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schematic

  1. G

    Need help with Admiral Chassis 20A6 (PWS-E6183AS) — SAMS 938-3 Parts Info

    Hi everyone! I’m currently restoring a vintage Admiral PWS-E6183AS with Chassis 20A6. I’m doing a full high-end recap using Nichicon KZ and Elna Silmic II. I’ve hit a bit of a road block with the small "brick-style" capacitors. Specifically, I have 75pF and 10pF caps that have an underline in...
    • greensour
    • Thread
    • 20a6 admiral pws-e6183as restoration sams 938-3 schematic silver mica
    • Replies: 1
    • Forum: Solid State
  2. PattonD

    Mitsubishi DA-R15: Diagnostic Project

    I bought this DA-R15 for $30. According to the previous owner, it was functioning perfectly fine until a turntable was connected; it hasn't produced sound since. It’s now on my bench as a testbed for learning how to diagnose, and hopefully repair. That sounded like a protection circuit so I took...
    • PattonD
    • Thread
    • da-r15 mitsubishi novice schematic
    • Replies: 14
    • Forum: Solid State
  3. tutor_turtle

    sonic frontiers SFL-1 service manual anyone?

    Got a Sonic Frontiers SFL-1 that works in direct mode only. Before I delve into it, it would be nice to have a service manual or a schematic at least. Are they still in business?
    • tutor_turtle
    • Thread
    • schematic service manual sfl-1 sonic frontiers
    • Replies: 7
    • Forum: Tube Audio
  4. G

    SX-1010 web databas

    Hello sx.1010 friends. I am in the process of renovating my sx-1010. But it was difficult to follow all the advice about components. Many are outdated. So I have made a website that contains all the circuit boards and components. It also contains pdf files of all circuit boards, both...
  5. B

    Need for Stage 2 Schematic

    Does anyone have they can share, a great sounding highest quality second stage amplification schematic for a 12AU7A or 12AT7A tube through a tone circuit then into 6U8A phase inverter? My pre amp (schematic attached) gives and output at about line level of 0V RMS to 2.3V RMS.
    • BillDWY
    • Thread
    • 12at7a 12au7a schematic stage 2
    • Replies: 18
    • Forum: Tube Audio
  6. E

    Magnavox Console Amp Schematic

    Hello, does anyone have a schematic for a Magnavox solid state console amp? It has a few PEC couplates and I want to know the schematic for them. I find this little amp to be quite solid (no pun intended) so here are some of the numbers I found on the amp itself. Chassis: 637680-6 242421 On...
    • Eafnb
    • Thread
    • console amp magnavox schematic
    • Replies: 0
    • Forum: Solid State
  7. Stuart Pedaso

    Who puts midrange level control in the woofer circuit? -- Sansui!

    While exploring the Sansui SP-1200/1700/2500 crossover family I somehow got sidetracked into SP-3000 land, who's crossover proved unrelated to the aforementioned group. But before resuming the original mission this oddity caught my eye and piqued my curiosity. SP-3000 is a typical "kabuki"...
  8. S

    AKAI GX-1820D Power Supply Board

    I have been going off this Service Manual Parts List for GX-1820 / 1820D I replaced the Capacitors and Diodes on the Power Supply Board (after doing it months ago wrong), but to do so I desoldered all the wires from the board to get it out and change the caps. I took pictures of how things...
    • Smack2k
    • Thread
    • akai 1820d reel to reel schematic
    • Replies: 0
    • Forum: Tape
  9. A

    Decca Allegheny IV

    Hello, I have a 1959/1960 Decca Allegheny IV that I am trying to find a legible schematic for. There is one glued to the inside that I cannot remove without ripping, and even if I did, the print is so small that I cannot read it. I have checked Sam’s photofact and it seems to skip over this...
  10. A

    Nikko QSR-4040 & Harman Kardon SR-300b documentation search

    Hello, I've currently got two receivers on my bench, one a late 60s Harman Kardon SR-300b, the other a Nikko QSR-4040 quadraphonic receiver. I an coming up dry on schematics for both. The H/K is faulty with bad hum and no tuner output. I've tried some troubleshooting but it's essentially...
  11. B

    DD75 Schematic needed

    I got a Garrard DD75 very cheap in non-working condition. I have made some repairs to get it working, although i will need to clean and adjust erratic speed controls. I got a User’s Guide with the unit, but I would like to get detailed schematic diagrams and have not found any by searching this...
    • Behajder
    • Thread
    • dd75 garrard schematic turntable
    • Replies: 2
    • Forum: Turntables
  12. DaleEMartin

    Looking for schematic of JVC QL-7 power supply

    (Long time lurker, first time poster...) I have a JVC QL-7 that I bought a few years back and have really enjoyed. Recently it stopped powering on. I dug into it and the power transformer's primary measures open. (Not sure why that would happen - we didn't have lightning or anything like that...
  13. Mr. Yamaha

    Finally found: Accuphase P-300L Service Manual + schematic!

    Dear Accuphase lovers, I was searching for it forever and then all of a sudden *poof* it was uploaded in high quality to Hifi Engine :banana: Complete service manual + schematic and adjustment info. Please beware that it is for units starting with serial number F4Y001 I tried to upload it...
  14. B

    Philips 7871 receiver problem

    Hi , I have a philips 7871 reciever that is wonderful. However, it started making loud buzzing noises and crash sounds. This happened regardless of the source. It also flashed the protection mode. I shut it down. I hqave a local tech in Maine, Kent Palmer, but he cannot find any schematics or...
    • Bryder
    • Thread
    • 7871 philips protection mode schematic
    • Replies: 1
    • Forum: Solid State
  15. S

    Perreaux Audiant 80i schematic

    Hello, I purchased a used Integrated Amp by Perreaux, the Audiant 80i. Unfortunately, I need to bring it to my local shop because the right side of the speaker output is not working. We have no official dealers in Canada and my region, so I was wondering if someone would have the schematics of...
  16. Frank Wild

    Help with loudness switch Kenwood KA-3500

    This is the detail from the schematic of the Kenwood KA-3500 integrated amp, showing the loudness circuit. Front panel switch has three positions: treble filter, off, and loudness. After replacing the capacitors and a few transistors my amp is fine, except that when I switch the loudness on...
  17. A

    Schematic Needed for Pilot 746 Receiver (654 Series Schematic Also Ok)

    I need a schematic (or full service manual) for the Pilot 746 receiver (from 1962-1963). I believe a schematic for a Pilot 654, 654M or 654MA will also do, since I’m looking into the power supply and it is likely that all four of these receivers used the same-design power supply. I will be...
  18. david winter

    QR-6500 / QRX-6500 : stuck with a different version of the F-1322 FM decoder

    Hello, I am close to finish restoring a QR-6500 (serial is 211091683 if this can help with differences / mods). I need to verify the position of a strap (see picture below) on the solder side of the F-1322 decoder board. The service manual seems to have the right schematic (at least something...
  19. W

    Carver PM-350

    I am working on a Carver PM-350. The only schematic I can find online is low res and hardly readable. Does any generous soul out there have a better schematic, and will share it with me? The board layout drawing would help too. A ledgeable trace side drawing would be great too. I want to fix...
    • Way San
    • Thread
    • carver pm-350 power amp schematic trace diagram
    • Replies: 1
    • Forum: Solid State
  20. I

    Micro Seiki DQX-1000 Quartz Lock(QL) problem. Help needed.

    The QL in my DQX-1000 is spinning the TT at 40 rpm. It's been working fine for well over 30 years since I first owned it. Months ago, the problem started but quickly returned to normal for weeks/months after one day. Now it's here to stay. I tried to locate the schematic for the QL circuitry...
    • ianm0
    • Thread
    • dqx-1000 quartz lock schematic
    • Replies: 0
    • Forum: Turntables
  21. david winter

    Sansui 771: incorrect polarities for C17 / C18 on F-1504 preamp board and schematic ?

    Hi, I have been wondering what caused some low background noise on a 771 which I almost completely restored. Two electrolytics on the F-1504 preamp board (C17 and C18) apparently have incorrect polarities both on the schematic and the pcb silkscreen. They had -5V accross them. The 2SC1313 were...
  22. KNielsen

    Older Aragon/Acurus schematics

    Hey AK. Since 'Indy Audio Labs' decided to skip their legacy products on their webpage, where good information was available regarding older Mondial/Klipsch manufacturing, I thought this thread would be a good idea. Many schematics from Aragon and Acurus is no more available, and cannot be...
    • KNielsen
    • Thread
    • acurus aragon klipsch mondial schematic
    • Replies: 19
    • Forum: DIY
  23. Stuart Pedaso

    Realistic NOVA 6 crossover schematic -- another look

    Some classic speakers are fabulously documented while many are shrouded in mystery. Which must frustrate hobbyists, judging by frequency these forums are peppered with unanswered requests seeking crossover data. Feeding my own curiosity about vintage Optimus and Nova products has unearthed...
    • Stuart Pedaso
    • Thread
    • 40-4019 40-4019a crossover network nova 6 realistic schematic xover
    • Replies: 7
    • Forum: Speakers
  24. D

    Luxman R-1030 recap

    Hi, I am recapping a Luxman R-1030 for a friend and have two small questions. There are elco's in a type of housing I have not seen in my previous recap projects: little blue elco's. Are they also to be replaced? (see picture) Second question: The schematics I have from this amp (from...
  25. goldswimmerb

    Marantz 2500 Schematic

    Hey guys, been looking around online and it seems that the manual scan doesn't have a complete schematic, and the schematic posted online is of low scan resolution. Is there a higher resolution scan of the schematic out there? I have one here where on phono 1 and 2 there's no audio, and it's...
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