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power amplifier

  1. J

    Marantz Model 140 – Single Filter Capacitor Revision? Both Channels Failed Simultaneously

    Hi everyone, I'm hoping someone here has run across this before because I'm starting to think my Model 140 is a production revision that doesn't match the commonly available service manual. I've been troubleshooting it methodically and trying to avoid replacing parts without evidence, but...
    • jammosherJAM
    • Thread
    • 140 marantz model 140 power amplifier service manual troubleshooting vintage audio
    • Replies: 36
    • Forum: Marantz Audio
  2. B

    Bose 551 spacial control reciver

    Doe's anyone know if pages 25 The power amplifier assembly pages is correct in regards to the emmitter side of Q425-Q431 .I have a conflict. Thanks in advance l am getting the wrong voltages on channel 1. I thought it would be the same configuration as channel 3. Thanks in advance.
  3. Jcandy

    JVC M-7050: restoration and revisions

    Hello all. I've finally started a JVC M-7050 restoration, and have decided to document the process here because I anticipate a long and challenging journey. The unit came from eBay and, luckily, was not damaged during shipping (in contrast to a JVC P-3030 received some weeks ago that was badly...
    • Jcandy
    • Thread
    • jvc m-7050 power amplifier restoration thread
    • Replies: 31
    • Forum: Solid State
  4. N

    Yamaha rx-a 1050 convert to power amp

    hi all first post here so please dont judge :) So im trying to convert a motherboard failed yamaha avr to a power amp just by using its transformer, amp boards and speaker terminal board ?( dont know the name of this board) all advise comes in handy . First question can i connect line in signal...
    • nikke92
    • Thread
    • amplifier avr diy power power amp power amplifier yamaha
    • Replies: 44
    • Forum: DIY
  5. T

    Sony ta-n80 channel blown, cause?

    I made a post a few hours ago about getting the bias correct on my ta-n80 amplifier. I ended up setting the bias after the amp had fully warmed up and everything seemed fine, it kept the bias well and didn't do anything weird. So after this I turn it off, go to test it and get no sound. I tried...
    • TrevorBarten
    • Thread
    • blown channel power amplifier repair sony es
    • Replies: 5
    • Forum: DIY
  6. F

    Accuphase P-266: replacing the NTC to limit the inrush current

    Hi everyone! I completely recapped the Accuphase P-266. Once the amplifier is on, it runs great! But charging 4x 22,000uF filter capacitors causes a high inrush current. Every time I first start it, the circuit breaker is trips because the inrush current is too high. This also happened before...
    • fox
    • Thread
    • accuphase ntc p-266 power amplifier relay
    • Replies: 6
    • Forum: Solid State
  7. quadmatrix82

    Marantz 250M - odd resistor values in circuit

    Hi all, so I have been doing some preventative maintenance on my Marantz 250M which seems to work well however I have noticed the left channel has many resistors that test low in circuit compared with the right channel - when tested out of circuit all these resistors measure fine. what could be...
  8. TunerLanding

    Amp and Preamp Separates (Mix or Match??)

    I'm looking to hear about other enthusiasts' experience with hooking up amps and preamps from different series or different manufacturers etc, as opposed to the matching designated pair. I've heard good things about putting a tube preamp with a powerful solid state amplifier for instance...
  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. polhem

    Upgrade from NAD 3020i

    I have used a NAD 3020i as my amp the latest 10 years. I have not found any amp that can match its details and treble. Though, since trying a NAD 319 dedicated power amp in my system I realise that the 3020i lacks definition and power in the lower frequencies. I wonder if anyone has a...
    • polhem
    • Thread
    • amplifier nad nad 3020 nad 3020i power amplifier upgrade
    • Replies: 10
    • Forum: Solid State
  11. B

    Altec A6 Power Amplifier Recommendations Please!!

    New user and first time poster here so go easy on me... ;) So, I have just bought some Altec A6's second hand in good condition. They came without a crossover so I am going to be using the Behringer CX3400 as an external crossover and horizontally bi-amp them, as I have heard people had good...
    • bgosling
    • Thread
    • altec a6 bi-amp crown external crossover power amplifier soundcraftsman
    • Replies: 0
    • Forum: The Lansing Legacy
  12. PROJECT 2501

    Making an ON OFF power switch for a Marantz model 32 amplifier

    HI, I have dozens and dozens of switches laying around of all different ratings and I was wondering what the ideal rating would be for voltage/amps for a on off power switch for a marantz model 32 power amplifier. Thanks
    • PROJECT 2501
    • Thread
    • diy marantz model 32 power amplifier power switch switch
    • Replies: 9
    • Forum: DIY
  13. A

    HMA-7500 user/operation manual

    Hi all, I just bought a Hitachi HMA-7500 mkI power amp, have looked on the usual sites, have downloaded the service manual but can't seem to track down the user manual. I know it's probably not really needed but I'd still like to have it. Does anyone have a PDF of one I could maybe get a copy...
    • AusDazz
    • Thread
    • hitachi hma-7500 power amplifier user manual
    • Replies: 0
    • Forum: Solid State
  14. tlite

    Do I want a QSC MX1500a Power Amp?

    I have the chance to get one or two of these for free from an old movie theater. https://www.qsc.com/resource-files/productresources/amp/discontinued/mxa/mx_1500a/q_amp_mxa_mx1500a_sepcs.pdf Just looking to add some dynamic range to my current setup. I currently have two integrated AVR's. A...
    • tlite
    • Thread
    • dynamic range mx 1500a power amplifier qsc
    • Replies: 9
    • Forum: Solid State
  15. Connor G

    Harman Kardon HK770 Thread

    Ever since restoring and listening to the Harman Kardon hk770, I have been an extremely avid proponent of them. I can't recommend them enough to people looking for a relatively cheap power amplifier that can drive efficient tower speakers, bookshelf speakers, and even headphones with ease...
  16. Z

    Luxman L510 power transistors

    Hi all, I'm trying to repair a Luxman L510, I've found that two of the four power transistors for one channel are damaged (short between B and C), it uses the 2SA1075 and 2SC2525 complementary pair, can someone suggest a recommended complementary pair, even in a different package? I can find...
    • zluca71
    • Thread
    • luxman power amplifier repair transistor
    • Replies: 10
    • Forum: Solid State
  17. S

    Has anybody tried building Stochino fast amplifier ?

    Hi, Iam trying to build an amplifier came across Stochino amplifier (attached circuit, improvised version and related documentation). Want to know if anyone has tried this earlier, if so how is the sound signature and overall performance. Also DIY gurus kindly analyze the circuit and suggest...
    • Suman
    • Thread
    • amplification mosfet power amplifier solidstate
    • Replies: 4
    • Forum: DIY
  18. A

    unusual power amplifier - DC offset etc

    Hi I'd appreciate some suggestions on an amp I'm working on. Works well, sounds good but there's some DC offset and no manual or schematics available. Background: The amp is made by an Australian business called Audio Assemblers Pty Ltd. Some of their stuff is reputed to be PA-grade but...
    • audiogymp
    • Thread
    • custom amplifier dc offset hifi modification power amplifier professional amp
    • Replies: 20
    • Forum: DIY
  19. BigRiver

    Sansui b-2102 Power Amp

    Anyone have experience with this power amp? Have the opportunity to pick one up for what seems like a good deal - about a buck fifty. Was told it was serviced a couple years ago, come to find that means a fuse was replaced, it was cleaned, and tested. In addition the description says one of...
  20. efrance45

    Adcom GFA 5500 - good buy?

    Hi all - I’ve been looking for a power amp upgrade for my ELAC B6s for a stereo listening setup and have come across and Adcom GFA 5500 for $150. I don’t have pictures yet but the seller says it works well, just a couple front panel bulbs burned out. Is this a good deal? He’s selling other...
  21. crazy-in-az

    B&K ST1400 II with distorted left channel

    I bought this amp about three weeks ago, and until last night it has been flawless. Last night I turned it on following the proper order of pre-amp first, then power amp. As soon as a I tried playing a record I could hear a fuzzy sound coming from the left speaker, and the volume was...
  22. lopezluna

    Need help identifying the value of this resistor please.

    Hello fellow AK'ers. I need help with this resistor value please. My eyes cant distinguish the color on one of the bands therefore I cant order the resistor. Any help would be greatly appreciated. I do have a picture of how to look up resistor values but I the problem is my eyes wont cooperate...
  23. PZimm

    Guidance DIY SS Power Amp

    I want to build a solid state power amp class a or ab utilizing DIY amp boards on EBay or other sources. I’m trying to not go too expensive on this as a lot of the purpose is to learn but ultimately have a respectable component for my system. Is there any guidance on matching a power supply and...
    • PZimm
    • Thread
    • diy power amp power amp power amplifier
    • Replies: 0
    • Forum: DIY
  24. K

    Nikko Alpha 230 In Protect Mode

    Title pretty much says it all. I purchased a nikko alpha 230 power amp off marketplace as is since it seemed to be in very good shape and not abused but when I tried to turn it on at home instantly the protect light went on. I checked visually if there were any burnt resistors and fuses but no...
    • Kevin6860
    • Thread
    • alpha 230 nikko power amplifier protect mode
    • Replies: 14
    • Forum: DIY
  25. M

    Is Yamaha s500 powerful enough for Cerwin Vega 12"?

    I have a pair of Cerwin Vegas 12", they're rated for 300 watts max and I am considering getting a Yamaha A-S500 to drive them. The Yamaha s500 is only rated for 85 watts x2 unfortunately. I'm looking for something below $500 in order to get decent sound quality and volume, ideally a Yamaha since...
    • Michaellll
    • Thread
    • clipping damage power amplifier receiver speakers yamaha
    • Replies: 5
    • Forum: Yamaha
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