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preamp

  1. Timothy Flath

    Nakamichi 630 Preamp/Tuner Restoration Project from Vintage System One

    Hello all. I noted there is really not much info out there on attempted restorations of the Nakamichi System One components. Thought I would start with the Nakamichi 630 combined Preamp/Tuner component. I recently aquired this system in trade for an amp I built and am tickled pink with how cool...
    • Timothy Flath
    • Thread
    • 630 nakamichi nakamichi 630 preamp recap restoration system one tuner
    • Replies: 4
    • Forum: DIY
  2. plavatar

    P2250 upgrade ideas and preamp recommendations?

    I upgraded from my AX-596 to a P2250 this weekend (using an HTR-5960 as a pre on both). So far, the P2250 is a big upgrade. Testing on my Polk Monitor 12 will continue tonight =) So. - Any mods I should know about? I dd a cursory search and google, but nothing jumped out at me besides the...
    • plavatar
    • Thread
    • mod p2250 preamp question
    • Replies: 5
    • Forum: Yamaha
  3. Benz

    What was done to this Dyna PAS (1)?

    Greetings, I just picked up a nice Dyna PAS + Dynakit ST-70 combo (my first tube gear, finally). Both units have been restored but I was wondering if the experts here could help me figure out what was done to the PAS as the previous owner wasn't a tech guy and only knew it had been restored when...
    • Benz
    • Thread
    • dynaco dynakit preamp tube
    • Replies: 41
    • Forum: Tube Audio
  4. I

    Marantz Model 2235B - humming after preamp restoration

    Hi all, I have a Marantz Model 2235B (first hand, from my father). It has been working forever, always been in a daily use. Lately I've noticed that the sound on the right speakers (Main and Remote) is lack of bass compared to the left side. I've decided to renew the required PCB and approached...
    • IFD
    • Thread
    • 2235b humming marantz preamp
    • Replies: 3
    • Forum: Marantz Audio
  5. H

    Yamaha C4 preamp fault. Hum. Phono switches.

    Have done a lot of work on this preamp and am starting a fresh thread because several faulty components have already been replaced or repaired and am hoping it may now be much easier to isolate and identify the problem. The issue: Hum is present on all inputs. -Playing vinyl on Phono 1 and 2...
    • Hifibythekg
    • Thread
    • earth ground hum hum noise preamp noise preamp yamaha yamaha c-4
    • Replies: 116
    • Forum: Yamaha
  6. N

    AU-999 Overhaul Oddity on Preamp Boards

    I have gotten through the recommended recaps (well, electrolytics only) and started on the resistors. When I went to add the 1 meg resistor there was already a little 47pF cap in the exact location where the 1M resistor was supposed to go. Someone had long ago pulled the subsonics and crowbars...
  7. cryptout

    16v AC for Tube preamplifier based on Musical Fidelity X-10D circuit?

    I just got a new preamp / tube buffer to play with. It came with a 12v AC wall-wart. Now I have a nice linear 16v AC PSU collecting dust and would like to use this instead of the wall-wart. I've plugged the 16v in and it works but I wonder if it's harmful to keep using it. If it is not...
    • cryptout
    • Thread
    • diy fix need advice preamp tube buffer
    • Replies: 23
    • Forum: Tube Audio
  8. grey_beard

    2226B Low Volume & Distortion Both Channels

    I have a 2226B that's new to me. It has low volume in both channels (and headphones) and distortion when the volume knob is turned up high (volume is still low through speakers and headphones). I've cleaned the pots and switched best I could without taking the board out and there's no...
  9. R

    Power Amp for 4 ELAC DBR-62 Speakers

    I am using a Marantz 1060 as a preamp and a Niles 2100 (2 channel) power amplifier to power 2 Elac DBR-62 speakers (100w 8 ohms). I'm adding 2 more Elac speakers and running them into my kitchen which is adjacent to the den where the Marantz/Niles are located. The Niles 2 channel power amp will...
  10. Mikhail

    Denon AVP-8000 no output from RCA to power amp

    Hi all, I recently picked up an AVP-8000 preamp from Denon and am flummoxed as to why the RCA outputs to the amplifier are not working. None of the outputs work except headphone which sounds amazing. No distortion, both channels work great. Yes it was a great deal and I figured since there...
    • Mikhail
    • Thread
    • avp-8000 denon preamp troubleshooting
    • Replies: 9
    • Forum: Solid State
  11. I

    White noise from tweeters when Hafler 915 is in chain

    I've been using a Raspberry Pi with a Khadas Tone Board DAC connected directly to my Hafler 9505 amp. I use LMS and this has worked out really well since I can change the volume from LMS. I wanted to have a bit more control over the bass & treble so I put a Hafler 915 preamp into the mix. With...
  12. CrazyFoot

    Building a system to make my speakers shine

    Hello all, I am just getting into the world of vintage audio and vinyl. I have been browsing past forums and hoping to tap your guys wealth of knowledge on a couple of setup questions I have. This time to build a set-up around my newly acquired Boston Acoustic A200's. This setup right now...
  13. Stack

    Kenwood KA-801 Phono Preamp Capacitive load: Please help me understand schematic

    Hi, I'm trying to determine the capacitive load for my Kenwood KA-801 preamp section (to see if I need to buy a preamp or modify the circuit to handle an AT-VM540ML cart), and I'm honestly in a bit over my head. I have the schematic of the preamp section but I'm not sure which caps would...
    • Stack
    • Thread
    • capacitive ka-801 kenwood load preamp
    • Replies: 4
    • Forum: Solid State
  14. sonduciel

    Denafrips Hestia/Hades/Thallo Thread

    I wanted to start this thread for people, like myself, interested in the amplifier offerings from Denafrips, mainly the Thallo power amplifier stacked with either the older Hestia pre-amplifier or the new Hades pre-amplifier. I have had the Hestia for about a year, and had it paired with the...
  15. docstu

    Preamp advice

    Happy New Year! After years of faithful service my Adcom 400 had developed an annoying intermittent buzz and the selector controls are getting temperamental. Im'm looking to replace it with something in the $1000-1500 or so range. I use a rebuilt Phase Linear 400, a Luxman 264 turntable and...
  16. E

    Little Advice needed

    Hi All So here is my question. I just had my Sansui 5000x professionally recapped and restored by Arnel Bautista. It is beautiful and ready for another 40 years. Highly recommend his work. I recently picked up a pair of ultra rare Sony ULM SS-7330 speakers that sound amazing. I am getting a...
  17. C

    Affordable phono preamp suggestions

    First off - Schitt Mani - the reigning affordable preamp champ on the review boards, isn't easily available to me here in Canada. So that one is out I'm afraid - unless you have a line on a retailer in Canada. I'm a vinyl hobbyist - but no audiophile. My last turntable was an entry level...
  18. tcdriver

    Does anyone use the microphone input on your Hi-Fi?

    A high impedance microphone input seemed to be pretty common in the early days of Hi-Fi, now, not so much. Does your equipment have this feature? Do you use the microphone input on your Hi-Fi? Example: Heathkit WA-P2 with MIC (Microphone) input
  19. H

    DC on a preamp rising and falling.

    DC offsrt on a preamp ranges from approx 10mV to 350mV, climbs and drops in a cycle that takes a minute or two to complete. (SM says it should be between 0 and 200mV.) How should I go about finding the cause of this? Freeze spray? Trimpots have just been replaced by Bourns, so it's not them...
  20. H

    Yamaha C4 - D.C. ranging 10mV- 350mV

    Finally got a C4! Working, sounds great straight away. However doing the adjustments, and even after installing Bourns trimpots, the DC on both channels ranges from approx 10mV to 350mV. Very steady rise and fall over the course of a minute or two. DC is rock steady at 35.2V Question: Is there a...
  21. mozcho

    Marantz 1060 as a Photo Stage and as a Preamp

    I have been connecting my turntable to the 1060 integrated amp. Lately there is a tube integrated Willsenton R8 offered to me at a very reasonable price. However, the R8 doesn't have phono in. I have two options: to use the 1060 as a pre to utilise the phono stage in it and feed it into the R8...
  22. LRVGTR

    Rack mountable pre-amplifiers

    I am having a tough time locating a rack-mountable pre-amp with digital inputs as well as balanced outputs. Am I way to picky or does a hi-if pre-amp like this exist? Any recommendations are appreciated. Thank you in advance! johnny
  23. Pretzelogic

    Jumpers on the back of Sansui 2000X and speaker pairing

    A good buddy gave me his ole Sansui 2000X. I had it completely rebuilt by an audio shop down by me and noticed when I was hooking up my speakers the jumpers in the back. Is that for using an external preamp? And if I wanted to do that would it sound good using a hybrid tube Shiit Vali2? Also I...
  24. rickl

    AR SP-4

    a friend asked me to look at his Audio Research SP-4. "It doesn't work". A quick search shows that @ConradH has posted thoughts and even a very nice resto page here. And searches on AK found another post from him. I brought it home and heard something rattling in it. That can't be good. Cap...
  25. EifX

    Finding a preamps for the Sumo Andromeda 2

    He there peoples of the Earth, I am a bit out of my league here, so be kind, please? My cousin asked me to find a preamp for his Sumo Andromeda 2. I had never heard of the beast, but when I stared it in the eyes on the interweb, I got very quiet. So I guess you guys and dolls just start...
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