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amp

  1. M

    Magnavox AstroSonic with 9300 amp

    Hello Audiokarma. I just picked up what I believe is a 1961 Magnavox AstroSonic record player with a "9304-10" amp. I have recapped most of the capacitors on this unit but I am hung up on the two .047 MFD capacitors in the amplifier. On my unit, one is 600WV and the other is 1600WV. I do...
    • MagnaZach
    • Thread
    • 9300 amp astro astrosonic capacitor magnavox sonic
    • Replies: 25
    • Forum: Tube Audio
  2. G

    80s or 90s Amp recommendations?

    Looking for recommendations for a replacement amp for my father’s separates system. It’s a late 80s Denon system all working very nicely, with an Arcam Alpha 2 amp that was specced with it from new. The amp sounds nice but it lacks a bit of ‘oomph’ - recapping it helped a bit but it’s still a...
  3. B

    Main and remote speakers not working together

    Day 1 newb here. I just set up an old Technics amp and connected some Sony speakers and a subwoofer to the 2 main and 2 remote speaker ports. I understand the intended use for these ports are for different rooms, and you wouldn't normally use both together, but I want to use them both. The issue...
  4. zastin17

    Dynaco ST-70, 1959, Freshly Drawn Hafler Schematic :)

    https://www.dropbox.com/s/k8bo95iab6bc9vu/Schematic_Dynaco St70 Final_2021-09-28.pdf?dl=0 I like to make older Schematic nice a "pretty" for my own archiving, but I rather share it, as maybe its still helpful today High quality PDF available above. Prints out very nice! This does not take me...
    • zastin17
    • Thread
    • 1959 amp dynaco halfer schematic st-70 tube
    • Replies: 4
    • Forum: Tube Audio
  5. MB2021

    NAD 7240PE - No sound to speakers, headphones very faint.

    Hello all, I have been reading up on this thread https://audiokarma.org/forums/index.php?threads/no-sound-from-nad-7240pe.756209 I have made some progress from when I first started out. The issue is that the amp went silent suddenly, no magic smoke, no popping sounds, nothing. It just crapped...
    • MB2021
    • Thread
    • 7240pe amp help nad nad 7240
    • Replies: 5
    • Forum: Solid State
  6. Reyhifi

    New family member a 1200

    I did it again, like Britney! I wasn’t looking, but I saw the ad. Became intrigued, some missing knobs one channel not working or working correctly. The current owner doesn’t know much, he got it as “payment “ from a former roommate. I’m sure, that I’ll have plenty of questions.
  7. K

    Need help identifying missing tubes for mystery amp

    Hello, I'm working on restoring this small power amp. It looks like it came form some sort of turntable console or something since it has plugs to switch the power, an extra a/c plug, and maybe power delivery for an a/c motor. It appears to be stereo and single ended for each side. The power...
    • kanurys
    • Thread
    • amp power poweramp stereo tube
    • Replies: 21
    • Forum: Tube Audio
  8. dave500

    Valve Amplification Company PA-45

    I acquired a VAC PA-45 amplifier set (amps & power supplies) in mint condition (gold & piano black finish). They operate flawlessly. The PA-45 is the 2-EL34 version of the PA-90 (4-EL34); they are monoblocks with separate power supplies. Does anyone have any information on them, or using a...
    • dave500
    • Thread
    • amp amplifier pa-45 pa-90 tube vac valve amplification company vintage
    • Replies: 3
    • Forum: Tube Audio
  9. C

    Right speaker channel, only tweeter working? Help!

    Hi all, This is my first post on the forum as I've recently got into vinyl after my other hand and I acquired a HiFi system from her late grandma. We're having an issue where only the tweeter is working on the right hand speaker when it's on turntable input. I've swapped the speakers over and...
  10. Pub Sub

    Seeking Help in Resurrecting my Kenwood KA-8100

    Hey all! Yesterday I bought a Kenwood KA-8100 that was advertised as broken. Today I need help in restoring it. The inside and outside of the unit are pretty darn clean. It appears as if one corner of the unit took a drop head on and bent but did a pretty good job of protecting the internals...
  11. cmarti

    Sansui AU-717 and AU-517

    How do you guys go about these amps that lack a 'Mono' switch? Do you just use a mono phono cart for records, but what about mono 8-tracks or cassettes? I still listen to a lot of mono music. What is everyone's consensus on this topic?
  12. U

    Could use some feedback. Considering a Hitachi SR-804

    I'm working on building out a vintage system primarily for vinyl listening. Maybe will connect something to do Bluetooth Tidal HiFi too. That might just be a side addition. The main purpose is for vinyl. Currently own: Ohm FRS-11s (Just picked these up and am super excited to actually use...
  13. Bryce in CZ

    Matching amp to multiple speakers

    Hi all, new here. Complete amateur to audio too. I can recognize a descending major or minor 6th within seconds, but electrical equations leave me clueless. That's why I'm asking for specific advice from one who understands it... I need to know how to buy a suitable receiver/amp (and speaker...
  14. W

    Suggestion for speaker/amp pairings and turntable

    Hello, I am new to this community, and am hoping to receive some advice and recommendations for upgrading my speakers, receiver and turntable. First off, I wanted to provide you with some background information on my current equipment and room dimensions. Speakers- Paradigm Performance Series-...
    • Wax4Daze
    • Thread
    • amp focal chora 826 monitor audio preamp receiver speakers
    • Replies: 36
    • Forum: Speakers
  15. Ziinda

    2x QSC 3500 amps no power up?

    I got 2 QSC series 3 3500 amps about 1 month ago and I ended up setting them up for home use connected through a dbx 2 way crossover. One for high and the low frequency. I had a set of speakers that I have been using for quite some time with other amps and have had favorable results no matter...
    • Ziinda
    • Thread
    • amp no lights no power up qsc series 3 3500
    • Replies: 15
    • Forum: Solid State
  16. S

    Optonica SM-4545 Amp causing LOUD constant buzz

    I've been using this integrated amp constantly for the past 8 years or so, and the other day out of the blue it started to emit a very loud and constant buzz. It deafens out anything else. I've isolated the amp, connected it with another speaker and confirmed it is the cause of the buzz. I...
  17. dilburt

    Meridian 557 Power Amp Issue

    I have a Meridian 557 that has been part of a Meridian stack I bought back in 1998 or so (502, 500, 566-24, 557). It's all performed flawlessly on a daily basis since last week when my 557 turned on then promptly turned itself back off. I removed all inputs and outputs and tested again with the...
  18. Stereoboy70

    Marantz 2216 amplifier board question

    Have a quick question for any Marantz gurus. I have a 2216 that had a blown right channel. Since I was replacing the output transistors I went ahead and totally rebuilt the board. New caps, new output transistors, new trim pots, new resistors at R735-R738. The transistors I used were as...
  19. radiotubes

    Crown A-30 mono tube amplifier EL37

    These are somewhat rare and not easy to evaluate. The A-30 30 stereo version appears on internet searches more frequently. My guess:$500-$800. Anyone ever see these sell or have an idea of value?
  20. bzowk

    JBL L100 Restoration

    Hey Guys - I'm planning on restoring my old JBL L100's that my father gave me long ago, but wife put me on a budget. I wish I had taken better care of them when younger as they are in rough shape and been through a lot. I'll definitely have to re-cone the woofers and refinish cabinets, but...
    • bzowk
    • Thread
    • amp dac jbl l100 re-cone recone restoration restore
    • Replies: 22
    • Forum: Speakers
  21. Mr.Brian

    New Tech needs help with Alamo Galaxie tube amp

    Hey fellas, hope I am posting this in the correct place. Just need a little help if possible. I have not been able to find a schematic for the Alamo Galaxie anywhere. I have heard one does not exist but I do have the Montclaire schematic which I have also been told is very close to the Galaxie...
    • Mr.Brian
    • Thread
    • alamo amp galaxie tube vintage
    • Replies: 13
    • Forum: Tube Audio
  22. M

    2 speakers 8ohm per channel; amp 4 or 8 ohm?

    Ls, I have decided to put 2 speakers on each front channel of my surround amp. They are both 8 Ohm so that should not fck up my stuff. The amp however has a switch that can be set to 4 or to 8 Ohms. What setting would be safer/better? As you can tell from my "indepth" knowledge I have been...
  23. iamConfusion

    hh scott a1600 info

    Hi anyone have any info / specs on the hh scott a1600 from the 80s? I’ve heard it’s abiut 150 watts per channel but dont know much else Thank you!
  24. Tuned

    Jolida 801 V4 & V5 Tubes not powering on

    I'm new to the forum and looking for some tips to help troubleshooting. I've had my Jolida 801 for about four years. It's worked great but today two of the tubes are not powering up. Ports V4 and V5. I put a basic multimeter on to check each tube ,as per the manual bias guide, and no voltage...
  25. Farducci

    CA610 II Protection Relay Slooooooooow

    Hey All, Looking at a CA610 II Amp for a friend as they said it's taking longer and longer to "turn on" as they use it. I've looked into it a bit and have noticed the protection relay does take about 2-3 minutes to activate with the power on, then the amp operates normally. Once warm, if I...
    • Farducci
    • Thread
    • amp ca610 capacitor protection relay slow cold start yamaha
    • Replies: 12
    • Forum: Yamaha
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