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preamp

  1. goldswimmerb

    Marantz 3600 Restoration

    Figured I'd start posting the restorations/rebuilds that I am proud of here. I dont keep much of the equipment I get as I am happy with what I have and dont need a room full of marantz (though I'd like one). This 3600 came off of ebay, along with a 250M with a destroyed channel for $700 or so...
  2. joshvito

    Troubleshooting help needed.

    I built a single ended tube preamp (the circuit is here https://wtfamps.com/sofrito-preamplifier/). The preamp seems to be working great, however, my amplifier kicked into protection mode this evening. So, I decided to check to see if there was DC on the outputs of the preamp. I hooked up my...
    • joshvito
    • Thread
    • marantz preamp protection
    • Replies: 16
    • Forum: DIY
  3. efhjr

    Run a subwoofer with a C28?

    Could I use the main center output of my C28 to drive a subwoofer? I'm guessing I'd need to be able to adjust the subwoofer since the C28 won't let me control the output of that particular channel, right?
  4. C

    C34V with CR7 remote control- restore or trade/sell for newer model

    I bought a couple of months ago a C34V preamp with external remote control and a MCD7000 CD player. I just recently purchased a MC452 amp. When I hooked it all up, planning to use the preamp and CD player, I noticed the sound was not very clear. So, I switched the C34V out and started using a...
  5. kcline

    Early Version Fisher 400-C Preamp Owners Manual

    I have a Manual for the 400-C that is for the version that has dual-tone controls and shows the "Output Selector" as stereo reverse, stereo standard, channel a+b, channel b+a, channel a, channel b. Mine has single tone controls, then the output selector goes the same on the first two then...
    • kcline
    • Thread
    • fisher preamp tubes
    • Replies: 3
    • Forum: Fisher
  6. G

    Leave my preamp on or unplug?

    I bought a preamp but it has no off button is it okay to leave it on or should I unplug it when I'm not using it?
  7. Andyrlb

    LEAK TL12.1 mono valve power amp & pre

    My latest find is this apparently rather special Leak point one TL12.1 mono valve power amp and matching Rc/Pa remote control preamp. Untested and not used since 1979 . Totally original too and with all required cables .
    • Andyrlb
    • Thread
    • leak mono amps preamp valve amp
    • Replies: 6
    • Forum: Tube Audio
  8. M

    Kenwood KA880D channel dropouts

    Hi everyone. I am trying to restore an old 80's Kenwood amp. Model KA880D. It has issues with random loss of signal from either the left or right channel, moments where the volume suddenly drops and goes distorted. I was able to fix lets's say 50% of the drop outs, by resoldering the volume...
  9. G

    Bellari PA550 phono preamp

    What's you opinions? In all honesty I built a budget system and was going to buy the dj pre2 but found this PA550. Because I need the volume control its a convenient feature and about the only preamp I could find at a decent price with a volume knob, plus I thought it looked nice. I picked it...
  10. MKG

    Akitika PhonoZ build

    I’m really enjoying building kits. Each one teaches me a bit more about how and why circuits are designed as they are. I wish Heathkit was still around, but they were well before my time. I’ve tried multiple times to read books on theory and whatnot, but my brain doesn’t work that way- I learn...
    • MKG
    • Thread
    • akitika phono phonoz preamp
    • Replies: 38
    • Forum: DIY
  11. Mntdude1

    KENWOOD KA-7100 Phono Issue

    I have a refurbed KA-7100 that I want to move my Project RPM turntable to. But when I hook the turntable up to the Phono inputs, the sound is extremely low level dB wise. I was running the Project through a Jolida pre-amp into a Jolida tube amp. Maybe the wrong cartridge system. I tried using...
  12. rickl

    Basic C2 resto threads

    I recently picked up a C2 for my L-07M mono blocks. I can’t afford the L-07C matching preamp and found a C2 from a local AK member at a price I was willing to pay. I checked it out on the bench and it seemed to work. I hooked it up to my test system (Marantz 250/Infinity speakers/Sony...
  13. efhjr

    C28 + high-power amp = a whole lotta hiss

    Why does my C28 not play nice with contemporary high-powered amps? I connect, say, a 200wpc class-D amp and I get so much hiss I can't listen to music. And I am using shielded RCA cables between the pre and the amp. Then, when I replace the C28 with a Schiit SYS, all the hiss goes away...
    • efhjr
    • Thread
    • c28 hiss mcintosh preamp schiit sys
    • Replies: 47
    • Forum: McIntosh Audio
  14. Trekkie4

    A Plot Twist on LP120?

    Thought I'd share this interesting video from YouTube, made by the guy called "AkBKukU"... This actually raises some valid questions IMO... Because as you all know, one of the most commonly mentioned issues with LP120 was its integrated preamp. In fact, most people recommended to either yank...
  15. nickdinatale

    Gray Research 808A step up/equalizer?

    I've had this sitting around for a few months now and had never paid too much attention to it considering it's mono. It came with the broadcast turntable I own and was installed inside, but not being used. After spending all day yesterday wiring up a SUT box, it dawned on me that perhaps THIS is...
    • nickdinatale
    • Thread
    • 808a equalize gray preamp research step up transformer
    • Replies: 0
    • Forum: Turntables
  16. Stack

    Problems adjusting Preamp Offset, Power offset, Bias on Kenwood KA-801

    Hi, For those people wanting to attempt to calibrate their KA-801 or similar Kenwood machine after a recapping project, I wanted to document the troubles I faced and ask for advice on a few key points. A side note: for this project, you will need a multimeter. I used an early 2010s Radio...
    • Stack
    • Thread
    • amp bias dc offset ka-801 kenwood kenwood ka-801 preamp
    • Replies: 1
    • Forum: Solid State
  17. B

    Crown ic-150 low audio output issue

    Hey guys, I picked up a crown ic150 preamp that was extremely dirty on the outside , but very clean inside. I hooked it up and heard nothing at all until I turned the tuner/amp and the preamp to nearly max volume, but it's still very quiet. There is no visible issues with any of the caps (though...
  18. M

    Vincent Audio PHO-8 phono preamp for Ortofon 2M Blue

    Any comments? Numberwise they seem evenly matched. Is this a good match or not? Bit of a noob with phono preamps. Specs below for both the Vincent and the Ortofon: ORTOFON 2M BLUE Output voltage at 1000 Hz, 5cm/sec. - 5,5 mV Channel balance at 1 kHz - 1,5 dB Channel separation at 1 kHz...
    • Muji
    • Thread
    • ortofon 2m blue preamp vincent pho 8
    • Replies: 0
    • Forum: Turntables
  19. PROJECT 2501

    Which preamps go with the model 32?

    Im specifically looking for marantz preamps that are the same size, face plate color, and if necessary... Impedance compatible.. So far i know of the model 24 and 33 Speaking of the model 24... Same question but about tuners this time. Which tuners are the same size and color of the model 32...
  20. C

    Fisher 70rt Tuner Preamp Selenium Rectifier

    I have a nicely working fisher 70rt but I’m concerned about the selenium rectifier overheating. It plays fine so don’t want to mess with it if I don’t have to. I’ve replaced a selenium rectifier in a Dumont am fm tabletop radio with great success. However looking at the diagram for the fisher -...
    • Chris J
    • Thread
    • 70rt diode fisher preamp rectifier selenuim tube
    • Replies: 17
    • Forum: Tube Audio
  21. W

    Looking for preamp for MC2505

    About to buy restored C28 to match up with a MC2505, but now considering the C504. Different vintage, but I like the simplicity and the smaller size would be easier to work into my system. Any suggestions on best preamp to go with the MC2505? Thanks, wikksmith
  22. D

    New Elac Alchemy PPA-2 Phono Preamp - Any Users?

    The developer of the Alchemy product line is now working with Elac and has announced a new line of products. The PPA-2 phono preamp looks interesting. It's design is a fully discrete balanced JFET architecture. It has a nice feature set to include two sets of inputs, adjustable gain (MM/MC)...
  23. bfotk

    The horror of mono in stereo demonstrated

    Unless you have a dedicated mono cartridge, your vinyl playback system needs a switch somewhere to combine left and right channels into one. Here's why. mono vinyl played as if stereo (YUK): http://bit.ly/monoinstereo mono vinyl played in mono (AHH): http://bit.ly/monoinmono
    • bfotk
    • Thread
    • mono phono preamp stereo switch vinyl
    • Replies: 53
    • Forum: Turntables
  24. Mike Sweeney

    Has anyone replaced the pre-amp with this?

    https://www.muffsy.com/muffsy-pp4.html I saw where someone has replaced the preamp in an HK unit and I thought was an interesting idea for an upgrade for some of my 2200 series stuff. I really like the tunability of the preamp. Even if no, I might do it just because i can right now with the...
  25. noiselectro

    Can someone identify this mistery... ¿amp?

    Hello. I' just got this component, and I'm not sure if it's a radio, a preamp, or and amplifier. No brand name or model. Can someone identify it please? Thanks in advance for your replies.
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