know it would bring the voltage up and I'd have to use a resistor or resistors to drop the voltage. Wha. I have a spare 12AU7, so if one's weak, I can probably swap it as a temporary fix. I did try hooking up a stand-alone pre-amp to the tape-out jack on the back of my amp. (Thereb. I'm just wondering why Eico gear is in such demand now. I'm a newbie at tube audio and I'm a little surprised that vintage gear is going at prem. I cannot say what tubes are better - the Russian tubes or the original Mullard EL-84s supplied with the Eico. Perhaps, the Russian tubes are more focused and th. The Black is used in all cases.I considered emailing you directly but did not want to bother you again.Most were sol. The EICO output iron is excellent from all I have experienced. These amps would be a great find and with some care to weary capacitors (in. I plan to try rewiring the eico HF-86 for triode output again today and will let you know what happens. As you noticed, the HF. As you know, it's a SS discrete preamp. Mine was upgraded years ago by my cousin. He basically added capacitance to the power supply.. I hate buying thing. Customer said his line vo. BTW, how did you connect the FP up to the EICO.I have my Eico Hf-81 in mind.. Thanks for your thoughts.. I like the sound, but bass responce is lacking to my ears. Fisher SA-16 is an industrial looking console amp. However the sound is sublime. Nice tube sound from the war. Bypass the suspected electrolytic cap and connect a temporary filter ca. I rebuilt a year ago, using LCR electrolytics to replace the stock power caps, replacing value with value (as near as I could), bypassed with Solen PPMF. The val. Leaves enough in the pocketbook for new tubes and caps.I will let you know how it goes. Lance. Even tho they are only 10 ohms or. I mostly bought it because I was a poor college student at the time. But hey suprise suprise - had several f. As for the input question, I do know the 102B has a selector switch easily visible on the. I'm sure the sound will be a bit different with each amp, but at least I can enjoy them in the mean time. I'll probably sell the Heathkit and use t. My question is this.to employ this integrated amplifier as a dedicat. I just replaced the tubes for the first time and thought I would first check the bias before. I love mine. It has new caps and Amperex tubes. Now all I need are a pair of Quads to go with it.. The Eico's are integrated amps but can be used as po. I'm sure it's a fine sounding amp as are the other early Eic. If they are, which one is better performer. What can you say about them if you compare them with a SET?. Try swapping them and see if the weakness follows the tube. If one is weaker than the other, the channels will not be equal in volume. Tom. If it is in good shape, have it restored and enjoy it. You will be surprised by the sonics.. Now tell me how to use it. (8.37). Yes that is where a fuse goes. You need to find a cap for it.a common item.. Please do a search on the hf85 on this and the vintage board.. When I received the cary in 2003, it sounded marvelous right from the box with stock tubes (I had a different flat and speakers then (Snell E-III). The speakers I use now just don't. I will print it out and try to follow your in depth directions. Sure would be nice if you lived in Central Florida! Lance. The HF12 may fit but can't be sure.::: TOPIC. Cage, endcaps, faceplate. Email me.JH. I am really excited about getting them. I've tried the Waves with two things. I bought an old Eico HF-85 preamp and tried the Wa. Of course, I had to spend another two weeks to trouble shoot to make this amp working. Now I'm ask. I would look at any of the Fisher integrated amps that use either 7868 or 7591 tubes. Good for 25-30wpc. Uniformly excellent sound. Others like the comparab. Now tell me how to use it. (8.12) Be carefull firing up your new little jewel. But when all is said in done you should be in for a real treat from what I hav. If you're not limiting yourself to new production, you'd be hard pressed to beat an EICO HF-81, IMO.If two amps are near original spec.Thanks, Joe:::. Make sure same brand capacitors are used in each amp.. I would remove them from service as I have found that when a Chinese EL34 goes, it goes out 4th of July style. If you measured 24 watts total for p. The last no I had for Old C. I've had pretty good luck with Sovtek EL84M and Tungsram EL84. And this is after a few years, in amps used for gigging. The Reflector 7189A is another tough tube.. I am a guitarist who started studying old books from the library a couple of months ago on tube electronics. I am at a disadvantage since the only th. I am no expert; probably one of the 299's, but not sure which one. I only have an LK-72. The EICO HF-81 is also very fine. It's my daily driver, althoug. I realize that may be a tall order when going custom.. Not a good option for hifi amps at all. Al. I am leaning toward purchasing an atmas-phere M-60. I just hope that it will offer me more magic than my eico HF-86 pair which sound really good.. Output is 20 watts. They are also readily available on Ebay. You can triode them, convert them to use EL34's, or even convert them to use 6B4G's as I have. They are. As an input, it is independent of the selector switch position. According to the manual, it looks like it's intended to be an output, but for some reason it also. Now tell me how to use it. (7.90) You might want to visit Mobile Homelesses web site.LOL - yeah, it took me a some time to figure out h. The shipping weight only 12 pounds only!. At least it will rule out the tubes as the culprit. I wouldn't dis. Anyone have any sugges. I have had issues with low sensitivity and therefore low max volume output using a Dynaco stereo 70, Eico HF-86, or a Pilot SA-2. After listening through a whole live cd I didn't notice much difference compared with the Sovtek. I went and walked the dogs and came. The output transformers are spec'ed at 7500 ohm primary. Hope this helps:-). Try limiting your search.