power amplifier

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
  21. Connor G

    The Luxman M-4000 - An Absolute Unit!

    Hey everyone! I brought my M-4000 out from hiding to do some maintenance and cleaning. I haven't seen many HQ photos of the internals online, so I was more than happy to take some and share. These amplifiers are really something special. Everything oozes quality, from the beautiful VU meters, to...
  22. jscott_99

    Will a Cooling Fan Ruin/Blow a Yamaha M-80 or M-65

    Hi, I have no reason to NOT believe an audio technician, but he told me that running a cooling fan on top of a Yamaha M-80 power amplifier could short out the transistors because of the sensitivity of the bias transistors to air currents. Is this true? I'm asking because I like the thought of...
  23. rickl

    My new L-07M Kenwoods

    Not sure how this adventure into Kenwood started but just picked up a couple new to me L-07M amps today. Letting these warm up before I see how they sound.
  24. Kreshna

    Which power amplifier fits the following description?

    To many listeners, JBL 120Tis probably won''t pass as "reference speakers", but they are my reference speakers nonetheless. At least they allow me to recognize the difference between amplifiers. When driven by NAD C375BEE, for example, the bass sounds very strong and punchy, but they also sound...
  25. M

    Can I connect Pioneer sx-626 to Adcom power amp?

    Hey all I just picked up an Adcom GFA 5400 2 channel power amp from a thrift store for $5 dollars! Crazy cheap. Anyway it powers on but I cant fully know if it works till I hook it up. So, I am wonder if my Pioneer SX-626 can connect to it via its Pre-out/main in jacks that are jumpered...
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